Polymerization of Plasminogen Activator Inhibitor-1*

Polymerization of Plasminogen Activator Inhibitor-1*
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纤溶酶原激活剂抑制剂-1* 的聚合

DOI:
10.1074/jbc.m010631200
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发表时间:
2001
期刊:
The Journal of Biological Chemistry
影响因子:
--
通讯作者:
D. Lomas
D. Lomas
中科院分区:
--
文献类型:
--
作者:
Aiwu Zhou;R. Faint;P. Charlton;T. Dafforn;R. Carrell;D. Lomas

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丝氨酸蛋白酶抑制剂 (serpin) 纤溶酶原激活剂抑制剂-1 (PAI-1) 的活性是通过将反应环分子内掺入 β-片层 A 并产生无活性的潜在物种来控制的。丝氨酸蛋白酶抑制剂超家族的其他成员可以通过一个分子的反应环与第二个分子的β-折叠A之间的分子间连接而病理性失活,从而形成与多种疾病相关的聚合物链。长期以来,人们一直认为 PAI-1 在活性丝氨酸蛋白酶抑制剂中是独一无二的,因为它不形成聚合物。我们在此表明​​,重组天然 PAI-1 和潜在 PAI-1 在低 pH 条件下可在体外自发形成聚合物,尽管其聚合电泳模式明显不同。天然和潜在物种的聚合物与其他丝氨酸蛋白酶抑制剂的典型环-A-片层聚合物不同,因为它们容易解离回其原始单体形式。 PAI-1 的研究结果与不同的连接机制相一致,每种机制都涉及将反应环添加到天然 PAI-1 中的 s7A 和潜在 PAI-1 中的 s1C 上。糖基化的天然和潜在 PAI-1 也可以在类似条件下形成聚合物,这在血小板的低 pH 环境中可能具有体内重要性。
The activity of the serine proteinase inhibitor (serpin) plasminogen activator inhibitor-1 (PAI-1) is controlled by the intramolecular incorporation of the reactive loop into β-sheet A with the generation of an inactive latent species. Other members of the serpin superfamily can be pathologically inactivated by intermolecular linkage between the reactive loop of one molecule and β-sheet A of a second to form chains of polymers associated with diverse diseases. It has long been believed that PAI-1 is unique among active serpins in that it does not form polymers. We show here that recombinant native and latent PAI-1 spontaneously form polymers in vitro at low pH although with distinctly different electrophoretic patterns of polymerization. The polymers of both the native and latent species differ from the typical loop-A-sheet polymers of other serpins in that they readily dissociate back to their original monomeric form. The findings with PAI-1 are compatible with different mechanisms of linkage, each involving β-strand addition of the reactive loop to s7A in native PAI-1 and to s1C in latent PAI-1. Glycosylated native and latent PAI-1 can also form polymers under similar conditions, which may be of in vivo importance in the low pH environment of the platelet.
内皮细胞产生纤溶酶原激活剂的潜在抑制剂,可以被变性剂激活。
DOI: --
发表时间: 1985
期刊: The Journal of biological chemistry
影响因子: --
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DOI: 10.1074/jbc.270.34.20032
发表时间: 1995
期刊: The Journal of biological chemistry
影响因子: --
作者:
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DOI: --
发表时间: 1993
期刊: The Journal of biological chemistry
影响因子: --
作者:
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DOI: 10.1021/bi00125a012
发表时间: 1992-03-17
期刊: BIOCHEMISTRY
影响因子: 2.9
作者:
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通讯作者: SALVESEN, G