Isolation and characterisation of two antimicrobial ...

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Title Isolation and characterisation of two antimicrobial peptides from haemocytes of the American lobster Homarus americanus
Author(s) Andrea L. Battison, Rachael Summerfield, Aleksander Patrzykat
Journal Fish & Shellfish Immunology
Date 2008
Volume 25
Issue 1-2
Start page 181
End page 187
Abstract Two antimicrobial peptides from haemocytes of the American lobster, Homarus americanus H. Milne Edwards 1837, were isolated and partially characterised - the first such description for this species. CAP-2, an approximately 12 kDa peptide, contained amino acid sequences corresponding to the predicted sequence for Hoa-crustin. Crustins are whey acidic protein (WAP) domain - containing peptides isolated from crustacean haemocytes. CAP-2 did not have any activity towards the Gram positive coccus Aerococcus viridans unlike carcinin, a crustin from Carcinus maenas haemocytes, which may partially explain the lobster's susceptibility to this bacterium. A second peptide, CAP-1, was a multimer composed of 4-6 kDa subunits with similarities to amphibian temporins. CAP-1 may represent a novel group of antimicrobial peptides for marine invertebrates and has been tentatively named 'homarin'. Homarin had bacteriostatic activity against some Gram negative bacteria and both protozoastatic and protozoacidal activity against two cultured scuticociliate parasites Mesanophrys chesapeakensis and Anophryoides haemophila, the latter a significant pathogen of H. americanus. (C) 2008 Elsevier Ltd. All rights reserved.
DOI 10.1016/j.fsi.2008.04.005 ER

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