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Ruiz, Nicolas; Wielgosz-Collin, Gaëtane; Poirier, Laurence; Grovel, Olivier; Petit, Karina Ethel; Mohamed-Benkada, Mustapha; du Pont, Thibaut Robiou; Bissett, John; Vérité, Philippe; Barnathan, Gilles; Pouchus, Yves François
Peptides (New York, N.Y. : 1980), 07/2007, Letnik: 28, Številka: 7Journal Article
A marine strain of Trichoderma longibrachiatum isolated from blue mussels ( Mytilus edulis) was investigated for short peptaibol production. Various 11-residue peptaibols, obtained as microheterogenous mixtures after a chromatographic fractionation, were identified by positive mass spectrometry fragmentation (ESI-IT-MS n, CID-MS n and GC/EI-MS). Thirty sequences were identified, which is the largest number of analogous sequences so far observed at once. Twenty-one sequences were new, and nine others corresponded to peptaibols already described. These peptaibols belonged to the same peptidic family based on the model Ac-Aib-xxx-xxx-xxx-Aib-Pro-xxx-xxx-Aib-Pro-xxol. They were named trichobrachin A when the residue in position 2 was an Asn, and trichobrachin C when it was a Gln. Major chromatographic sub-fractions, corresponding to purified peptaibols, were assayed for their cytotoxic activity. Trichobrachin A-IX and trichobrachin C exhibited the highest activities. There was an exponential relation between their relative hydrophobicity and their cytotoxicity on KB cells.
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