PMID- 19217393 OWN - NLM STAT- MEDLINE DCOM- 20090427 LR - 20211020 IS - 0969-2126 (Print) IS - 1878-4186 (Electronic) IS - 0969-2126 (Linking) VI - 17 IP - 2 DP - 2009 Feb 13 TI - Structure of Epstein-Barr virus glycoprotein 42 suggests a mechanism for triggering receptor-activated virus entry. PG - 223-33 LID - 10.1016/j.str.2008.12.010 [doi] AB - Epstein-Barr virus requires glycoproteins gH/gL, gB, and gp42 to fuse its lipid envelope with B cells. Gp42 is a type II membrane protein consisting of a flexible N-terminal region, which binds gH/gL, and a C-terminal lectin-like domain that binds to the B-cell entry receptor human leukocyte antigen (HLA) class II. Gp42 triggers membrane fusion after HLA binding, a process that requires simultaneous binding to gH/gL and a functional hydrophobic pocket in the lectin domain adjacent to the HLA binding site. Here we present the structure of gp42 in its unbound form. Comparisons to the previously determined structure of a gp42:HLA complex reveals additional N-terminal residues forming part of the gH/gL binding site and structural changes in the receptor binding domain. Although the core of the lectin domain remains similar, significant shifts in two loops and an alpha helix bordering the essential hydrophobic pocket suggest a structural mechanism for triggering fusion. FAU - Kirschner, Austin N AU - Kirschner AN AD - Department of Biochemistry, Molecular Biology, and Cell Biology, Northwestern University, Evanston, IL 60208, USA. FAU - Sorem, Jessica AU - Sorem J FAU - Longnecker, Richard AU - Longnecker R FAU - Jardetzky, Theodore S AU - Jardetzky TS LA - eng GR - R01 CA117794/CA/NCI NIH HHS/United States GR - T32 AI060523/AI/NIAID NIH HHS/United States GR - R01 CA117794-02/CA/NCI NIH HHS/United States GR - R01 CA093444/CA/NCI NIH HHS/United States GR - R01 AI076183-06A2/AI/NIAID NIH HHS/United States GR - CA117794/CA/NCI NIH HHS/United States GR - R01 CA117794-01A1/CA/NCI NIH HHS/United States GR - 5 T32 GM008152/GM/NIGMS NIH HHS/United States GR - R01 CA117794-05/CA/NCI NIH HHS/United States GR - R01 CA117794-03/CA/NCI NIH HHS/United States GR - T32 GM008152/GM/NIGMS NIH HHS/United States GR - R01 AI076183-07/AI/NIAID NIH HHS/United States GR - R01 CA117794-04/CA/NCI NIH HHS/United States GR - R01 AI076183-09/AI/NIAID NIH HHS/United States GR - CA93444/CA/NCI NIH HHS/United States GR - R01 AI076183-08/AI/NIAID NIH HHS/United States GR - R01 AI076183/AI/NIAID NIH HHS/United States GR - R01 CA117794-06/CA/NCI NIH HHS/United States PT - Journal Article PT - Research Support, N.I.H., Extramural PL - United States TA - Structure JT - Structure (London, England : 1993) JID - 101087697 RN - 0 (HLA Antigens) RN - 0 (Membrane Glycoproteins) RN - 0 (Viral Proteins) SB - IM CIN - Structure. 2009 Feb 13;17(2):147-9. PMID: 19217384 MH - Animals MH - B-Lymphocytes/metabolism/virology MH - Binding Sites MH - CHO Cells MH - Cells, Cultured MH - Cricetinae MH - Cricetulus MH - HLA Antigens/*metabolism MH - Herpesvirus 4, Human/*chemistry/*physiology MH - Membrane Glycoproteins/chemistry/metabolism/physiology MH - Models, Biological MH - Models, Molecular MH - Protein Binding MH - Protein Conformation MH - Protein Interaction Domains and Motifs MH - Spodoptera MH - Viral Proteins/*chemistry/metabolism/physiology MH - *Virus Internalization PMC - PMC3085316 MID - NIHMS96458 EDAT- 2009/02/17 09:00 MHDA- 2009/04/28 09:00 PMCR- 2011/05/02 CRDT- 2009/02/17 09:00 PHST- 2008/09/15 00:00 [received] PHST- 2008/11/24 00:00 [revised] PHST- 2008/12/10 00:00 [accepted] PHST- 2009/02/17 09:00 [entrez] PHST- 2009/02/17 09:00 [pubmed] PHST- 2009/04/28 09:00 [medline] PHST- 2011/05/02 00:00 [pmc-release] AID - S0969-2126(09)00025-2 [pii] AID - 10.1016/j.str.2008.12.010 [doi] PST - ppublish SO - Structure. 2009 Feb 13;17(2):223-33. doi: 10.1016/j.str.2008.12.010.