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1.
Bioorg Chem ; 146: 107288, 2024 May.
Article in English | MEDLINE | ID: mdl-38521013

ABSTRACT

Nitroimidazole compounds are well-known bioactive substances, and the structural activity relationship has been reported whereby the position of the nitro group within the imidazole ring has a large influence on the activity. This study focuses on synthesising new trypanocidal agents from the hybridisation of metronidazole with different natural phenols (eugenol, dihydroeugenol and guaiacol). Two different coupling methodologies have been explored in order to analyse the influence of the connector on bioactivity: i) classic direct esterification (AD compounds) and ii) "click" chemistry using a triazole connector (AC compounds). The in vitro trypanocidal tests show good results for both AC and AD hybrid compounds against both epimastigote and trypomastigote forms of T. cruzi. In silico studies showed positive data for most of the synthesised compounds and, in general present low toxicological risks. The AC compounds present lower ClogP (lipophilicity) values than those found for the AD series and higher TPSA (topological polar surface area) values, suggesting lower lipophilicity may be related to the presence of the triazole connector. The AD series compounds have higher Drug Score values than the AC series derivatives, suggesting better general properties for a pharmacological action.


Subject(s)
Chagas Disease , Trypanocidal Agents , Trypanosoma cruzi , Humans , Chagas Disease/drug therapy , Eugenol , Metronidazole/pharmacology , Metronidazole/therapeutic use , Structure-Activity Relationship , Triazoles/therapeutic use , Trypanocidal Agents/chemistry , Guaiacol/chemical synthesis , Guaiacol/chemistry , Guaiacol/pharmacology
2.
Sci Rep ; 14(1): 2198, 2024 01 25.
Article in English | MEDLINE | ID: mdl-38272996

ABSTRACT

Phenols, and especially their nitrated analogues, are ubiquitous pollutants and known carcinogens which have already been linked to forest decline. Although nitrophenols have been widely recognized as harmful to different aquatic and terrestrial organisms, we could not find any literature assessing their toxicity to terrestrial plants. Maize (monocot) and sunflower (dicot) were exposed to phenolic pollutants, guaiacol (GUA) and 4-nitroguaiacol (4NG), through a hydroponics system under controlled conditions in a growth chamber. Their acute physiological response was studied during a two-week root exposure to different concentrations of xenobiotics (0.1, 1.0, and 10 mM). The exposure visibly affected plant growth and the effect increased with increasing xenobiotic concentration. In general, 4NG affected plants more than GUA. Moreover, sunflower exhibited an adaptive response, especially to low and moderate GUA concentrations. The integrity of both plant species deteriorated during the exposure: biomass and photochemical pigment content were significantly reduced, which reflected in the poorer photochemical efficiency of photosystem II. Our results imply that 4NG is taken up by sunflower plants, where it could enter a lignin biosynthesis pathway.


Subject(s)
Environmental Pollutants , Environmental Pollutants/metabolism , Guaiacol/chemistry , Plants/metabolism
3.
Chem Biodivers ; 18(12): e2100650, 2021 Dec.
Article in English | MEDLINE | ID: mdl-34599795

ABSTRACT

6-Gingerol (1) is one of the major components in ginger and developing new synthetic methodologies could bring semisynthetic analogs with improved therapeutic properties. Towards this, multigram scale isolation of 6-gingerol with excellent purity was optimized using a simple and robust extraction, followed by column purification. Synthesis of 6-gingerdione, 7 from 6-gingerol was then achieved through selective -OTBDMS protection, DMP oxidation and deprotection reaction sequence for the first time. Compounds 1, 7 and 8 (dehydrozingerone) exhibited excellent cell-free antioxidant properties in DPPH, ABTS, superoxide radical scavenging assay and H2 O2 assay at 10-50 µM concentrations. The hemolytic study suggests that up to 50 µM, all three compounds did not exhibit toxicity to human erythrocytes. When H2 O2 treated zebrafish larvae groups (96hpf) were exposed to compounds 1, 7 and 8, it increases the SOD (19, 19.1 and 18.7 U/mg protein), CAT (18.1, 16.5, and 15.8 µmol/mg levels and decreases the lipid peroxidation level (13, 15 and 18 nmol/mg protein), respectively. In vivo ROS levels and degree of cell death were studied using DCFDA and Acridine orange assays. Compounds 1, 7 and 8 decreases the ROS and cell death level significantly. Taken together, compounds 1, 7 and 8 exhibit excellent antioxidant properties, counteract H2 O2 induced oxidative stress, reduces cell death in zebrafish larvae.


Subject(s)
Antioxidants/pharmacology , Catechols/pharmacology , Fatty Alcohols/pharmacology , Guaiacol/analogs & derivatives , Reactive Oxygen Species/metabolism , Animals , Antioxidants/chemical synthesis , Antioxidants/chemistry , Benzothiazoles/antagonists & inhibitors , Biphenyl Compounds/antagonists & inhibitors , Catechols/chemical synthesis , Catechols/chemistry , Cell Death/drug effects , Fatty Alcohols/chemical synthesis , Fatty Alcohols/chemistry , Zingiber officinale/chemistry , Guaiacol/chemical synthesis , Guaiacol/chemistry , Guaiacol/pharmacology , Humans , Hydrogen Peroxide/pharmacology , Oxidative Stress/drug effects , Picrates/antagonists & inhibitors , Sulfonic Acids/antagonists & inhibitors , Zebrafish
4.
Molecules ; 26(18)2021 Sep 21.
Article in English | MEDLINE | ID: mdl-34577171

ABSTRACT

As the human life expectancy increases, age-linked diseases have become more and more frequent. The worldwide increment of dementia cases demands medical solutions, but the current available drugs do not meet all the expectations. Recently the attention of the scientific community was attracted by natural compounds, used in ancient medicine, known for their beneficial effects and high tolerability. This review is focused on Ginger (Zingiber officinale) and explore its properties against Alzheimer's Disease and Vascular Dementia, two of the most common and devastating forms of dementia. This work resumes the beneficial effects of Ginger compounds, tested in computational in vitro and in vivo models of Alzheimer's Disease and Vascular Dementia, along with some human tests. All these evidences suggest a potential role of the compounds of ginger not only in the treatment of the disease, but also in its prevention.


Subject(s)
Dementia/drug therapy , Plant Extracts/chemistry , Protective Agents/chemistry , Zingiber officinale/chemistry , Catechols/chemistry , Catechols/pharmacology , Drug Discovery , Fatty Alcohols/chemistry , Fatty Alcohols/pharmacology , Guaiacol/analogs & derivatives , Guaiacol/chemistry , Guaiacol/pharmacology , Humans , Ketones/chemistry , Ketones/pharmacology , Models, Molecular , Plant Extracts/pharmacology , Protective Agents/pharmacology , Sesquiterpenes/chemistry , Sesquiterpenes/pharmacology , Structure-Activity Relationship
5.
Toxins (Basel) ; 13(6)2021 06 19.
Article in English | MEDLINE | ID: mdl-34205294

ABSTRACT

The co-occurrence of multiple mycotoxins, including aflatoxin B1 (AFB1), zearalenone (ZEN) and deoxynivalenol (DON), widely exists in cereal-based animal feed and food. At present, most reported mycotoxins degrading enzymes target only a certain type of mycotoxins. Therefore, it is of great significance for mining enzymes involved in the simultaneous degradation of different types of mycotoxins. In this study, a dye-decolorizing peroxidase-encoding gene BsDyP from Bacillus subtilis SCK6 was cloned and expressed in Escherichia coli BL21/pG-Tf2. The purified recombinant BsDyP was capable of oxidizing various substrates, including lignin phenolic model compounds 2,6-dimethylphenol and guaiacol, the substrate 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid), anthraquinone dye reactive blue 19 and azo dye reactive black 5, as well as Mn2+. In addition, BsDyP could efficiently degrade different types of mycotoxins, including AFB1, ZEN and DON, in presence of Mn2+. More important, the toxicities of their corresponding enzymatic degradation products AFB1-diol, 15-OH-ZEN and C15H18O8 were significantly lower than AFB1, ZEN and DON. In summary, these results proved that BsDyP was a promising candidate for the simultaneous degradation of multiple mycotoxins in animal feed and food.


Subject(s)
Bacillus subtilis/enzymology , Bacterial Proteins/chemistry , Coloring Agents/chemistry , Mycotoxins/chemistry , Peroxidase/chemistry , Anthraquinones/chemistry , Bacterial Proteins/genetics , Color , Escherichia coli/genetics , Guaiacol/chemistry , Manganese/chemistry , Naphthalenesulfonates/chemistry , Peroxidase/genetics , Recombinant Proteins/chemistry , Sulfonic Acids/chemistry , Thiazoles/chemistry , Xylenes/chemistry
6.
Angew Chem Int Ed Engl ; 60(31): 16906-16910, 2021 07 26.
Article in English | MEDLINE | ID: mdl-34057803

ABSTRACT

Demethylating methyl phenyl ethers is challenging, especially when the products are catechol derivatives prone to follow-up reactions. For biocatalytic demethylation, monooxygenases have previously been described requiring molecular oxygen which may cause oxidative side reactions. Here we show that such compounds can be demethylated anaerobically by using cobalamin-dependent methyltransferases exploiting thiols like ethyl 3-mercaptopropionate as a methyl trap. Using just two equivalents of this reagent, a broad spectrum of substituted guaiacol derivatives were demethylated, with conversions mostly above 90 %. This strategy was used to prepare the highly valuable antioxidant hydroxytyrosol on a one-gram scale in 97 % isolated yield.


Subject(s)
Guaiacol/metabolism , Mixed Function Oxygenases/metabolism , Sulfhydryl Compounds/metabolism , Biocatalysis , Demethylation , Guaiacol/chemistry , Mixed Function Oxygenases/chemistry , Molecular Structure , Sulfhydryl Compounds/chemistry
7.
Drug Dev Res ; 82(4): 605-615, 2021 06.
Article in English | MEDLINE | ID: mdl-33398901

ABSTRACT

In this article, we report the chemical synthesis of pyochelin-zingerone conjugate via a hydrolysable ester linkage for drug delivery as a "Trojan Horse Strategy." It is a new therapeutic approach to combat microbial infection and to address the issue of multi drug resistance in Gram-negative, nosocomial pathogen Pseudomonas aeruginosa. Pyochelin (Pch) is a catecholate type of phenolate siderophore produced and utilized by the pathogen P. aeruginosa to assimilate iron when colonizing the vertebrate host. Zingerone, is active component present in ginger, a dietary herb known for its anti-virulent approach against P. aeruginosa. In the present study, zingerone was exploited to act as a good substitute for existing antibiotics, known to have developed resistance by most pathogens. Encouraging results were obtained by docking analysis of pyochelin-zingerone conjugate with FptA, the outer membrane receptor of pyochelin. Conjugate also showed anti-quorum sensing activity and also inhibited swimming, swarming, and twitching motilities as well as biofilm formation in vitro.


Subject(s)
Anti-Bacterial Agents/chemical synthesis , Anti-Bacterial Agents/pharmacology , Guaiacol/analogs & derivatives , Phenols/pharmacology , Thiazoles/pharmacology , Biofilms/drug effects , Drug Design , Drug Resistance, Bacterial , Guaiacol/chemistry , Guaiacol/pharmacology , Microbial Sensitivity Tests , Molecular Docking Simulation , Molecular Structure , Phenols/chemistry , Pseudomonas aeruginosa/drug effects , Quorum Sensing , Thiazoles/chemistry
8.
BMC Complement Med Ther ; 21(1): 1, 2021 Jan 01.
Article in English | MEDLINE | ID: mdl-33386071

ABSTRACT

BACKGROUND: Hypercholesterolemia has posed a serious threat of heart diseases and stroke worldwide. Xanthine oxidase (XO), the rate-limiting enzyme in uric acid biosynthesis, is regarded as the root of reactive oxygen species (ROS) that generate atherosclerosis and cholesterol crystals. ß-Hydroxy ß-methylglutaryl-coenzyme A reductase (HMGR) is a rate-limiting enzyme in cholesterol biosynthesis. Although some commercially available enzyme inhibiting drugs have effectively reduced cholesterol levels, most of them have failed to meet potential drug candidates' requirements. Here, we have carried out an in-silico analysis of secondary metabolites that have already shown good inhibitory activity against XO and HMGR in a wet lab setup. METHODS: Out of 118 secondary metabolites reviewed, sixteen molecules inhibiting XO and HMGR were selected based on the IC50 values reported in in vitro assays. Further, receptor-based virtual screening was carried out against secondary metabolites using GOLD Protein-Ligand Docking Software, combined with subsequent post-docking, to study the binding affinities of ligands to the enzymes. In-silico ADMET analysis was carried out to explore their pharmacokinetic properties, followed by toxicity prediction through ProTox-II. RESULTS: The molecular docking of amentoflavone (GOLD score 70.54, ∆G calc. = - 10.4 Kcal/mol) and ganomycin I (GOLD score 59.61, ∆G calc. = - 6.8 Kcal/mol) displayed that the drug has effectively bound at the competitive site of XO and HMGR, respectively. Besides, 6-paradol and selgin could be potential drug candidates inhibiting XO. Likewise, n-octadecanyl-O-α-D-glucopyranosyl (6' → 1″)-O-α-D-glucopyranoside could be potential drug candidates to maintain serum cholesterol. In-silico ADMET analysis has shown that these sixteen metabolites were optimal within the categorical range compared to commercially available XO and HMGR inhibitors, respectively. Toxicity analysis through ProTox-II revealed that 6-gingerol, ganoleucoin K, and ganoleucoin Z are toxic for human use. CONCLUSION: This computational analysis supports earlier experimental evidence towards the inhibition of XO and HMGR by natural products. Further study is necessary to explore the clinical efficacy of these secondary molecules, which might be alternatives for the treatment of hypercholesterolemia.


Subject(s)
Fungi/chemistry , Hydroxymethylglutaryl-CoA Reductase Inhibitors/analysis , Phytochemicals/chemistry , Xanthine Oxidase/antagonists & inhibitors , Biflavonoids/chemistry , Computer Simulation , Drug Discovery , Guaiacol/analogs & derivatives , Guaiacol/chemistry , Hydroquinones/chemistry , Ketones/chemistry , Molecular Docking Simulation , Secondary Metabolism
9.
Neurochem Res ; 46(2): 252-264, 2021 Feb.
Article in English | MEDLINE | ID: mdl-33123873

ABSTRACT

Eugenol, a known vanilloid, was frequently used in dentistry as a local analgesic in addition, antibacterial and neuroprotective effects were also reported. Eugenol, capsaicin and many vanilloids are interacting with the transient receptor potential vanilloid 1 (TRPV1) in mammals and the TRPV1 is activated by noxious heat. The pharmacological manipulation of the TRPV1 has been shown to have therapeutic value. Caenorhabditis elegans (C. elegans) express TRPV orthologs (e.g. OCR-2, OSM-9) and it is a commonly used animal model system to study nociception as it displays a well-defined and reproducible nocifensive behavior. After exposure to vanilloid solutions, C. elegans wild type (N2) and mutants were placed on petri dishes divided in quadrants for heat stimulation. Thermal avoidance index was used to phenotype each tested C. elegans experimental groups. The results showed that eugenol, vanillin and zingerone can hamper nocifensive response of C. elegans to noxious heat (32-35 °C) following a sustained exposition. Also, the effect was reversed 6 h post exposition. Furthermore, eugenol and vanillin did not target specifically the OCR-2 or OSM-9 but zingerone did specifically target the OCR-2 similarly to capsaicin. Further structural and physicochemical analyses were performed. Key parameters for quantitative structure-property relationships (QSPR), quantitative structure-activity relationships (QSAR) and frontier orbital analyses suggest similarities and dissimilarities amongst the tested vanilloids and capsaicin in accordance with the relative anti-nociceptive effects observed.


Subject(s)
Analgesics/pharmacology , Avoidance Learning/drug effects , Benzaldehydes/pharmacology , Capsaicin/pharmacology , Eugenol/pharmacology , Guaiacol/analogs & derivatives , Analgesics/chemistry , Animals , Benzaldehydes/chemistry , Caenorhabditis elegans/drug effects , Caenorhabditis elegans Proteins/metabolism , Capsaicin/chemistry , Eugenol/chemistry , Guaiacol/chemistry , Guaiacol/pharmacology , Hot Temperature , Molecular Structure , Nerve Tissue Proteins/metabolism , Nociception/drug effects , Quantitative Structure-Activity Relationship , TRPV Cation Channels/metabolism
10.
Phys Chem Chem Phys ; 23(1): 320-328, 2021 Jan 06.
Article in English | MEDLINE | ID: mdl-33346267

ABSTRACT

Considering the remarkable applicability of ionic liquids (ILs) in bio-catalysis involving enzymes, herein, we report new IL based aqueous microemulsions as a catalytic reactor for cytochrome c (Cyt-c). Microemulsions (µEs), comprising water as the polar component, imidazolium (cation) and dioctylsulfosuccinate (AOT) (anion) based biamphiphilic ionic liquid (BAIL) as the surfactant and a hydrophobic ionic liquid (HIL) as the non-polar component have been prepared and characterized. The use of BAIL has promoted the formation of µEs without any co-surfactant, owing to its higher surface activity. The effect of ester- or amide-functionalization of the alkyl chain of the imidazolium cation of BAILs on the phase behavior of µEs has been investigated. The prepared µEs have been characterized via conductivity, dynamic light scattering (DLS), UV-vis absorption and steady-state fluorescence (using external polarity probes) techniques. The prepared µEs have been employed as nano-reactors for exploring the catalytic activity of Cyt-c. The formed BAIL-water nano-interfaces in reverse µEs have exerted a positive effect on the catalytic activity of Cyt-c stored in a water pool of reverse µEs. A five-fold higher rate constant in µEs as compared to buffer establishes µEs as a better catalytic medium. Furthermore, the differing nature of nano-interfaces created by BAILs and water in reverse µEs, depending on the functionalization of the alkyl chain of the cationic part of BAIL, has exerted varying influence on the catalytic activity of Cyt-c. It is expected that the present work will result in providing a versatile platform for the creation of new IL and water based µEs for bio-catalytic applications.


Subject(s)
Cytochromes c/chemistry , Emulsions/chemistry , Ionic Liquids/chemistry , Surface-Active Agents/chemistry , Animals , Catalysis , Dioctyl Sulfosuccinic Acid/chemistry , Guaiacol/chemistry , Horses , Hydrogen Peroxide/chemistry , Imidazoles/chemistry , Oxidation-Reduction , Water/chemistry
11.
PLoS One ; 15(12): e0244290, 2020.
Article in English | MEDLINE | ID: mdl-33347481

ABSTRACT

Traditional smoke flavours bear the risk of containing a multitude of contaminating carcinogenic side-products. Enzymatic decarboxylation of ferulic acid released from agro-industrial side-streams by ferulic acid esterases (FAE) enables the sustainable generation of pure, food grade 4-vinylguaiacol (4-VG), the impact compound of smoke flavour. The first basidiomycetous ferulic acid decarboxylase (FAD) was isolated from Schizophyllum commune (ScoFAD) and heterologously produced by Komagataella phaffii. It showed a molecular mass of 21 kDa, catalytic optima at pH 5.5 and 35°C, and a sequence identity of 63.6% to its next relative, a FAD from the ascomycete Cordyceps farinosa. The ScoFAD exhibited a high affinity to its only known substrate ferulic acid (FA) of 0.16 mmol L-1 and a turnover number of 750 s-1. The resulting catalytic efficiency kcat KM-1 of 4,779 L s-1 mmol-1 exceeded the next best known enzyme by more than a factor of 50. Immobilised on AminoLink Plus Agarose, ScoFAD maintained its activity for several days. The combination with FAEs and agro-industrial side-streams paves the way for a new generation of sustainable, clean, and safe smoke flavours.


Subject(s)
Flavoring Agents/chemical synthesis , Guaiacol/analogs & derivatives , Carboxy-Lyases/chemistry , Carboxy-Lyases/isolation & purification , Carboxy-Lyases/metabolism , Carboxylic Ester Hydrolases , Carcinogens , Cordyceps/metabolism , Coumaric Acids/chemistry , Flavoring Agents/chemistry , Guaiacol/chemical synthesis , Guaiacol/chemistry , Saccharomycetales/metabolism , Schizophyllum/metabolism
12.
Food Funct ; 11(11): 9892-9902, 2020 Nov 18.
Article in English | MEDLINE | ID: mdl-33094793

ABSTRACT

In this study, the effects of 6-paradol (6P) and 6-paradol-ß-glucoside (6PG) on neuritogenesis were investigated using PC12 cells. Treatment with 200 µM 6P or 6PG and nerve growth factor (NGF) (5 ng mL-1) increased the number of elongated dendritic cells 8.7 and 5.4 times, respectively, compared to that with NGF (5 ng mL-1) treatment alone. 6P and 6PG did not stimulate the phosphorylation of extracellular regulated protein kinases (ERK)1/2 and cAMP response element-binding protein (CREB) in the tropomyosin receptor kinase A (TrkA) pathway as their activities were suppressed by the pathway inhibitor, k252a. 6P enhanced Ca2+ influx into the cells, whereas 6PG had no effect on Ca2+ influx, although it stimulated PC12 cell differentiation. High-performance liquid chromatography (HPLC) analysis of 6PG in PC12 culture medium suggested that 6PG was deglycosylated to generate 6P, which exhibited the effect. Furthermore, the bioactivities of 6P and 6PG were investigated in mice, and the results revealed that they ameliorated short-term memory loss in animals during behavioral testing.


Subject(s)
Glucosides/administration & dosage , Guaiacol/analogs & derivatives , Ketones/administration & dosage , Memory Disorders/drug therapy , Plant Extracts/administration & dosage , Animals , Calcium/metabolism , Cyclic AMP Response Element-Binding Protein/genetics , Cyclic AMP Response Element-Binding Protein/metabolism , Glucosides/chemistry , Guaiacol/administration & dosage , Guaiacol/chemistry , Humans , Ketones/chemistry , Male , Memory/drug effects , Memory Disorders/genetics , Memory Disorders/metabolism , Memory Disorders/psychology , Mice , PC12 Cells , Phosphorylation , Rats , Receptor, trkA/genetics , Receptor, trkA/metabolism , Seeds/chemistry , Signal Transduction/drug effects , Zingiberaceae/chemistry
13.
Proc Natl Acad Sci U S A ; 117(41): 25771-25778, 2020 10 13.
Article in English | MEDLINE | ID: mdl-32989155

ABSTRACT

Cytochrome P450 enzymes have tremendous potential as industrial biocatalysts, including in biological lignin valorization. Here, we describe P450s that catalyze the O-demethylation of lignin-derived guaiacols with different ring substitution patterns. Bacterial strains Rhodococcus rhodochrous EP4 and Rhodococcus jostii RHA1 both utilized alkylguaiacols as sole growth substrates. Transcriptomics of EP4 grown on 4-propylguaiacol (4PG) revealed the up-regulation of agcA, encoding a CYP255A1 family P450, and the aph genes, previously shown to encode a meta-cleavage pathway responsible for 4-alkylphenol catabolism. The function of the homologous pathway in RHA1 was confirmed: Deletion mutants of agcA and aphC, encoding the meta-cleavage alkylcatechol dioxygenase, grew on guaiacol but not 4PG. By contrast, deletion mutants of gcoA and pcaL, encoding a CYP255A2 family P450 and an ortho-cleavage pathway enzyme, respectively, grew on 4-propylguaiacol but not guaiacol. CYP255A1 from EP4 catalyzed the O-demethylation of 4-alkylguaiacols to 4-alkylcatechols with the following apparent specificities (kcat/KM): propyl > ethyl > methyl > guaiacol. This order largely reflected AgcA's binding affinities for the different guaiacols and was the inverse of GcoAEP4's specificities. The biocatalytic potential of AgcA was demonstrated by the ability of EP4 to grow on lignin-derived products obtained from the reductive catalytic fractionation of corn stover, depleting alkylguaiacols and alkylphenols. By identifying related P450s with complementary specificities for lignin-relevant guaiacols, this study facilitates the design of these enzymes for biocatalytic applications. We further demonstrated that the metabolic fate of the guaiacol depends on its substitution pattern, a finding that has significant implications for engineering biocatalysts to valorize lignin.


Subject(s)
Bacterial Proteins/metabolism , Cytochrome P-450 Enzyme System/metabolism , Guaiacol/metabolism , Lignin/metabolism , Rhodococcus/enzymology , Bacterial Proteins/chemistry , Bacterial Proteins/genetics , Biocatalysis , Biodegradation, Environmental , Cytochrome P-450 Enzyme System/chemistry , Cytochrome P-450 Enzyme System/genetics , Guaiacol/chemistry , Kinetics , Lignin/chemistry , Rhodococcus/chemistry , Rhodococcus/genetics , Rhodococcus/metabolism , Substrate Specificity
14.
PLoS One ; 15(9): e0238509, 2020.
Article in English | MEDLINE | ID: mdl-32870935

ABSTRACT

Dendrobium bibenzyls and phenanthrenes such as chrysotoxine, cypripedin, gigantol and moscatilin have been reported to show promising inhibitory effects on lung cancer growth and metastasis in ex vivo human cell line models, suggesting their potential for clinical application in patients with lung cancer. However, it remains to be determined whether these therapeutic effects can be also seen in primary human cells and/or in vivo. In this study, we comparatively investigated the immune modulatory effects of bibenzyls and phenanthrenes, including a novel Dendrobium bibenzyl derivative, in primary human monocytes. All compounds were isolated and purified from a Thai orchid Dendrobium lindleyi Steud, a new source of therapeutic compounds with promising potential of tissue culture production. We detected increased frequencies of TNF- and IL-6-expressing monocytes after treatment with gigantol and cypripedin, whereas chrysotoxine and moscatilin did not alter the expression of these cytokines in monocytes. Interestingly, the new 4,5-dihydroxy-3,3',4'-trimethoxybibenzyl derivative showed dose-dependent immune modulatory effects in lipopolysaccharide (LPS)-treated CD14lo and CD14hi monocytes. Together, our findings show immune modulatory effects of the new bibenzyl derivative from Dendrobium lindleyi on different monocyte sub-populations. However, therapeutic consequences of these different monocyte populations on human diseases including cancer remain to be investigated.


Subject(s)
Bibenzyls/pharmacology , Dendrobium , Immunologic Factors/pharmacology , Monocytes/drug effects , Phenanthrenes/pharmacology , Plant Extracts/pharmacology , Benzyl Compounds/chemistry , Benzyl Compounds/pharmacology , Bibenzyls/chemistry , Cells, Cultured , Dendrobium/chemistry , Guaiacol/analogs & derivatives , Guaiacol/chemistry , Guaiacol/pharmacology , Humans , Immunologic Factors/chemistry , Monocytes/immunology , Naphthoquinones/chemistry , Naphthoquinones/pharmacology , Phenanthrenes/chemistry , Plant Extracts/chemistry
15.
Biotechnol Lett ; 42(12): 2711-2720, 2020 Dec.
Article in English | MEDLINE | ID: mdl-32761466

ABSTRACT

OBJECTIVE: The objective is to explore the effects of enhancing the activity of yeast ferulic acid decarboxylase (FDC1) on the level of 4-vinylguaiacol (4-VG) and the consumption of its precursor ferulic acid (FA) in top-fermented wheat beer. RESULTS: Expression of Bacillus pumilus FDC1 in brewer's yeast showed a better effect on the FDC1 activity than overexpression of the endogenous enzyme. The 4-VG content was increased by 34%, and the consumption time of FA was shortened from 48 to 12 h. Since the intracellular accumulation of the FDC1 substrate did not increase over time, to reduce the FA transport burden on cells and shorten the decarboxylation time, B. pumilus FDC1 was further secreted extracellularly. The resulted strain showed a 65% increase in 4-VG content in the FA-containing medium, and produced about 3 mg L-1 4-VG in the top-fermented wheat beer, increasing by 61% than control. However, further increasing the secretory expression level of FDC1 only accelerated FA consumption. CONCLUSIONS: These results suggested that appropriate secretion of bacterial FDC1 into wort could be used as a potential alternative strategy to increase the level of 4-VG in top-fermented wheat beer.


Subject(s)
Beer/microbiology , Carboxy-Lyases/genetics , Fermented Foods/microbiology , Guaiacol/analogs & derivatives , Bacillus pumilus/enzymology , Carboxy-Lyases/chemistry , Gene Expression Regulation/genetics , Guaiacol/chemistry , Saccharomyces cerevisiae/genetics , Saccharomyces cerevisiae/growth & development , Triticum/chemistry
16.
Biotechnol J ; 15(7): e1900571, 2020 Jul.
Article in English | MEDLINE | ID: mdl-32488970

ABSTRACT

Ferulic acid is a renewable chemical found in lignocellulose from grasses such as wheat straw and sugarcane. Pseudomonas putida is able to liberate and metabolize ferulic acid from plant biomass. Deletion of the hydroxycinnamoyl-CoA hydratase-lyase gene (ech) produced a strain of P. putida unable to utilize ferulic and p-coumaric acid, which is able to accumulate ferulic acid and p-coumaric acid from wheat straw or sugar cane bagasse. Further engineering of this strain saw the replacement of ech with the phenolic acid decarboxylase padC, which converts p-coumaric and ferulic acid into 4-vinylphenol and the flavor agent 4-vinylguaiacol, respectively. The engineered strain containing padC is able to generate 4-vinylguaiacol and 4-vinylphenol from media containing lignocellulose or Green Value Protobind lignin as feedstock, and does not require the addition of an exogenous inducer molecule. Biopolymerization of 4-vinylguaiacol and 4-vinylcatechol styrene products is also carried out, using Trametes versicolor laccase, to generate "biopolystyrene" materials on small scale.


Subject(s)
Lignin/metabolism , Metabolic Engineering/methods , Pseudomonas putida , Styrene , Biopolymers/chemistry , Biopolymers/metabolism , Coumaric Acids/chemistry , Coumaric Acids/metabolism , Guaiacol/analogs & derivatives , Guaiacol/chemistry , Guaiacol/metabolism , Pseudomonas putida/genetics , Pseudomonas putida/metabolism , Styrene/chemistry , Styrene/metabolism
17.
Food Chem ; 329: 127181, 2020 Nov 01.
Article in English | MEDLINE | ID: mdl-32502743

ABSTRACT

The compounds that the wood releases to the wine and the oxygen transmission rate (OTR) of the barrel define the final wine. The new possibility of choosing the OTR of the barrel allows the winemaker to globally control the ageing process. The aim of this work was to study the volatile composition of woods classified according to their OTR, which are used to build barrels for wine ageing. The results showed that volatile composition differs depending on wood OTR and the temperature reached during toasting. On the toasted side of the stave in contact with the wine, low OTR wood had a statistically higher content in furan compounds (5-hydroxymethylfurfural, furfural and 5-methylfurfural), acetovanillone and phenolic aldehydes (vanillin and syringaldehyde), while 4-ethylguaiacol and trans-ß-methyl-γ-octalactone were significantly higher in staves with a high OTR. The same red wine aged first for three months in high and low oxygenation barrels presents different characteristics.


Subject(s)
Food Handling/methods , Oxygen/chemistry , Quercus/chemistry , Volatile Organic Compounds/chemistry , Wine/analysis , Benzaldehydes/chemistry , Chromatography, Gas , Discriminant Analysis , Furans/chemistry , Guaiacol/chemistry , Temperature , Wood/chemistry
18.
Molecules ; 25(12)2020 Jun 22.
Article in English | MEDLINE | ID: mdl-32580521

ABSTRACT

Passiflora maliformis is an introduced plant in Australia but its flowers are known to attract the native Jarvis's fruit fly, Bactrocera jarvisi (Tryon). The present study identifies and quantifies likely attractant(s) of male B. jarvisi in P. maliformis flowers. The chemical compositions of the inner and outer coronal filaments, anther, stigma, ovary, sepal, and petal of P. maliformis were separately extracted with ethanol and analyzed using gas chromatography-mass spectrometry (GC-MS). Polyisoprenoid lipid precursors, fatty acids and their derivatives, and phenylpropanoids were detected in P. maliformis flowers. Phenylpropanoids included raspberry ketone, cuelure, zingerone, and zingerol, although compositions varied markedly amongst the flower parts. P. maliformis flowers were open for less than one day, and the amounts of some of the compounds decreased throughout the day. The attraction of male B. jarvisi to P. maliformis flowers is most readily explained by the presence of zingerone in these flowers.


Subject(s)
Flowers/chemistry , Guaiacol/analogs & derivatives , Passiflora/chemistry , Tephritidae/physiology , Animals , Australia , Behavior, Animal/drug effects , Female , Gas Chromatography-Mass Spectrometry , Guaiacol/chemistry , Guaiacol/isolation & purification , Male , Pheromones/chemistry
19.
ChemMedChem ; 15(13): 1187-1199, 2020 07 03.
Article in English | MEDLINE | ID: mdl-32368837

ABSTRACT

Myeloperoxidase (MPO) is known to cause oxidative stress and inflammation leading to cardiovascular disease (CVD) complications. MPO-mediated oxidation of lipoproteins leads to dysfunctional entities altering the landscape of lipoprotein functionality. The specificity of guaiacol derivatives toward preventing MPO-mediated oxidation to limit MPO's harmful effects is unknown. Diligent in silico studies were accomplished for a portfolio of compounds with guaiacol as a building block. The compounds' activity toward MPO inhibition was also validated. The role of these chemical entities in controlling MPO-mediated oxidation of lipoproteins (LDL and HDL) was shown to agree with our approach of developing powerful MPO inhibitors. The mechanism of MPO inhibition was demonstrated to be reversible in nature. This study reveals that there is great potential for guaiacol derivatives as therapeutics for CVD by modulating lipid profiles, reducing atherosclerotic plaque burden, and subsequently optimizing cardiovascular functions.


Subject(s)
Antioxidants/pharmacology , Atherosclerosis/drug therapy , Cardiovascular Diseases/drug therapy , Enzyme Inhibitors/pharmacology , Guaiacol/pharmacology , Peroxidase/antagonists & inhibitors , Animals , Antioxidants/chemical synthesis , Antioxidants/chemistry , Atherosclerosis/metabolism , Benzothiazoles/antagonists & inhibitors , Biphenyl Compounds/antagonists & inhibitors , Cardiovascular Diseases/metabolism , Cell Survival/drug effects , Cells, Cultured , Dose-Response Relationship, Drug , Enzyme Inhibitors/chemical synthesis , Enzyme Inhibitors/chemistry , Guaiacol/chemical synthesis , Guaiacol/chemistry , Humans , Interleukin-1beta/antagonists & inhibitors , Interleukin-1beta/genetics , Lipopolysaccharides/antagonists & inhibitors , Lipopolysaccharides/pharmacology , Mice , Molecular Docking Simulation , Molecular Structure , Peroxidase/metabolism , Picrates/antagonists & inhibitors , RAW 264.7 Cells , Structure-Activity Relationship , Sulfonic Acids/antagonists & inhibitors , Tumor Necrosis Factor-alpha/antagonists & inhibitors , Tumor Necrosis Factor-alpha/genetics
20.
J Recept Signal Transduct Res ; 40(4): 324-338, 2020 Aug.
Article in English | MEDLINE | ID: mdl-32223496

ABSTRACT

Toll-like receptor 4 (TLR4) pathway is one of the major pathways that mediate the inflammation in human body. There are different anti-inflammatory drugs available in the market which specifically act on different signaling proteins of TLR4 pathway but they do have few side effects and other limitations for intended use in human body. In this study, Curcumin and its different analogs have been analyzed as the inhibitors of signaling proteins, i.e. Cycloxygenase-2 (COX-2), inhibitor of kappaß kinase (IKK) and TANK binding kinase-1 (TBK-1) of TLR4 pathway using different computational tools. Initially, three compounds were selected for respective target based on free binding energy among which different compounds were reported to have better binding affinity than commercially available drug (control). Upon continuous computational exploration with induced fit docking (IFD), 6-Gingerol, Yakuchinone A and Yakuchinone B were identified as the best inhibitors of COX-2, IKK, and TBK-1 respectively. Then their drug-like potentialities were analyzed in different experiments where they were also predicted to perform well. Hopefully, this study will uphold the efforts of researchers to identify anti-inflammatory drugs from natural sources.


Subject(s)
Computational Chemistry , Curcumin/chemistry , Inflammation/drug therapy , Toll-Like Receptor 4/chemistry , Catechols/chemistry , Catechols/isolation & purification , Catechols/therapeutic use , Curcumin/analogs & derivatives , Curcumin/isolation & purification , Curcumin/therapeutic use , Cyclooxygenase 2/genetics , Diarylheptanoids/chemistry , Diarylheptanoids/isolation & purification , Diarylheptanoids/therapeutic use , Fatty Alcohols/chemistry , Fatty Alcohols/isolation & purification , Fatty Alcohols/therapeutic use , Guaiacol/analogs & derivatives , Guaiacol/chemistry , Guaiacol/isolation & purification , Guaiacol/therapeutic use , Humans , I-kappa B Kinase/genetics , Inflammation/genetics , Lipopolysaccharides/chemistry , NF-kappa B/antagonists & inhibitors , NF-kappa B/genetics , Pharmaceutical Preparations/chemistry , Protein Serine-Threonine Kinases/genetics , Signal Transduction/drug effects , Toll-Like Receptor 4/antagonists & inhibitors , Toll-Like Receptor 4/genetics
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