An archaeal homolog of proteasome assembly factor functions as a proteasome activator.

An archaeal homolog of proteasome assembly factor functions as a proteasome activator.
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DOI:
10.1371/journal.pone.0060294
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Kato K
Kato K
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Kumoi K;Satoh T;Murata K;Hiromoto T;Mizushima T;Kamiya Y;Noda M;Uchiyama S;Yagi H;Kato K

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Assembly of the eukaryotic 20S proteasome is an ordered process involving several proteins operating as proteasome assembly factors including PAC1-PAC2 but archaeal 20S proteasome subunits can spontaneously assemble into an active cylindrical architecture. Recent bioinformatic analysis identified archaeal PAC1-PAC2 homologs PbaA and PbaB. However, it remains unclear whether such assembly factor-like proteins play an indispensable role in orchestration of proteasome subunits in archaea. We revealed that PbaB forms a homotetramer and exerts a dual function as an ATP-independent proteasome activator and a molecular chaperone through its tentacle-like C-terminal segments. Our findings provide insights into molecular evolution relationships between proteasome activators and assembly factors.
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