Consejo Nacional de Ciencia y Tecnologia (CONACYT)
773992
メキシコ
Engineering and Physical Sciences Research Council
EP/W524372/1
英国
Wellcome Trust
220628/Z/20/Z
英国
Wellcome Trust
221524/Z/20/Z
英国
Wellcome Trust
223810/Z/21/Z
英国
Wolfson Foundation
PR/jw/md/22597
英国
引用
ジャーナル: bioRxiv / 年: 2025 タイトル: Unveiling the unique interaction mechanism of herpes simplex virus 2 glycoprotein C with C3b. 著者: Moisés Hasim Rojas Rechy / Doina Atanasiu / Lauren M Hook / Tina M Cairns / Wan Ting Saw / Adam Cahill / Zilin Guo / Antonio N Calabrese / Neil A Ranson / Harvey M Friedman / Gary H Cohen / Juan Fontana / 要旨: 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 ...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 Å, 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.
全体 : Glycoprotein C of Herpes Simplex Virus, domains 1 and 2 with huma...
全体
名称: Glycoprotein C of Herpes Simplex Virus, domains 1 and 2 with human complement protein C3b.
要素
複合体: Glycoprotein C of Herpes Simplex Virus, domains 1 and 2 with human complement protein C3b.
複合体: Herpes simplex virus 2, delta28-73 glycoprotein C ectodomain
複合体: Complement human protein C3b
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超分子 #1: Glycoprotein C of Herpes Simplex Virus, domains 1 and 2 with huma...
超分子
名称: Glycoprotein C of Herpes Simplex Virus, domains 1 and 2 with human complement protein C3b. タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1-#3 詳細: Glycoprotein C has a deletion in the amino-acids 28-73
由来(天然)
生物種: Human alphaherpesvirus 2 (ヘルペスウイルス)
分子量
理論値: 180 KDa
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超分子 #2: Herpes simplex virus 2, delta28-73 glycoprotein C ectodomain
超分子
名称: Herpes simplex virus 2, delta28-73 glycoprotein C ectodomain タイプ: complex / ID: 2 / 親要素: 1 / 含まれる分子: #1 / 詳細: gC2 has a deletion in the amino-acids 28-73
由来(天然)
生物種: Human alphaherpesvirus 2 (ヘルペスウイルス)
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超分子 #3: Complement human protein C3b
超分子
名称: Complement human protein C3b / タイプ: complex / ID: 3 / 親要素: 1 / 含まれる分子: #2-#3 / 詳細: Chains A and B from complement protein C3b.
由来(天然)
生物種: Homo sapiens (ヒト)
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実験情報
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構造解析
手法
クライオ電子顕微鏡法
解析
単粒子再構成法
試料の集合状態
particle
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試料調製
緩衝液
pH: 7.4
凍結
凍結剤: ETHANE
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電子顕微鏡法
顕微鏡
TFS KRIOS
撮影
フィルム・検出器のモデル: FEI FALCON IV (4k x 4k) 平均電子線量: 46.0 e/Å2