9sv8

Herpes simplex virus 2 delta28-73 glycoprotein C ectodomain in complex with C3b

spinqualitylabelsall models 9sv8, resolution 3.56Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 9sv8 is a 3 chain structure with sequence from Homo sapiens and Human alphaherpesvirus 2. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3.56Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function GC_HHV2G Major attachment protein that mediates binding of the virus to cell surface heparan sulfate or chondroitin sulfate. Also plays a role in host immune evasion by inhibiting the host complement cascade activation (By similarity). Publication Abstract from PubMed The complement cascade is part of the first line of defence against viral infections, and many viruses have evolved to block it. For example, glycoprotein C (gC) from Herpes Simplex Virus 1 and 2 (gC1 and gC2) facilitates infection by modulating the complement cascade through an interaction with C3b. gC is also involved in attachment and other viral processes. However, our understanding of the molecular mechanisms of gC have been limited due to the absence of a structure. AlphaFold predicts that gC contains a disordered N-terminus and three immunoglobulin-like domains. Here, we generated various gC2 constructs and demonstrated that gC2 domains 1 and 2 are necessary and sufficient to interact with C3b and block the alternative pathway. A gC2 construct lacking the N-terminus in complex with C3b was characterised by cryo-EM at 3.6 A, providing the first structure for gC2, and revealing that the interaction is predominantly driven by gC2 domain 2 and the MG8 domain of C3b. This structure was confirmed by cross-linking mass spectrometry and by using C3b-blocking antibodies that recognised gC2 linear epitopes at the interface with C3b. Overall, the gC-C3b interaction is different from other C3b-interacting partners, providing a novel mechanism to regulate the complement cascade. Unveiling the unique interaction mechanism of herpes simplex virus 2 glycoprotein C with C3b.,Rojas Rechy MH, Atanasiu D, Hook LM, Cairns TM, Saw WT, Cahill A, Guo Z, Calabrese AN, Ranson NA, Friedman HM, Cohen GH, Fontana J bioRxiv [Preprint]. 2025 Oct 4:2025.10.04.680448. doi: 10.1101/2025.10.04.680448. PMID:41256425 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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