Atomic structure of the KEOPS complex: an ancient protein kinase-containing molecular machine.

Atomic structure of the KEOPS complex: an ancient protein kinase-containing molecular machine.
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DOI:
10.1016/j.molcel.2008.10.002
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发表时间:
2008-10-24
期刊:
影响因子:
16
通讯作者:
Sicheri, Frank
Sicheri, Frank
中科院分区:
生物学1区
文献类型:
--
作者:
Mao, Daniel Y. L.;Neculai, Dante;Downey, Michael;Orlicky, Stephen;Haffani, Yosr Z.;Ceccarelli, Derek F.;Ho, Jenny S. L.;Szilard, Rachel K.;Zhang, Wei;Ho, Cynthia S.;Wan, Leo;Fares, Christophe;Rumpel, Sigrun;Kurinov, Igor;Arrowsmith, Cheryl H.;Durocher, Daniel;Sicheri, Frank

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Kae1是一种普遍保守的ATP酶,是细菌必需基因组的一部分。在古生菌和真核生物中,Kae1嵌入在含有蛋白激酶的KEOPS复合物中。酵母中KEOPS亚基的突变导致显著的端粒和转录缺陷,但KEOPS的确切生化功能尚不清楚。作为阐明其功能的第一步,我们解决了涉及Kae1,Bud32,Pcc1和Cgi121亚基的古细菌衍生的KEOPS复合物的原子结构。我们的研究表明,Kae1在两个水平上受到原始蛋白激酶Bud32的调节,Bud32本身受到Cgi121的调节。此外,Pcc1似乎作为一个二聚化模块的功能,也许表明,KEOPS可能是一个进行性的分子机器。最后,由于Bud32缺乏包括激活片段的真核蛋白激酶的常规底物识别基础结构,Bud32可以提供蛋白激酶家族进化历史的一瞥。
Kae1 is a universally conserved ATPase and part of the essential gene set in bacteria. In archaea and eukaryotes, Kae1 is embedded within the protein kinase-containing KEOPS complex. Mutation of KEOPS subunits in yeast leads to striking telomere and transcription defects but the exact biochemical function of KEOPS is not known. As a first step to elucidating its function, we solved the atomic structure of archaea-derived KEOPS complexes involving Kae1, Bud32, Pcc1 and Cgi121 subunits. Our studies suggest that Kae1 is regulated at two levels by the primordial protein kinase Bud32, which is itself regulated by Cgi121. Moreover, Pcc1 appears to function as a dimerization module, perhaps suggesting that KEOPS may be a processive molecular machine. Lastly, as Bud32 lacks the conventional substrate-recognition infrastructure of eukaryotic protein kinases including an activation segment, Bud32 may provide a glimpse of the evolutionary history of the protein kinase family.
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