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1.
J Asian Nat Prod Res ; 22(5): 496-502, 2020 May.
Article in English | MEDLINE | ID: mdl-31738087

ABSTRACT

Bistachybotrysin K (1), one new phenylspirodrimane dimer with a central 6/7 oxygen heterocycle core, was isolated from the fungus Stachybotrys chartarum CGMCC 3.5365. Its structure was elucidated by extensive spectroscopic data and single-crystal X-ray diffraction. Compound 1 showed significant cytotoxicity against human tumor cell lines HCT116, NCI-H460, BGC823, Daoy, and HepG2 with IC50 values in the range of 1.1-4.7 µM.


Subject(s)
Antineoplastic Agents , Spiro Compounds , Stachybotrys , Cell Line, Tumor , Humans , Molecular Structure
2.
J Asian Nat Prod Res ; 21(9): 887-894, 2019 Sep.
Article in English | MEDLINE | ID: mdl-30614271

ABSTRACT

Three new phenylspirodrimanes derivatives named stachybotrysins H and I (1 and 2) and stachybotrin E (3), together with one known compound stachybotrylactam (4), were isolated from Stachybotrys chartarum CGMCC 3.5365. Their structures were determined by extensive NMR data and mass spectroscopic analysis. Compounds 1 and 2 showed inhibitory effect towards potassium channel Kv1.3 with IC50 values of 13.4 and 10.9 µM, respectively.


Subject(s)
Kv1.3 Potassium Channel/antagonists & inhibitors , Spiro Compounds/chemistry , Stachybotrys/chemistry , Animals , CHO Cells , Cell Line , Cricetinae , Cricetulus
3.
PLoS Genet ; 12(7): e1006228, 2016 07.
Article in English | MEDLINE | ID: mdl-27472382

ABSTRACT

Pollen-stigma interactions are essential for pollen germination. The highly regulated process of pollen germination includes pollen adhesion, hydration, and germination on the stigma. However, the internal signaling of pollen that regulates pollen-stigma interactions is poorly understood. KINßγ is a plant-specific subunit of the SNF1-related protein kinase 1 complex which plays important roles in the regulation of plant development. Here, we showed that KINßγ was a cytoplasm- and nucleus-localized protein in the vegetative cells of pollen grains in Arabidopsis. The pollen of the Arabidopsis kinßγ mutant could not germinate on stigma, although it germinated normally in vitro. Further analysis revealed the hydration of kinßγ mutant pollen on the stigma was compromised. However, adding water to the stigma promoted the germination of the mutant pollen in vivo, suggesting that the compromised hydration of the mutant pollen led to its defective germination. In kinßγ mutant pollen, the structure of the mitochondria and peroxisomes was destroyed, and their numbers were significantly reduced compared with those in the wild type. Furthermore, we found that the kinßγ mutant exhibited reduced levels of reactive oxygen species (ROS) in pollen. The addition of H2O2 in vitro partially compensated for the reduced water absorption of the mutant pollen, and reducing ROS levels in pollen by overexpressing Arabidopsis CATALASE 3 resulted in compromised hydration of pollen on the stigma. These results indicate that Arabidopsis KINßγ is critical for the regulation of ROS levels by mediating the biogenesis of mitochondria and peroxisomes in pollen, which is required for pollen-stigma interactions during pollination.


Subject(s)
Arabidopsis Proteins/genetics , Germination/genetics , Mitochondria/genetics , Pollen/genetics , Pollination/genetics , Protein Serine-Threonine Kinases/genetics , Arabidopsis/genetics , Arabidopsis/growth & development , Arabidopsis Proteins/biosynthesis , Catalase/biosynthesis , Catalase/genetics , Flowers/genetics , Flowers/growth & development , Gene Expression Regulation, Plant/drug effects , Hydrogen Peroxide/pharmacology , Mutant Proteins/biosynthesis , Mutant Proteins/genetics , Peroxisomes/genetics , Pollen/growth & development , Protein Serine-Threonine Kinases/biosynthesis , Reactive Oxygen Species/metabolism , Water/metabolism
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