Mature HIV-1 capsid structure by cryo-electron microscopy and all-atom molecular dynamics.
Mature HIV-1 capsid structure by cryo-electron microscopy and all-atom molecular dynamics.
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DOI:
10.1038/nature12162
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发表时间:
2013-05-30
期刊:
影响因子:
64.8
通讯作者:
Zhang P
中科院分区:
文献类型:
--
作者:
Zhao G;Perilla JR;Yufenyuy EL;Meng X;Chen B;Ning J;Ahn J;Gronenborn AM;Schulten K;Aiken C;Zhang P
Retroviral capsid proteins are conserved structurally but assemble into different morphologies. The mature human immunodeficiency virus-1 (HIV-1) capsid is best described by a ‘fullerene cone’ model,, in which hexamers of the capsid protein are linked to form a hexagonal surface lattice that is closed by incorporating 12 capsid-protein pentamers. HIV-1 capsid protein contains an amino-terminal domain (NTD) comprising seven α-helices and a β-hairpin,, a carboxy-terminal domain (CTD) comprising four α-helices,, and a flexible linker with a 310-helix connecting the two structural domains. Structures of the capsid-protein assembly units have been determined by X-ray crystallography,; however, structural information regarding the assembled capsid and the contacts between the assembly units is incomplete. Here we report the cryo-electron microscopy structure of a tubular HIV-1 capsid-protein assembly at 8 Å resolution and the three-dimensional structure of a native HIV-1 core by cryo-electron tomography. The structure of the tubular assembly shows, at the three-fold interface, a three-helix bundle with critical hydrophobic interactions. Mutagenesis studies confirm that hydrophobic residues in the centre of the three-helix bundle are crucial for capsid assembly and stability, and for viral infectivity. The cryo-electron-microscopy structures enable modelling by large-scale molecular dynamics simulation, resulting in all-atom models for the hexamer-of-hexamer and pentamer-of-hexamer elements as well as for the entire capsid. Incorporation of pentamers results in closer trimer contacts and induces acute surface curvature. The complete atomic HIV-1 capsid model provides a platform for further studies of capsid function and for targeted pharmacological intervention.
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