Mapping of Chikungunya virus interactions with host proteins identified nsP2 as a highly connected viral component.

Abstract:

:Chikungunya virus (CHIKV) is a mosquito-transmitted alphavirus that has been responsible for an epidemic outbreak of unprecedented magnitude in recent years. Since then, significant efforts have been made to better understand the biology of this virus, but we still have poor knowledge of CHIKV interactions with host cell components at the molecular level. Here we describe the extensive use of high-throughput yeast two-hybrid (HT-Y2H) assays to characterize interactions between CHIKV and human proteins. A total of 22 high-confidence interactions, which essentially involved the viral nonstructural protein nsP2, were identified and further validated in protein complementation assay (PCA). These results were integrated to a larger network obtained by extensive mining of the literature for reports on alphavirus-host interactions. To investigate the role of cellular proteins interacting with nsP2, gene silencing experiments were performed in cells infected by a recombinant CHIKV expressing Renilla luciferase as a reporter. Collected data showed that heterogeneous nuclear ribonucleoprotein K (hnRNP-K) and ubiquilin 4 (UBQLN4) participate in CHIKV replication in vitro. In addition, we showed that CHIKV nsP2 induces a cellular shutoff, as previously reported for other Old World alphaviruses, and determined that among binding partners identified by yeast two-hybrid methods, the tetratricopeptide repeat protein 7B (TTC7B) plays a significant role in this activity. Altogether, this report provides the first interaction map between CHIKV and human proteins and describes new host cell proteins involved in the replication cycle of this virus.

journal_name

J Virol

journal_title

Journal of virology

authors

Bouraï M,Lucas-Hourani M,Gad HH,Drosten C,Jacob Y,Tafforeau L,Cassonnet P,Jones LM,Judith D,Couderc T,Lecuit M,André P,Kümmerer BM,Lotteau V,Desprès P,Tangy F,Vidalain PO

doi

10.1128/JVI.06390-11

subject

Has Abstract

pub_date

2012-03-01 00:00:00

pages

3121-34

issue

6

eissn

0022-538X

issn

1098-5514

pii

JVI.06390-11

journal_volume

86

pub_type

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