A regulatable switch mediates self-association in an immunoglobulin fold.

A regulatable switch mediates self-association in an immunoglobulin fold.
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DOI:
10.1038/nsmb.1483
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发表时间:
2008-09
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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β-2微球蛋白(β2m)是一种球状蛋白,在接受血液透析治疗的患者中可自我结合成纤维状淀粉样蛋白沉积。这些富含β薄片的组装体的形成是多肽的基本特性,可以由不同的条件触发。对于β2m,在Cu2+配位的特异性反应中,低聚进入淀粉样变性前状态。在这里,我们报告了原子分辨率下这种自结合的基础。金属不是分子界面的直接参与者。相反,结合导致远端改变,从而形成两个新的表面。它们相互作用形成封闭的六聚体物种。其起源包括先前涉及β2m聚集途径的隐藏和保守的顺式脯氨酸的异构化。这种异构化的结果是显而易见的,并揭示了这种强大的单体蛋白转化为淀粉样蛋白状态的分子基础。
β-2 microglobulin (β2m) is a globular protein that self-associates into fibrillar amyloid deposits in patients undergoing hemodialysis therapy. Formation of these β-sheet–rich assemblies is a fundamental property of polypeptides that can be triggered by diverse conditions. For β2m, oligomerization into pre-amyloidogenic states occurs in specific response to coordination by Cu2+. Here we report the basis for this self-association at atomic resolution. Metal is not a direct participant in the molecular interface. Rather, binding results in distal alterations enabling the formation of two new surfaces. These interact to form a closed hexameric species. The origins of this include isomerization of a buried and conserved cis-proline previously implicated in the β2m aggregation pathway. The consequences of this isomerization are evident and reveal a molecular basis for the conversion of this robust monomeric protein into an amyloid-competent state.
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