SNAP output for PDB entry 5u1c [SNAP web server]

PDB-id

5u1c; SNAP-derived features in text and JSON formats; DNAproDB

Class

viral protein

Method

cryo-EM (3.9 Å)

Summary

Structure of tetrameric hiv-1 strand transfer complex intasome

Reference

Passos DO, Li M, Yang R, Rebensburg SV, Ghirlando R, Jeon Y, Shkriabai N, Kvaratskhelia M, Craigie R, Lyumkis D (2017): "Cryo-EM structures and atomic model of the HIV-1 strand transfer complex intasome." Science, 355, 89-92. doi: 10.1126/science.aah5163.

Abstract

Like all retroviruses, HIV-1 irreversibly inserts a viral DNA (vDNA) copy of its RNA genome into host target DNA (tDNA). The intasome, a higher-order nucleoprotein complex composed of viral integrase (IN) and the ends of linear vDNA, mediates integration. Productive integration into host chromatin results in the formation of the strand transfer complex (STC) containing catalytically joined vDNA and tDNA. HIV-1 intasomes have been refractory to high-resolution structural studies. We used a soluble IN fusion protein to facilitate structural studies, through which we present a high-resolution cryo-electron microscopy (cryo-EM) structure of the core tetrameric HIV-1 STC and a higher-order form that adopts carboxyl-terminal domain rearrangements. The distinct STC structures highlight how HIV-1 can use the common retroviral intasome core architecture to accommodate different IN domain modules for assembly.