Anti-HIV cyclotides from the Chinese medicinal herb Viola yedoensis.
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ABSTRACT:
SUBMITTER: Wang CK
PROVIDER: S-EPMC6327322 | biostudies-literature | 2008 Jan
REPOSITORIES: biostudies-literature
Publications
Anti-HIV cyclotides from the Chinese medicinal herb Viola yedoensis.
Wang Conan K L CK Colgrave Michelle L ML Gustafson Kirk R KR Ireland David C DC Goransson Ulf U Craik David J DJ
Journal of natural products 20071215 1
Cyclotides are macrocyclic plant peptides characterized by a knotted arrangement of three disulfide bonds. They display a range of interesting bioactivities, including anti-HIV and insecticidal activities. More than 100 different cyclotides have been isolated from two phylogenetically distant plant families, the Rubiaceae and Violaceae. In this study we have characterized the cyclotides from Viola yedoensis, an important Chinese herb from the Violaceae family that has been reported to contain po ...[more]
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2024-11-10 | GSE281536 | GEO
Project description:Cyclotides are a family of plant-derived peptides characterized by a ~30 amino acid cyclic backbone and a cystine knot motif. Cyclotides have diverse bioactivities, and in particular their cytotoxicity has attracted significant attention for its potential anti-cancer applications. Hybanthus enneaspermus is a medicinal herb widely used in India as a natural libido enhancer, and a previous study indicated that it may contain cyclotides. In the current study, 11 novel cyclotides and one known cyclotide (cycloviolacin O2) were identified and isolated from H. enneaspermus. Their sequences were determined using tandem MS, and NMR analysis of six of these cyclotides indicates their three-dimensional structures are similar to those of other known cyclotides. The most abundant cyclotide in this plant, hyen D, has comparable cytotoxicity against cancer cells to cycloviolacin O2, the most cytotoxic cyclotide discovered so far. Herein we provide a mechanistic insight into the mode-of-action of the novel cyclotides’ cytotoxicity. Hyen D, E, L, M, and cycloviolacin O2 preferentially interacted with model lipid membranes containing phospholipids with phosphatidylethanolamine-headgroups, as measured by surface plasmon resonance. Cyclotide-membrane interactions correlated with cytotoxicity, suggesting that membrane binding underpins cytotoxicity. Overall, this study helps broaden knowledge on the indigenous Indian herb H. enneaspermus, and reports the discovery of novel cyclotides with potent anti-cancer activity.
2020-05-13 | PXD017924 | Pride
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