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Structural basis of membrane binding by Gla domains of vitamin K-dependent proteins

机译:维生素K依赖蛋白的Gla结构域结合膜的结构基础

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In a calcium-dependent interaction critical for blood coagulation, vitamin K dependent blood coagulation proteins bind cell membranes containing phosphatidylserine via gamma-carboxyglutamic acid rich (Gla) domains. Gla domain mediated protein-membrane interaction is required for generation of thrombin, the terminal enzyme in the coagulation cascade, on a physiologic time scale. We determined by X-ray crystallography and NMR spectroscopy the lysophosphatidylserine-binding site in the bovine prothrombin Gla domain. The serine head group binds Gla domain bound calcium ions and Gla residues 17 and 21, fixed elements of the Gla domain fold, predicting the structural basis for phosphatidylserine specificity among Gla domains. Gla domains provide a unique mechanism for protein-phospholipid membrane interaction. Increasingly Gla domains are being identified in proteins unrelated to blood coagulation. Thus, this membrane-binding mechanism may be important in other physiologic processes. [References: 45]
机译:在对血液凝固至关重要的钙依赖性相互作用中,维生素K依赖性血液凝固蛋白通过富含γ-羧基谷氨酸的(Gla)结构域结合含有磷脂酰丝氨酸的细胞膜。在生理学时间尺度上,Gla结构域介导的蛋白膜相互作用对于凝血酶(凝血级联反应中的末端酶)的产生是必需的。我们通过X射线晶体学和NMR光谱确定了牛凝血酶原Gla结构域中的溶血磷脂酰丝氨酸结合位点。丝氨酸头部基团结合Gla结构域结合的钙离子和Gla残基17和21,Gla结构域的固定元件折叠,从而预测Gla结构域中磷脂酰丝氨酸特异性的结构基础。 Gla结构域为蛋白质-磷脂膜相互作用提供了独特的机制。在与血液凝固无关的蛋白质中越来越多地发现了Gla结构域。因此,这种膜结合机制在其他生理过程中可能很重要。 [参考:45]

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