期刊
FISH & SHELLFISH IMMUNOLOGY
卷 31, 期 6, 页码 1041-1050出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.fsi.2011.09.004
关键词
Gene duplication; Rainbow trout; RING finger; Ubiquitin E3 ligase; Viral hemorrhagic septicaemia virus
资金
- Mecklenburg-Vorpommern [AU 08 026]
- DFG, German Research Foundation [SE 326/16-1]
Ubiquitination regulates the activity, stability, and localization of a wide variety of proteins. Several mammalian MARCH ubiquitin E3 ligase proteins have been suggested to control cell surface immunoreceptors. The mitochondria! protein MARCH5 is a positive regulator of Toll-like receptor 7-mediated NF-KB activation in mammals. In the present study, duplicated MARCH5-like cDNA sequences were isolated from rainbow trout (Oncorhynchus mykiss) comprising open reading frames of 882 bp (MARCH5A) and 885 bp (MARCH56), respectively. Trout MARCH5A and MARCH5B-encoding sequences share only 65% sequence identity. Phylogenetic analyses including an additionally isolated MARCH5-like sequence from whitefish (Coregonus maraena) suggest that teleosts possess an additional MARCH5 gene copy resulting from a fish-specific whole genome duplication. Coding sequences of MARCH5A and MARCH5B genes from trout are distributed over six exons. Hypothetical MARCH5 proteins from trout comprise four transmembrane helices and a single motif similar to a RING variant domain (RINGv) including eight highly conserved cysteine and histidine residues. A 'reverse-northern blot' analysis revealed furthermore a MARCH56 6,exon5 transcript variant. Both MARCH5 genes from trout show a strain-, tissue- and cell-specific expression profile indicating different functional roles. Fishspecific MARCH5A gene for instance might be involved in defense mechanisms, since in vivo-challenge with the viral pathogen VHSV caused a significant 1.7-fold elevated copy number of the respective gene in gills four days after infection, whereas MARCH5B transcript level did not increase. (C) 2011 Elsevier Ltd. All rights reserved.
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