Heterohexameric ring arrangement of the eukaryotic proteasomal ATPases: implications for proteasome structure and assembly.

Heterohexameric ring arrangement of the eukaryotic proteasomal ATPases: implications for proteasome structure and assembly.
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DOI:
10.1016/j.molcel.2010.02.035
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发表时间:
2010-05-14
期刊:
影响因子:
16
通讯作者:
Hochstrasser M
Hochstrasser M
中科院分区:
生物学1区
文献类型:
--
作者:
Tomko RJ Jr;Funakoshi M;Schneider K;Wang J;Hochstrasser M

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The proteasome has a paramount role in eukaryotic cell regulation. It consists of a proteolytic core particle (CP) bound to one or two regulatory particles (RPs). Each RP is believed to include six different AAA+ ATPases in a heterohexameric ring that binds the CP while unfolding and translocating substrates into the core. No atomic-resolution RP structures are available. Guided by crystal structures of related homohexameric prokaryotic ATPases, we use disulfide engineering to show that the eukaryotic ATPases form a ring with the arrangement Rpt1-Rpt2-Rpt6-Rpt3-Rpt4-Rpt5 in fully assembled proteasomes. This arrangement is consistent with known assembly intermediates. The new quaternary organization clarifies the functional overlap of specific RP assembly chaperones and led us to identify a potential RP assembly intermediate that includes four ATPases (Rpt6-Rpt3-Rpt4-Rpt5) and their cognate chaperones (Rpn14, Nas6, and Nas2). Finally, the ATPase ring structure casts light on alternative RP structural models and the mechanism of RP action.
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