Autodeimination of protein arginine deiminase 4 alters protein-protein interactions but not activity.

Autodeimination of protein arginine deiminase 4 alters protein-protein interactions but not activity.
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DOI:
10.1021/bi200309e
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发表时间:
2011-05-17
期刊:
影响因子:
2.9
通讯作者:
Thompson PR
Thompson PR
中科院分区:
生物学3区
文献类型:
--
作者:
Slack JL;Jones LE Jr;Bhatia MM;Thompson PR

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蛋白质精氨酸脱亚胺酶(PAD)催化肽基精氨酸水解形成肽基瓜氨酸,在细胞凋亡、分化和转录调控等多种信号转导途径中发挥重要作用。除了这些重要的细胞作用之外,PAD活性在多种人类疾病中失调(例如,风湿性关节炎(RA)、癌症和结肠炎),并且显著地,用Cl-脒抑制PAD已显示在RA的胶原诱导的关节炎模型中降低疾病严重程度。虽然这些酶在人类细胞信号传导和疾病中发挥重要作用,但在生理和病理条件下调节PAD活性的机制知之甚少。调节PAD活性的一种可能机制是自脱亚氨作用,我们和其他人已经证明,PAD 4在体外和体内都会受到这种作用。在此,我们证明,PAD4 autodeimination不改变活性,底物特异性,或钙依赖性的这种同工酶。然而,这些研究的结果表明,自脱亚氨作用在调节PAD 4与组蛋白脱乙酰酶1(HDAC 1)、瓜氨酸化组蛋白H3(Cit H3)和蛋白质精氨酸甲基转移酶1(PRMT 1)相互作用的能力中具有新的作用。
The Protein Arginine Deiminases (PAD), which catalyze the hydrolysis of peptidyl-arginine to form peptidyl-citrulline, play important roles in a variety of cell signaling pathways including apoptosis, differentiation, and transcriptional regulation. In addition to these important cellular roles, PAD activity is dysregulated in multiple human diseases (e.g., Rheumatoid Arthritis (RA), Cancer, and Colitis), and, significantly, PAD inhibition with Cl-amidine has been shown to reduce disease severity in the Collagen Induced Arthritis model of RA. Although these enzymes play important roles in human cell signaling and disease, the mechanisms that regulate PAD activity under both physiological and pathological conditions are poorly understood. One possible mechanism for regulating PAD activity is autodeimination, which we and others have shown that PAD4 is subject to in vitro and in vivo. Herein, we demonstrate that PAD4 autodeimination does not alter the activity, substrate specificity, or calcium dependence of this isozyme. However, the results of these studies indicate a novel role for autodeimination in modulating the ability of PAD4 to interact with Histone Deacetylase 1 (HDAC1), citrullinated histone H3 (Cit H3), and Protein Arginine Methyltransferase 1 (PRMT1).
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