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, 01 M formic acid at 0.3 mL/min over 70 min (2) Gradient 2: from 10% CH3CN-..% 0.01 M formic acid to 50% CH3CN-50% 0.01 M formic acid at 0.3 mL/min over 70 min, % 0.01 M formic acid to 60% CH3CN-40% 0, p.80

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, Les cyanobactéries sont reconnues pour produire principalement des lipopeptides cycliques, contenant des acides aminés non-protéinogéniques. Les voies de biosynthèses de ce type de composé font intervenir différentes classes d'enzymes multifonctionnelles, tels que les NRPS (Non Ribosomal Peptide Synthetases) responsables de la modification d'acide aminé en configuration D, N-methylé, ?-hydroxylé ou déshydratés. Les PKS (PolyKetide Synthetases), parfois associé avec d'autres enzymes tels que les FAAL (Fatty Acyl-AMP ligase), sont impliqués dans la formation et l'insertion d'acide gras ?-aminé. Les laxaphycines sont une famille de lipopeptides cycliques contenant des acides aminés non-protéinogéniques tel qu'un acide gras ?-aminé et des acides aminés D et sont divisé en deux sous familles. Les peptides de la sous familles des laxaphycines A contiennnent onze acides aminé tandis que les laxaphycines B présentent un cylce à douze résidues. Ces métabolites secondaires sont produits par différentes espèces de cyanobactéries telles que Anabaena cf torulosa, Caractérisations des laxaphycines Les organismes marins sont une source importante de métabolites secondaires pouvant jouer un rôle écologique, en étant toxiques ou répulsifs, et possédant des activités biologiques diverses tels qu'antibactériennes, anti-tumorales ou anti-fongiques

, étant séquestrés ou biotransfomés, mais également de déterminer leurs activités tant pharmacologiques qu'écologiques

S. Bien-que-considéré-comme-un-spécialiste-dans-la-litterature, striatus consomme différentes cyanobactéries et semble se comporter comme les lièvres de mer généralistes du genre Aplysia. B. orientalis, collecté sur L. majuscula, ne montre pas non plus un comportement généraliste en consommant sans contraintes les métabolites secondaires de la cyanobactérie A. cf torulosa dans les expériences de choix de nourriture. La façon dont S. striatus manipule une variété de métabolites secondaires en les séquestrant et les biotransformant montre qu'il est capable de s'adapter à des sources de nourriture variées

G. De-manière, Cependant nous pouvons suggérer que les espèces généralistes, tel que S. striatus, peuvent s'habituer à consommer une proie, éduquer leur sens de perceptions et ainsi être capable de repérer à distance cette source de nourriture qui peut également lui fournir un abri. D'autre part, une espèce généraliste peut montrer une préférence pour une source de nourriture et se rabattre sur une nourriture alternative en cas d'absence de la première. Dans notre modèle, A. cf torulosa pourrait être une nourriture de substitution pour S. striatus mais peut également être un avantage adaptatif pour S. striatus afin d'éviter la prédation de G. ceylonica et T. coerulipes, aucune interaction entre cyanobactérie et herbivores spécialistes n'a été observé, l'association de plusieurs espèces dans les efflorescences et leur éphémérité pouvant en être la raison

, L'absence de ses prédateurs sur d'autres producteurs primaires suggère que les métabolites secondaires régissent des interactions plus complexes

, L'écologie chimique marine est encore a ses débuts mais la médiation chimique dans les écosystèmes marins est souvent sous estimée. Des molécules clés peuvent en effet régir