TCB Publications - Abstract

Chuang Liu, Juan R. Perilla, Jiying Ning, Manman Lu, Guangjin Hou, Ruben Ramalho, Gregory Bedwell, In-Ja Byeon, Jinwoo Ahn, Jiong Shi, Angela Gronenborn, Peter Prevelige, Itay Rousso, Christopher Aiken, Tatyana Polenova, Klaus Schulten, and Peijun Zhang. Cyclophilin A stabilizes HIV-1 capsid through a novel non-canonical binding site. Nature Communications, 7:10714:(10 pages), 2016. (PMC: PMC4785225)

LIU2015 The host cell factor cyclophilin A (CypA) interacts directly with the HIV-1 capsid and regulates viral infectivity. Although the crystal structure of CypA in complex with the N-terminal domain of the HIV-1 capsid protein (CA) has been known for nearly two decades, how CypA interacts with the viral capsid and modulates HIV-1 infectivity remains unclear. We determined the cryoEM structure of CypA in complex with the assembled HIV-1 capsid at 8- resolution. The structure exhibits a distinct CypA-binding pattern in which CypA selectively bridges the two CA hexamers along the direction of highest curvature. EM-guided all-atom molecular dynamics simulations and solid-state NMR further reveal that the CypA-binding pattern is achieved by single-CypA molecules simultaneously interacting with two CA sub- units, in different hexamers, through a previously uncharacterized non-canonical interface. These results provide new insights into how CypA stabilizes the HIV-1 capsid and is recruited to facilitate HIV-1 infection.



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