Characteristics of the interferon regulatory factor pairs zfIRF5/7 and their stimulation expression by ISKNV Infection in zebrafish (Danio rerio).

Abstract:

:The interferon regulatory factor (IRF) family plays critical roles in a host's virus infection responses. In this study, two IRF family members, zfIRF5 and zfIRF7, are identified in zebrafish. The zfIRF5 protein encodes 297 amino acids without the carboxyl IRF3 domain. We suggest that zfIRF5 is a new kind of splicing variant, following the nine other kinds of IRF5 splicing variants found in mammals. The zfIRF7 protein is identified as a member of the IRF7 family, compared to the human IRF7 protein, the amino acid sequence of zfIRF7 only with 29% identity and devoid a virus activated domain (VAD). There zfIRF5/7 proteins are expressed in all 11 selective zebrafish tissues within 6-120h of embryonic development. Laser confocal microscopy shows that the full length the proteins are separately located in the cytoplasm. Mutation experiments show that the nuclear localization signals (NLS) of zfIRF7 and zfIRF-5 are at the N-terminal and C-terminals, respectively. In the assays, zfIRF7 expression increases during infectious spleen and kidney necrosis virus (ISKNV) infection and by poly(I:C) and LPS injections, both of which activate the transcriptional activity of L8G5-luc plasmids. The over-expression of zfIRF5/7 activates the interferon-stimulated response elements (ISRE) signal pathway. In addition, zfIRF7 can activate IFN-β, zfIRF5/7. Co-immunoprecipitation assays and laser co-confocal microscopy show that the two proteins could interact, and zfIRF7 may stimulate zfIRF5 to move into the nucleus. The co-expression of zfIRF5/IRF7 suppresses the transcriptional activities of IFN-β in HEK293T cells.

journal_name

Dev Comp Immunol

authors

Xiang Z,Dong C,Qi L,Chen W,Huang L,Li Z,Xia Q,Liu D,Huang M,Weng S,He J

doi

10.1016/j.dci.2010.07.003

subject

Has Abstract

pub_date

2010-12-01 00:00:00

pages

1263-73

issue

12

eissn

0145-305X

issn

1879-0089

pii

S0145-305X(10)00159-X

journal_volume

34

pub_type

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