Circular trimers of gelatinase B/matrix metalloproteinase-9 constitute a distinct population of functional enzyme molecules differentially regulated by tissue inhibitor of metalloproteinases-1.

Circular trimers of gelatinase B/matrix metalloproteinase-9 constitute a distinct population of functional enzyme molecules differentially regulated by tissue inhibitor of metalloproteinases-1.
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明胶酶 B/基质金属蛋白酶-9 的环状三聚体构成了一组独特的功能酶分子,受金属蛋白酶-1 组织抑制剂的差异调节。

DOI:
10.1042/bj20140418
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发表时间:
2015
期刊:
The Biochemical journal
影响因子:
--
通讯作者:
Quigley,Jam
Quigley,Jam
中科院分区:
--
文献类型:
--
作者:
Vandooren,Jennifer;Born,Benjamin;Solomonov,Inna;Zajac,Ewa;Saldova,Radka;Senske,Michael;Ugarte-Berzal,Estefanía;Martens,Erik;VandenSteen,PhilippeE;VanDamme,Jo;Garcia-Pardo,Angeles;Froeyen,Matheus;Deryugina,ElenaI;Quigley,Jam

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明胶酶B/基质金属蛋白酶-9(MMP-9)(EC 3.4.24.35)切割许多底物,并由大多数细胞类型作为酶原proMMP-9与金属蛋白酶组织抑制剂-1(TIMP-1)复合产生。天然proMMP-9以单体、同多聚体和杂合物的形式存在,但我们对proMMP-9单体和多聚体的总体结构的了解有限。我们研究了MMP-9单体和多聚体的酶原和活化形式的生化,生物物理和功能特性。在与传统的概念MMP-9同源多聚体的二聚体的性质相比,我们证明,这些是还原敏感的三聚体。基于电泳、AFM和TEM的信息,我们建立了proMMP-9三聚体的三维结构模型。值得注意的是,proMMP-9三聚体对TIMP-1的亲和力比单体高50倍,在体内,这一发现反映在与单体相比,三聚体对TIMP-1诱导的血管生成的抑制程度更高。我们的研究结果表明,proMMP-9三聚体构成了一个新的结构和功能实体,是由TIMP-1的差异调节。
Gelatinase B/matrix metalloproteinase-9 (MMP-9) (EC 3.4.24.35) cleaves many substrates and is produced by most cell types as a zymogen, proMMP-9, in complex with the tissue inhibitor of metalloproteinases-1 (TIMP-1). Natural proMMP-9 occurs as monomers, homomultimers and heterocomplexes, but our knowledge about the overall structure of proMMP-9 monomers and multimers is limited. We investigated biochemical, biophysical and functional characteristics of zymogen and activated forms of MMP-9 monomers and multimers. In contrast with a conventional notion of a dimeric nature of MMP-9 homomultimers, we demonstrate that these are reduction-sensitive trimers. Based on the information from electrophoresis, AFM and TEM, we generated a 3D structure model of the proMMP-9 trimer. Remarkably, the proMMP-9 trimers possessed a 50-fold higher affinity for TIMP-1 than the monomers.In vivo, this finding was reflected in a higher extent of TIMP-1 inhibition of angiogenesis induced by trimers compared with monomers. Our results show that proMMP-9 trimers constitute a novel structural and functional entity that is differentially regulated by TIMP-1.
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