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Structural and biochemical studies of HCMV gH/gL/gO and pentamer reveal mutually exclusive cell entry complexes

Ciferri, Claudio and Chandramouli, Sumana and Danilo, Donnaruma and Nikitin, Pavel and Michael A., Cianfrocco and Gerrein, Rachel and Feire, Adam and Barnett, Susan and Lilja, Anders and Rappuoli, Rino and Nathalie , Norais and Settembre, Ethan and Carfi, Andrea (2015) Structural and biochemical studies of HCMV gH/gL/gO and pentamer reveal mutually exclusive cell entry complexes. Proceedings of the National Academy of Sciences of the United States of America, 112 (6). pp. 1767-1772. ISSN 1091-6490


Human cytomegalovirus (HCMV) is a major cause of morbidity and mortality in transplant patients and the leading viral cause of birth defects after congenital infection. The glycoprotein complexes gH/gL/gO and gH/gL/UL128/UL130/UL131A (Pentamer) are key targets of the human humoral response against HCMV and are required for HCMV entry into fibroblasts and endothelial/epithelial cells, respectively. We expressed and characterized soluble forms of gH/gL, gH/gL/gO, and Pentamer. Mass spectrometry and mutagenesis analysis revealed that gL-Cys144 forms disulfide bonds with gO-Cys351 in gH/gL/gO and with UL128-Cys162 in the Pentamer. Notably, Pentamer harboring the UL128-Cys162Ser/gL-Cys144Ser mutations had impaired syncytia formation and reduced interference of HCMV entry into epithelial cells. Electron microscopy analysis showed that HCMV gH/gL resembles HSV gH/gL and that gO and UL128/UL130/UL131A bind to the same site at the gH/gL N terminus. These data are consistent with gH/gL/gO and Pentamer forming mutually exclusive cell entry complexes and reveal the overall location of gH/gL-, gH/gL/ gO-, and Pentamer-specific neutralizing antibody binding sites. Our results provide, to our knowledge, the first structural view of gH/gL/ gO and Pentamer supporting the development of vaccines and antibody therapeutics against HCMV.

Item Type: Article
Keywords: GH/gL/gO HCMV Human cytomegalovirus Pentamer complex Virus entry
Date Deposited: 25 Nov 2017 00:45
Last Modified: 25 Jan 2019 00:45


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