N-terminal acetylation of cellular proteins creates specific degradation signals.

N-terminal acetylation of cellular proteins creates specific degradation signals.
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DOI:
10.1126/science.1183147
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发表时间:
2010-02-19
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Varshavsky A
Varshavsky A
中科院分区:
其他
文献类型:
--
作者:
Hwang CS;Shemorry A;Varshavsky A

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新生蛋白保留的n端蛋氨酸(Met)残基通常被n端乙酰化(Nt-acetylated)。氨基肽酶去除n端Met通常会导致n端Ala、Val、Ser、Thr和Cys残基的nt -乙酰化。虽然大多数真核生物蛋白,例如,超过80%的人类蛋白质,都是共翻译nt -乙酰化的,但这种被广泛研究的修饰的功能在很大程度上是未知的。在这里,我们发现,利用酵母酿酒酵母,nt -乙酰化的Met残基可以作为降解信号(degron),被Doa10泛素连接酶靶向。此外,Doa10还识别了nt -乙酰化的Ala、Val、Ser、Thr和Cys残基。几种不同功能的蛋白质含有这些n端度子,称为acn度子,它们构成了细胞蛋白质中普遍存在的一类降解信号。
The retained N-terminal methionine (Met) residue of a nascent protein is often N-terminally acetylated (Nt-acetylated). Removal of N-terminal Met by Met-aminopeptidases frequently leads to Nt-acetylation of the resulting N-terminal Ala, Val, Ser, Thr and Cys residues. Although a majority of eukaryotic proteins, for example, more than 80% of human proteins, are cotranslationally Nt-acetylated, the function of this extensively studied modification is largely unknown. Here we found, using the yeast Saccharomyces cerevisiae, that the Nt-acetylated Met residue could act as a degradation signal (degron), targeted by the Doa10 ubiquitin ligase. Moreover, Doa10 also recognized the Nt-acetylated Ala, Val, Ser, Thr and Cys residues. Several examined proteins of diverse functions contained these N-terminal degrons, termed AcN-degrons, which comprise a prevalent class of degradation signals in cellular proteins.
DOI: 10.1016/0092-8674(90)90481-s
发表时间: 1990-05-18
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