Sumoylation regulates lamin A function and is lost in lamin A mutants associated with familial cardiomyopathies.

Sumoylation regulates lamin A function and is lost in lamin A mutants associated with familial cardiomyopathies.
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Sumoylation调节层lamin A功能,并在与家族性心肌病有关的层粘连蛋白A突变体中丢失。

DOI:
10.1083/jcb.200712124
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发表时间:
2008-07-14
影响因子:
7.8
通讯作者:
Sarge, Kevin D.
Sarge, Kevin D.
中科院分区:
生物学1区
文献类型:
--
作者:
Zhang, Yu-Qian;Sarge, Kevin D.

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核纤层蛋白 A 突变会导致许多疾病,包括心肌病和早衰综合症。小泛素样修饰剂 (SUMO) 多肽的共价连接可调节许多蛋白质的功能。到目前为止,尚无已知的在苏酰化共有序列内发生并改变苏酰化的人类致病突变的例子。我们发现核纤层蛋白 A 在赖氨酸 201 处被苏酰化,并且与家族性扩张型心肌病相关的两种核纤层蛋白 A 突变体 E203G 和 E203K 表现出苏酰化降低。 E203在sumoylation共有序列ΨKXE中占据保守的+2位置。核纤层蛋白 A 突变体 E203G、E203K 和 K201R 均表现出类似的异常亚细胞定位,并与细胞死亡增加相关。来自具有 E203K 核纤层蛋白 A 突变的个体的成纤维细胞也表现出核纤层蛋白 A 苏酰化减少和细胞死亡增加。这些结果表明 SUMO 修饰对于正常核纤层蛋白 A 功能很重要,并暗示 E203G/E203K 核纤层蛋白 A 心肌病中 SUMO 化的改变参与其中。
Lamin A mutations cause many diseases, including cardiomyopathies and Progeria Syndrome. The covalent attachment of small ubiquitin-like modifier (SUMO) polypeptides regulates the function of many proteins. Until now, no examples of human disease-causing mutations that occur within a sumoylation consensus sequence and alter sumoylation were known. We show that lamin A is sumoylated at lysine 201 and that two lamin A mutants associated with familial dilated cardiomyopathy, E203G and E203K, exhibit decreased sumoylation. E203 occupies the conserved +2 position in the sumoylation consensus ΨKXE. Lamin A mutants E203G, E203K, and K201R all exhibit a similar aberrant subcellular localization and are associated with increased cell death. Fibroblasts from an individual with the E203K lamin A mutation also exhibit decreased lamin A sumoylation and increased cell death. These results suggest that SUMO modification is important for normal lamin A function and implicate an involvement for altered sumoylation in the E203G/E203K lamin A cardiomyopathies.
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