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Title 

Hsp70 interacts with the retroviral restriction factor TRIM5α and assists the folding of TRIM5α

Authors 

Chae Young HwangJens HollDevi RajanYounglang LeeS KimM UmKi Sun KwonB Song

Publisher 

American Society for Biochemistry and Molecular Biology

Issue Date 

2010

Citation 

Journal of Biological Chemistry, vol. 285, no. 10, pp. 7827-7837

Keywords 

ATPase domainBinding partnersCatalytic activityCo-expressionCo-immunoprecipitation assaysColocalizationConcomitant decreaseDeletion mutantsHeat shock proteinHeat shock protein 70Human immunodeficiency virusMorphological changesOld worldsPhysiological functionsProtein complexesProteomicsRetroviral restrictionSoluble fractionTripartite motifs

Abstract 

Tripartite motif (TRIM) protein TRIM5α has been shown to restrict human immunodeficiency virus, type 1 infection in Old World monkey cells at the early post-entry step by poorly understood mechanisms. Currently, the physiological function of TRIM5α is not known. In this study, we showed that transiently overexpressed TRIM5α causes a morphological change in HEK293T cells. A proteomics analysis of the protein complexes that were pulled down with hemagglutinin-tagged TRIM5α suggested that the heat shock protein 70 (Hsp70) may serve as a TRIM5α-binding partner. The interaction between Hsp70 and TRIM5α was confirmed by co-localization and co-immunoprecipitation assays. Co-expression of Hsp70 reversed the TRIM5α-induced morphological change in HEK293T cells. Another heat shock protein Hsc70 also bound to TRIM5α, but unlike Hsp70, Hsc70 was not able to reverse the TRIM5α-induced morphological change, suggesting that Hsp 70 specifically reverses the morphological change caused by TRIM5α. Studies using a series of TRIM5α deletion mutants demonstrate that, although the PRYSPRY domain is critical for binding to Hsp70, the entire TRIM5α structure is necessary to induce the morphological change of cells. When the ATPase domain of Hsp70 was mutated, the mutated Hsp70 could not counteract the morphological change induced by TRIM5α, indicating that the catalytic activity of Hsp70 protein is important for this function. Co-expression of Hsp70 elevated the levels of TRIM5α in the detergent-soluble fraction with a concomitant decrease in the detergent-insoluble fraction. Together these results suggest that Hsp70 plays critical roles in the cellular management against the TRIM5α-induced cellular insults.

ISSN 

0021-9258

Link 

http://dx.doi.org/10.1074/jbc.M109.040618

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2019-05-02


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