National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35 GM131835
米国
引用
ジャーナル: Blood / 年: 2023 タイトル: Cryo-EM structures of human arachidonate 12S-lipoxygenase bound to endogenous and exogenous inhibitors. 著者: Jesse I Mobbs / Katrina A Black / Michelle Tran / Wessel A C Burger / Hariprasad Venugopal / Theodore R Holman / Michael Holinstat / David M Thal / Alisa Glukhova / 要旨: Human 12-lipoxygenase (12-LOX) is a key enzyme involved in platelet activation, and the regulation of its activity has been targeted for the treatment of heparin-induced thrombocytopenia. Despite the ...Human 12-lipoxygenase (12-LOX) is a key enzyme involved in platelet activation, and the regulation of its activity has been targeted for the treatment of heparin-induced thrombocytopenia. Despite the clinical importance of 12-LOX, the exact mechanisms by which it affects platelet activation are not fully understood, and the lack of structural information has limited drug discovery efforts. In this study, we used single-particle cryo-electron microscopy to determine high-resolution structures (1.7-2.8 Å) of human 12-LOX. Our results showed that 12-LOX can exist in multiple oligomeric states, from monomer to hexamer, which may affect its catalytic activity and membrane association. We also identified different conformations within the 12-LOX dimer, which likely represent different time points in its catalytic cycle. Furthermore, we identified small molecules bound to 12-LOX. The active site of the 12-LOX tetramer was occupied by an endogenous 12-LOX inhibitor, a long-chain acyl coenzyme A. In addition, we found that the 12-LOX hexamer can simultaneously bind to arachidonic acid and ML355, a selective 12-LOX inhibitor that has passed a phase 1 clinical trial for the treatment of heparin-induced thrombocytopenia and received a fast-track designation by the Food and Drug Administration. Overall, our findings provide novel insights into the assembly of 12-LOX oligomers, their catalytic mechanism, and small molecule binding, paving the way for further drug development targeting the 12-LOX enzyme.
解像度のタイプ: BY AUTHOR / 解像度: 2.3 Å / 解像度の算出法: OTHER / ソフトウェア - 名称: cryoSPARC 詳細: This is a composite map. The resolution (FSC 0.143) for the "open" subunit is 2.33, and for the "closed" subunit is 2.54 使用した粒子像数: 126914
初期 角度割当
タイプ: MAXIMUM LIKELIHOOD
最終 角度割当
タイプ: MAXIMUM LIKELIHOOD
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原子モデル構築 1
初期モデル
Chain - Source name: AlphaFold / Chain - Initial model type: in silico model
精密化
プロトコル: FLEXIBLE FIT
得られたモデル
PDB-8ghc: The structure of h12-LOX in dimeric form
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原子モデル構築 2
初期モデル
Chain - Source name: AlphaFold / Chain - Initial model type: in silico model
得られたモデル
PDB-8ghc: The structure of h12-LOX in dimeric form