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首页> 外文期刊>Biochemical Pharmacology >Modulation of nitric oxide-stimulated soluble guanylyl cyclase activity by cytoskeleton-associated proteins in vascular smooth muscle
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Modulation of nitric oxide-stimulated soluble guanylyl cyclase activity by cytoskeleton-associated proteins in vascular smooth muscle

机译:血管平滑肌中细胞骨架相关蛋白的一氧化氮刺激可溶性冠状环化酶活性的调节

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摘要

Soluble guanylyl cyclase (sGC, EC 4.6.1.2) is a key enzyme in the regulation of vascular tone. In view of the therapeutic interest of the NO/cGMP pathway, drugs were developed that either increase the NO sensitivity of the enzyme or activate heme-free apo-sGC. However, modulation of sGC activity by endogenous agents is poorly understood. In the present study we show that the maximal activity of NO-stimulated purified sGC is significantly increased by cytosolic preparations of porcine coronary arteries. Purification of the active principle by several chromatographic steps resulted in a protein mixture consisting of 100, 70, and 40?kDa bands on SDS polyacrylamide gel electrophoresis. The respective proteins were identified by LC-MS/MS as gelsolin, annexin A6, and actin, respectively. Further purification resulted in loss of activity, indicating an interaction of sGC with a protein complex rather than a single protein. The partially purified preparation had no effect on basal sGC activity or enzyme activation by the heme mimetic BAY 60-2770, suggesting a specific effect on the conformation of the NO-bound heterodimeric holoenzyme. Since the three proteins identified are all related to contractile elements of smooth muscle, our data suggest that regulation of vascular tone involves a modulatory interaction of sGC with the cytoskeleton.
机译:可溶性观光环酶(SGC,EC 4.6.1.2)是血管间调调节中的关键酶。鉴于NO / CGMP途径的治疗兴趣,开发了药物,可以增加酶的敏感性或活化血红蛋白的APO-SGC。然而,通过内源剂调制SGC活性较差地理解。在本研究中,通过猪冠状动脉的细胞溶质制剂显着增加了无刺激的纯化SGC的最大活性。通过几种色谱步骤纯化活性原理,导致蛋白质混合物由100,70和40μl的蛋白质混合物组成的Sds聚丙烯酰胺凝胶电泳。通过LC-MS / MS作为凝溶胶蛋白,膜蛋白A6和肌动蛋白鉴定各自的蛋白质。进一步纯化导致活性损失,表明SGC与蛋白质复合物的相互作用而不是单一蛋白质。部分纯化的制剂对血红素模拟物舱60-2770没有对基础SGC活性或酶活化的影响,表明对无结合的异二聚体全酶的构象的特异性效果。由于鉴定的三种蛋白质均与平滑肌的收缩元素有关,我们的数据表明血管间调的调节涉及SGC与细胞骨架的调节相互作用。

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