Download MendeleyA bipartite structural organization defines the SERINC family of HIV-1 restriction factors.
Pye, V.E., Rosa, A., Bertelli, C., Struwe, W.B., Maslen, S.L., Corey, R., Liko, I., Hassall, M., Mattiuzzo, G., Ballandras-Colas, A., Nans, A., Takeuchi, Y., Stansfeld, P.J., Skehel, J.M., Robinson, C.V., Pizzato, M., Cherepanov, P.(2020) Nat Struct Mol Biol 27: 78-83
- PubMed: 31907454
- DOI: https://doi.org/10.1038/s41594-019-0357-0
- Primary Citation of Related Structures:
6SP2 - PubMed Abstract:
The human integral membrane protein SERINC5 potently restricts HIV-1 infectivity and sensitizes the virus to antibody-mediated neutralization. Here, using cryo-EM, we determine the structures of human SERINC5 and its orthologue from Drosophila melanogaster at subnanometer and near-atomic resolution, respectively. The structures reveal a novel fold comprised of ten transmembrane helices organized into two subdomains and bisected by a long diagonal helix. A lipid binding groove and clusters of conserved residues highlight potential functional sites. A structure-based mutagenesis scan identified surface-exposed regions and the interface between the subdomains of SERINC5 as critical for HIV-1-restriction activity. The same regions are also important for viral sensitization to neutralizing antibodies, directly linking the antiviral activity of SERINC5 with remodeling of the HIV-1 envelope glycoprotein.
Organizational Affiliation:
Chromatin Structure and Mobile DNA Laboratory, Francis Crick Institute, London, UK.
