Structure of the rhesus monkey TRIM5? PRYSPRY domain, the HIV capsid recognition module.

ABSTRACT: Tripartite motif protein TRIM5? blocks retroviral replication after cell entry, and species-specific differences in its activity are determined by sequence variations within the C-terminal B30.2/PRYSPRY domain. Here we report a high-resolution structure of a TRIM5? PRYSPRY domain, the PRYSPRY of the rhesus monkey TRIM5? that potently restricts HIV infection, and identify features involved in its interaction with the HIV capsid. The extensive capsid-binding interface maps on the structurally divergent face of the protein formed by hypervariable loop segments, confirming that TRIM5? evolution is largely determined by its binding specificity. Interactions with the capsid are mediated by flexible variable loops via a mechanism that parallels antigen recognition by IgM antibodies, a similarity that may help explain some of the unusual functional properties of TRIM5?. Distinctive features of this pathogen-recognition interface, such as structural plasticity conferred by the mobile v1 segment and interaction with multiple epitopes, may allow restriction of divergent retroviruses and increase resistance to capsid mutations.

SUBMITTER: Biris N 

PROVIDER: S-EPMC3421187 | biostudies-literature | 2012 Aug

REPOSITORIES: biostudies-literature