Compact conformations of human protein disulfide isomerase.

Compact conformations of human protein disulfide isomerase.
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人蛋白二硫键异构酶的紧凑构象

DOI:
10.1371/journal.pone.0103472
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
Lou J
Lou J
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Yang S;Wang X;Cui L;Ding X;Niu L;Yang F;Wang C;Wang CC;Lou J

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蛋白质二硫异构酶(PDI)由4个硫氧还蛋白样结构域a、b、b‘和a’组成,是内质网中催化蛋白质氧化折叠的关键酶。从人PDI (hPDI)在氧化态和还原态的晶体结构出发,进行了大规模的分子动力学模拟。结果表明,hPDI在溶液中比在晶体结构中具有更紧凑的构象,其稳定主要是通过结构域间的相互作用,包括首次观察到的结构域a和b'之间的盐桥。紧凑构象的一个突出特征是两个催化结构域A和A '可以在足够近的位置进行分子内电子转移,这一点通过在两个结构域之间具有二硫化物的中间体的表征得到了证实。突变破坏了结构域间的相互作用,导致hPDI还原酶活性降低。我们的分子动力学模拟和生化实验揭示了hPDI的内在构象动力学及其生物学影响。
Protein disulfide isomerase (PDI) composed of four thioredoxin-like domains a, b, b', and a', is a key enzyme catalyzing oxidative protein folding in the endoplasmic reticulum. Large scale molecular dynamics simulations starting from the crystal structures of human PDI (hPDI) in the oxidized and reduced states were performed. The results indicate that hPDI adopts more compact conformations in solution than in the crystal structures, which are stabilized primarily by inter-domain interactions, including the salt bridges between domains a and b' observed for the first time. A prominent feature of the compact conformations is that the two catalytic domains a and a' can locate close enough for intra-molecular electron transfer, which was confirmed by the characterization of an intermediate with a disulfide between the two domains. Mutations, which disrupt the inter-domain interactions, lead to decreased reductase activity of hPDI. Our molecular dynamics simulations and biochemical experiments reveal the intrinsic conformational dynamics of hPDI and its biological impact.
DOI: 10.1042/bj2750341
发表时间: 1991-04-15
影响因子: 4.1
作者:
HAWKINS, HC;DENARDI, M;FREEDMAN, RB
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期刊: The Journal of biological chemistry
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