Posttranslational regulation of the NKG2D ligand Mult1 in response to cell stress.

Posttranslational regulation of the NKG2D ligand Mult1 in response to cell stress.
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DOI:
10.1084/jem.20081335
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发表时间:
2009-02-16
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Raulet DH
Raulet DH
中科院分区:
其他
文献类型:
--
作者:
Nice TJ;Coscoy L;Raulet DH

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NKG2D是由自然杀伤(NK)细胞和一些T细胞表达的主要刺激性受体。该受体识别主要组织相容性复合物I类细胞表面配体,其在正常组织中表达较差,但通常在转化和感染细胞中被诱导。每个个体中存在几种NKG2D配体,其中一些具有显著不同的蛋白质序列,这提高了不同配体受不同疾病相关应激调控的可能性。一些配体的转录本,包括鼠UL16结合蛋白样转录本1(Mult1),在某些细胞表面表达缺失的正常组织中丰富,表明存在翻译或翻译后调节。我们在这里报告,在正常条件下,Mult1蛋白进行泛素化依赖于赖氨酸在其胞质尾和溶酶体降解。Mult1降解和泛素化在热休克或紫外线照射引起的应激反应中减少,但在其他形式的遗传毒性中没有减少,这为应激介导的NKG2D配体表达的细胞控制提供了一种新机制。
NKG2D is a major stimulatory receptor expressed by natural killer (NK) cells and some T cells. The receptor recognizes major histocompatability complex class I–like cell surface ligands that are poorly expressed by normal tissues but are often induced in transformed and infected cells. The existence of several NKG2D ligands in each individual, some with strikingly divergent protein sequences, raises the possibility that different ligands are regulated by distinct disease-associated stresses. The transcripts for some ligands, including murine UL16-binding proteinlike transcript 1 (Mult1), are abundant in certain normal tissues where cell surface expression is absent, suggesting the existence of translational or posttranslational regulation. We report here that under normal conditions, Mult1 protein undergoes ubiquitination dependent on lysines in its cytoplasmic tail and lysosomal degradation. Mult1 degradation and ubiquitination is reduced in response to stress imparted by heat shock or ultraviolet irradiation, but not by other forms of genotoxicity, providing a novel mechanism for stress-mediated cellular control of NKG2D ligand expression.
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