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Antibacterial proteins in rainbow trout, Oncorhynchus mykiss

Smith, V.J., Fernandes, J.M.O., Jones, S.J., Kemp, G.D., and Tatner, M.F. (2000) Antibacterial proteins in rainbow trout, Oncorhynchus mykiss. Fish and Shellfish Immunology, 10 (3). pp. 243-260. ISSN 1050-4648 (doi:10.1006/fsim.1999.0254)

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Abstract

Antibacterial proteins are an important part of the innate immune system for all animals. They have been extensively studied in mammals, amphibians and invertebrates, but have received only scant attention in fish. Their expression and processing, however, provide a way of monitoring defence vigour during development or with seasonal changes in physiology. The aim of the present work was to identify and characterise antibacterial proteins in rainbow trout. In vitro analyses of extracts of the peripheral blood leucocytes, head kidney leucocytes and mucus from adult unstimulated (non-immune) fish showed marked antibacterial activity against Gram positive bacteria. Fractionation by ion exchange chromatography and RP-HPLC of head kidney extracts showed the presence of two forms of lysozyme but no constitutively expressed antimicrobial proteins of <10 kDa. By contrast, chromatographic analyses of mucus revealed at least four antibacterial proteins. Two are conventional lysozymes, a third is an unusual lysozyme-like protein with a low isoelectric point, and the fourth is a highly hydrophobic, cationic peptide of c. 3 kDa.

Item Type:Article
Status:Published
Refereed:Yes
Glasgow Author(s):Tatner, Dr Mary
Authors: Smith, V.J., Fernandes, J.M.O., Jones, S.J., Kemp, G.D., and Tatner, M.F.
College/School:College of Medical Veterinary and Life Sciences > School of Life Sciences
Journal Name:Fish and Shellfish Immunology
ISSN:1050-4648
ISSN (Online):1095-9947
Published Online:25 March 2002

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