β₂-microglobulin forms three-dimensional domain-swapped amyloid fibrils with disulfide linkages.

β₂-microglobulin forms three-dimensional domain-swapped amyloid fibrils with disulfide linkages.
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DOI:
10.1038/nsmb.1948
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发表时间:
2011-01
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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--
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β2-微球蛋白(β 2 m)是I型主要组织相容性复合体的轻链。在长期血液透析治疗期间,它作为淀粉样纤维沉积在关节内。尽管透析相关淀粉样变性具有破坏性作用,但对可溶性β 2 m如何形成纤维的充分理解仍然难以捉摸。在这里,我们表明β 2 m可以通过3D结构域交换寡聚化和固定化。从β 2 m寡聚体中分离出共价结合的结构域交换二聚体,我们能够确定其晶体结构。连接交换结构域和核心结构域的铰链环包括折叠片段LSFSKD,我们还确定了其原子结构。LSFSKD结构揭示了5类空间拉链,类似于其他淀粉样蛋白棘。二聚体和拉链棘的结构很好地符合β 2 m纤维形式的原子模型,β 2 m在生理条件下缓慢组装。
β2-microglobulin (β2m) is the light chain of type I major histocompatibility complex. It deposits as amyloid fibrils within joints during long-term hemodialysis treatment. Despite the devastating effects of dialysis-related amyloidosis, full understanding of how fibrils form from soluble β2m remains elusive. Here we show that β2m can oligomerize and fibrillize via 3D domain swapping. Isolating a covalently bound, domain-swapped dimer from β2m oligomers on the pathway to fibrils, we were able to determine its crystal structure. The hinge loop which connects the swapped domain to the core domain includes the fibrillizing segment LSFSKD, whose atomic structure we also determined. The LSFSKD structure reveals a Class 5 steric zipper, akin to other amyloid spines. The structures of the dimer and the zipper spine fit well into an atomic model for this fibrillar form of β2m, which assembles slowly under physiological conditions.
DOI: 10.1107/s0907444904019158
发表时间: 2004-12-01
影响因子: 2.2
作者:
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通讯作者: Cowtan, K
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发表时间: 2004-07-20
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发表时间: 2008-09
影响因子: 16.8
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期刊: EUROPEAN JOURNAL OF BIOCHEMISTRY
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期刊: BIOCHEMISTRY
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