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• W4311197627 abstract "Abstract The HIV-1 capsid houses the viral genome and interacts extensively with host cell proteins throughout the viral life cycle. It is composed of capsid protein (CA), which assembles into a conical fullerene lattice composed of roughly 200 CA hexamers and 12 CA pentamers. Previous structural analyses of individual CA hexamers and pentamers have provided valuable insight into capsid structure and function, but high-resolution information about these assemblies in the broader context of the capsid lattice is lacking. In this study, we combined cryo-electron tomography and single particle analysis cryo-electron microscopy to determine high-resolution structures of continuous regions of the capsid lattice containing both hexamers and pentamers. We also developed a new method of in vitro lattice assembly that enabled us to directly study the lattice under a wider range of conditions than has previously been possible. Using this approach, we identified a critical role for inositol hexakisphosphate (IP6) in pentamer formation and determined the structure of the CA lattice bound to the capsid-targeting antiretroviral drug GS-6207 (Lenacapvir). Our work reveals new structural details of the mature HIV-1 CA lattice and establishes the combination of lattice templating and single particle analysis as a robust strategy for studying retroviral capsid structure and capsid interactions with host proteins and antiviral compounds. Significance statement The mature HIV-1 capsid is composed of the capsid (CA) protein arranged in a conical lattice of hexamers and pentamers. Numerous structures of individual CA hexamers and pentamers alone have been published, but the molecular details of these assemblies in a more global, lattice-wide context are lacking. Here, we present high-resolution cryo-electron microscopy structures of continuous regions of the capsid lattice containing both hexamers and pentamers. We also describe key differences in the assembly and structures of these oligomers that have important implications for understanding retroviral maturation and for ongoing efforts to pharmacologically target the HIV-1 capsid." @default.
• W4311197627 created "2022-12-24" @default.
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• W4311197627 date "2022-12-02" @default.
• W4311197627 modified "2023-10-17" @default.
• W4311197627 title "Structural insights into HIV-1 polyanion-dependent capsid lattice formation revealed by single particle cryo-EM" @default.
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• W4311197627 doi "https://doi.org/10.1101/2022.12.02.518872" @default.
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