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1.
Prep Biochem Biotechnol ; 51(4): 375-385, 2021.
Article in English | MEDLINE | ID: mdl-32940546

ABSTRACT

Calotropis procera produces a milky sap containing proteolytic enzymes. At low concentrations, they induce milk-clotting (60 µg/ml) and to dehair hides (0.05 and 0.1%). A protocol for obtaining the enzymes is reported. The latex was mixed with distilled water and the mixture was cleaned through centrifugation. It was dialyzed with distilled water and centrifuged again to recover the soluble fraction [EP]. The dialyze is a key feature of the process. EP was characterized in terms of protein profile, chemical stability, among other criteria. Wild plants belonging to ten geographic regions and grown in different ecological conditions were used as latex source. Collections were carried out, spaced at three-month, according to the seasons at the site of the study. Proteolytic activity was measured as an internal marker and for determining stability of the samples. EP was also analyzed for metal content and microbiology. EP showed similar magnitude of proteolysis, chromatographic and electrophoretic profiles of proteins. Samples stored at 25 °C exhibited reduced solubility (11%) and proteolytic capacity (11%) after six months. Enzyme autolysis was negligible. Microbiological and metal analyses revealed standard quality of all the samples tested. EP induced milk clotting and hide dehairing after storage for up to six months.


Subject(s)
Aspartic Acid Endopeptidases/metabolism , Calotropis/enzymology , Chemistry Techniques, Analytical/standards , Ecosystem , Latex/chemistry , Plant Proteins/metabolism , Seasons , Animal Fur/drug effects , Animals , Aspartic Acid Endopeptidases/analysis , Aspartic Acid Endopeptidases/chemistry , Aspartic Acid Endopeptidases/pharmacology , Cattle , Goats , Hair Removal/methods , Latex/isolation & purification , Plant Proteins/analysis , Plant Proteins/chemistry , Plant Proteins/pharmacology , Proteolysis , Reference Standards , Solubility
2.
Environ Sci Pollut Res Int ; 25(22): 21459-21466, 2018 Aug.
Article in English | MEDLINE | ID: mdl-29297161

ABSTRACT

Most tanneries use high proportions of Na2S and CaO during the dehairing step, resulting in effluents of high alkalinity and large amounts of suspended solid, besides the risk of liberating the toxic H2S. Solid waste rich in protein is another environmental problem of tanneries. Enzymes are an interesting technological tool for industry due to their biodegradability, nontoxic nature, and nonpolluting effluent generation. In the leather industry, proteases have been chosen as a promising eco-friendly alternative to Na2S/CaO dehairing. Extracts with high proteolytic activity have been obtained from fruits of Bromeliaceae species: Bromelia balansae Mez (Bb), Bromelia hieronymi Mez (Bh), and Pseudananas macrodontes (Morr.) Harms (Pm). In this work, Bb, Bh, and Pm have been studied for application in the leather industry, focusing in their dehairing properties. Enzymatic activities were measured against collagen, keratin, elastin, and epidermis while a dehairing assay was performed by employing cowhide. All extracts showed similar activity on collagen and epidermis, while Bh and Pm were the most active against keratin at the same caseinolytic unit (CU) values; Bh was the only extract active against elastin. Bb (1 CU/ml), Bh (1.5 CU/ml), and Pm (0.5 CU/ml) were able to depilate cowhide. Desirable characteristics of dehairing were observed for all extracts since hair pores did not show residual hair, grain surface was clean and intact, and collagen fiber bundles of dermis were not damaged. In conclusion, results here presented show that proteolytic extracts of Bromeliaceae species are promising eco-compatible tools for leather industry.


Subject(s)
Bromelia/enzymology , Cysteine Proteases/isolation & purification , Hair/metabolism , Keratins/metabolism , Proteolysis , Animals , Bromeliaceae/enzymology , Cattle , Cysteine Proteases/metabolism , Fruit/enzymology , Peptide Hydrolases/metabolism , Skin/metabolism
3.
Planta ; 237(6): 1651-9, 2013 Jun.
Article in English | MEDLINE | ID: mdl-23568402

ABSTRACT

The latex from Vasconcellea quercifolia ("oak leaved papaya"), a member of the Caricaceae family, contains at least seven cysteine endopeptidases with high proteolytic activity, which helps to protect these plants against injury. In this study, we isolated and characterized the most basic of these cysteine endopeptidases, named VQ-VII. This new purified enzyme was homogeneous by bidimensional electrophoresis and MALDI-TOF mass spectrometry, and exhibited a molecular mass of 23,984 Da and an isoelectric point >11. The enzymatic activity of VQ-VII was completely inhibited by E-64 and iodoacetic acid, confirming that it belongs to the catalytic group of cysteine endopeptidases. By investigating the cleavage of the oxidized insulin B-chain to establish the hydrolytic specificity of VQ-VII, we found 13 cleavage sites on the substrate, revealing that it is a broad-specificity peptidase. The pH profiles toward p-Glu-Phe-Leu-p-nitroanilide (PFLNA) and casein showed that the optimum pH is about 6.8 for both substrates, and that in casein, it is active over a wide pH range (activity higher than 80 % between pH 6 and 9.5). Kinetic enzymatic assays were performed with the thiol peptidase substrate PFLNA (K m = 0.454 ± 0.046 mM, k cat = 1.57 ± 0.07 s(-1), k cat/K m = 3.46 × 10(3) ± 14 s(-1) M(-1)). The N-terminal sequence (21 amino acids) of VQ-VII showed an identity >70 % with 11 plant cysteine peptidases and the presence of highly conserved residues and motifs shared with the "papain-like" family of peptidases. VQ-VII proved to be a new latex enzyme of broad specificity, which can degrade extensively proteins of different nature in a wide pH range.


Subject(s)
Carica/enzymology , Cysteine Proteases/isolation & purification , Cysteine Proteases/metabolism , Latex/metabolism , Plant Proteins/isolation & purification , Plant Proteins/metabolism , Amino Acid Sequence , Carica/chemistry , Catalytic Domain , Cysteine Proteases/chemistry , Electrophoresis, Polyacrylamide Gel , Hydrogen-Ion Concentration , Insulin/metabolism , Kinetics , Mass Spectrometry , Molecular Sequence Data , Plant Proteins/chemistry , Proteolysis , Substrate Specificity , Titrimetry
4.
Planta ; 236(5): 1471-84, 2012 Nov.
Article in English | MEDLINE | ID: mdl-22790602

ABSTRACT

Vasconcellea quercifolia (Caricaceae) latex contains several cysteine endopeptidases with high proteolytic activity. Cysteine endopeptidases are the main active compounds used by the plant as a defense mechanism. A proteolytic preparation from V. quercifolia ("oak leaved papaya") latex was purified by cation exchange chromatography. From SDS-PAGE and blotting of the selected fractions, the N-terminal amino acid sequences of polypeptides were determined by Edman's degradation. The analysis by peptide mass fingerprinting (PMF) of the enzymes allowed their characterization and confirmed the presence of seven different cysteine proteinases in the latex of V. quercifolia. Moreover, the comparison between the tryptic maps with those deposited in databases using the MASCOT tool showed that none of the isolated proteases matched with another plant protease. Notably, a propeptidase was detected in the plant latex, which is being the first report in this sense. Furthermore, the cDNA of one of the cysteine proteases that is expressed in the latex of V. quercifolia was cloned and sequenced. The consensus sequence was aligned using the ClustalX web server, which allowed detecting a high degree of identity with cysteine proteases of the Caricaceae family and establishing the evolutionary relationship between them. We also observed a high conservation degree for those amino acid residues which are essential for the catalytic activity and tridimensional structure of the plant proteases belonging to the subfamily C1A. The PMF analysis strongly suggests that the sequence obtained corresponds to the VQ-III peptidase.


Subject(s)
Caricaceae/chemistry , Latex/metabolism , Peptide Hydrolases/chemistry , Peptide Hydrolases/metabolism , Amino Acid Sequence , Base Sequence , Caricaceae/metabolism , Cloning, Molecular , Conserved Sequence , Cysteine Proteases/chemistry , Cysteine Proteases/genetics , Cysteine Proteases/metabolism , Electrophoresis, Polyacrylamide Gel , Models, Molecular , Molecular Sequence Data , Peptide Hydrolases/isolation & purification , Peptide Mapping , Phylogeny , Plant Proteins/analysis , Plant Proteins/chemistry , Plant Proteins/metabolism , Protein Structure, Tertiary , Proteolysis
5.
Appl Biochem Biotechnol ; 165(2): 583-93, 2011 Sep.
Article in English | MEDLINE | ID: mdl-21584778

ABSTRACT

Fruits of Bromelia hieronymi, a tropical South American plant, possess a high content of peptidases with potential biotechnological uses. Total RNA was extracted from unripe fruits and peptidase cDNA was obtained by 3'RACE-PCR. The consensus sequence of the cysteine peptidase cDNA contained 875 bp, the 690 first ones codifying for a hypothetical polypeptide chain of the mature peptidase, named Bh-CP1 (molecular mass 24.773 kDa, pI 8.6, extinction molar coefficient 58,705 M(-1) cm(-1)). Bh-CP1 sequence shows a high percentage of identity with those of other cysteine plant proteases. The presence of highly preserved residues is observed, like those forming the catalytic site (Gln19, Cys25, His159, and Asn175, papain numbering), as well as other six Cys residues, involved in the formation of disulfide bounds. Molecular modeling results suggest the enzyme belongs to the α + ß class of proteins, with two disulfide bridges (Cys23-Cys63 and Cys57-Cys96) in the α domain, while the ß domain is stabilized by another disulfide bridge (Cys153-Cys203). Additionally, peptide mass fingerprints (PMFs) of the three peptidases previously isolated from B. hieronymi fruits (namely hieronymain I, II, and III) were performed and compared with the theoretical fingerprint of PMF of Bh-CP1, showing a partial matching between the in silico-translated protein and hieronymain II.


Subject(s)
Bromelia/enzymology , Conserved Sequence/genetics , Cysteine Endopeptidases/chemistry , Plant Proteins/chemistry , Proteomics/methods , Recombinant Proteins/chemistry , Amino Acid Sequence , Base Sequence , Catalytic Domain , Cloning, Molecular , Cysteine Endopeptidases/genetics , Cysteine Endopeptidases/isolation & purification , Escherichia coli , Fruit/enzymology , Models, Molecular , Molecular Sequence Data , Phylogeny , Plant Proteins/genetics , Plant Proteins/isolation & purification , Plasmids , Protein Structure, Secondary , Protein Structure, Tertiary , Recombinant Proteins/genetics , Recombinant Proteins/isolation & purification , Sequence Analysis, DNA , Sequence Homology, Amino Acid , Transformation, Bacterial
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