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SARS-CoV nucleocapsid protein binds to hUbc9, a ubiquitin conjugating enzyme of the sumoylation system.

Identifieur interne : 002080 ( PubMed/Corpus ); précédent : 002079; suivant : 002081

SARS-CoV nucleocapsid protein binds to hUbc9, a ubiquitin conjugating enzyme of the sumoylation system.

Auteurs : Zheng Fan ; Yue Zhuo ; Xinyu Tan ; Zhi Zhou ; Jiangang Yuan ; Boqin Qiang ; Jinghua Yan ; Xiaozhong Peng ; George F. Gao

Source :

RBID : pubmed:16998888

English descriptors

Abstract

SARS-CoV is a newly identified coronavirus (CoV) that causes severe acute respiratory syndrome (SARS). The SARS-CoV nucleocapsid (N) protein is an important structural and functional protein. To identify cellular proteins that interact with the SARS-CoV N protein and to elucidate the possible involvement of N protein in SARS-CoV pathogenesis, a human lymphocyte cDNA library was screened using a yeast two-hybrid system assay. hUbc9, a ubiquitin conjugating enzyme of sumoylation system, was found to interact specifically with the N protein, implying the post-translational sumoylation of the N protein. Mapping studies localized the critical N sequences for this interaction to amino acids 170-210, which includes the SR-rich motif. However, the consensus motif of sumoylation GK(62)EE in the N protein is not responsible for binding to hUbc9. Mutations of hUbc9 at the enzyme active site C93A or C93S severely impair the interaction with the N protein. The two proteins were also shown to colocalize in the cytoplasm of the transfected 293T cells. This is the first report demonstrating the interaction of hUbc9 with a structural protein of plus-strand RNA viruses, indicating a new drug target for SARS-CoV.

DOI: 10.1002/jmv.20707
PubMed: 16998888

Links to Exploration step

pubmed:16998888

Le document en format XML

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