National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
F32GM145143
米国
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)
NS095892
米国
Wellcome Trust
221705/Z/20/Z
英国
引用
ジャーナル: Toxins (Basel) / 年: 2024 タイトル: Importance of the Cysteine-Rich Domain of Snake Venom Prothrombin Activators: Insights Gained from Synthetic Neutralizing Antibodies. 著者: Laetitia E Misson Mindrebo / Jeffrey T Mindrebo / Quoc Tran / Mark C Wilkinson / Jessica M Smith / Megan Verma / Nicholas R Casewell / Gabriel C Lander / Joseph G Jardine / 要旨: Snake venoms are cocktails of biologically active molecules that have evolved to immobilize prey, but can also induce a severe pathology in humans that are bitten. While animal-derived polyclonal ...Snake venoms are cocktails of biologically active molecules that have evolved to immobilize prey, but can also induce a severe pathology in humans that are bitten. While animal-derived polyclonal antivenoms are the primary treatment for snakebites, they often have limitations in efficacy and can cause severe adverse side effects. Building on recent efforts to develop improved antivenoms, notably through monoclonal antibodies, requires a comprehensive understanding of venom toxins. Among these toxins, snake venom metalloproteinases (SVMPs) play a pivotal role, particularly in viper envenomation, causing tissue damage, hemorrhage and coagulation disruption. One of the current challenges in the development of neutralizing monoclonal antibodies against SVMPs is the large size of the protein and the lack of existing knowledge of neutralizing epitopes. Here, we screened a synthetic human antibody library to isolate monoclonal antibodies against an SVMP from saw-scaled viper (genus ) venom. Upon characterization, several antibodies were identified that effectively blocked SVMP-mediated prothrombin activation. Cryo-electron microscopy revealed the structural basis of antibody-mediated neutralization, pinpointing the non-catalytic cysteine-rich domain of SVMPs as a crucial target. These findings emphasize the importance of understanding the molecular mechanisms of SVMPs to counter their toxic effects, thus advancing the development of more effective antivenoms.
超分子 #1: Ecarin in complex with neutralizing antibody H11
超分子
名称: Ecarin in complex with neutralizing antibody H11 / タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1, #3-#4, #2 詳細: Ecarin was complexed with H11 Fab, which was prepared by papain digestion of an IgG H11 antibody.
名称: Endogenous peptide / タイプ: protein_or_peptide / ID: 2 詳細: Either degradation product or co-purified with complex. Molecule was not added to the sample. コピー数: 1 / 光学異性体: LEVO
由来(天然)
生物種: Homo sapiens (ヒト)
分子量
理論値: 613.749 Da
組換発現
生物種: Homo sapiens (ヒト)
配列
文字列:
(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)
-
分子 #3: H11 Fab heavy chain
分子
名称: H11 Fab heavy chain / タイプ: protein_or_peptide / ID: 3 / コピー数: 1 / 光学異性体: LEVO
凍結剤: ETHANE / チャンバー内湿度: 100 % / チャンバー内温度: 4 K / 装置: FEI VITROBOT MARK IV
詳細
Sample was monodisperse but had preferred orientation on holey gold grids. Graphene grid was used to overcome preferred orientation and the two datasets were combined.