Halocyntin and papillosin, two new antimicrobial peptides isolated from hemocytes of the solitary tunicate, Halocynthia papillosa

Richard Galinier (1) , E. Roger (1) , P.E. Sautière , A. Aumelas , B. Banaigs , G. Mitta (1)

1 BETM - Biologie et écologie tropicale et méditerranéenne [2007-2010]

We report here the screening of five marine invertebrate species from two taxa (tunicates and echinoderms) for the presence of cationic antimicrobial peptides (AMP) in defence cells (hemocytes). Antimicrobial activities were detected only in the two tunicatesMicrocosmus sabatieri andHalocynthia papillosa. In addition,we report the isolation and characterization of two novel peptides from H. papillosa hemocytes. Thesemolecules display antibacterial activity against Gram-positive and Gram-negative bacteria. Complete peptide characterization was obtained by a combination of Edman degradation and mass spectrometry. The mature molecules, named halocyntin and papillosin, comprise 26 and 34 amino acid residues, respectively. Their primary structure display no significant similarities with previously described AMP

Mots clés: tunicate; innate immunity; antimicrobial peptide

Domaines: Biodiversité et Ecologie

Richard Galinier, E. Roger, P.E. Sautière, A. Aumelas, B. Banaigs, et al.. Halocyntin and papillosin, two new antimicrobial peptides isolated from hemocytes of the solitary tunicate, Halocynthia papillosa. Journal of Peptide Science, 2009, 15 (1), pp.48-55. ⟨10.1002/psc.1101⟩. ⟨halsde-00371895⟩