Dissection of the assembly pathway of the proteasome lid in Saccharomyces cerevisiae - PubMed (original) (raw)
. 2010 Jun 11;396(4):1048-53.
doi: 10.1016/j.bbrc.2010.05.061. Epub 2010 May 21.
Affiliations
- PMID: 20471955
- DOI: 10.1016/j.bbrc.2010.05.061
Dissection of the assembly pathway of the proteasome lid in Saccharomyces cerevisiae
Keisuke Fukunaga et al. Biochem Biophys Res Commun. 2010.
Abstract
The 26S proteasome is a highly conserved multisubunit protease that degrades ubiquitinated proteins in eukaryotic cells. It comprises a 20S core particle and two 19S regulatory particles that are further divided into the lid and base complexes. The lid is a nine subunits complex that is structurally related to the COP9 signalosome and the eukaryotic initiation factor 3. Although the assembly pathway of the 20S and the base are well described, that of the lid is still unclear. In this study, we dissected the lid assembly using yeast lid mutant cells, rpn7-3, Delta rpn9, and rpn12-1. Using mass spectrometry, we identified a number of lid subassemblies, such as Rpn3-Rpn7 pair and a lid-like complex lacking Rpn12, in the mutants. Our analysis suggests that the assembly of the lid is a highly ordered and multi-step process; first, Rpn5, 6, 8, 9, and 11 are assembled to form a core module, then a second module, consisting of Rpn3, 7, and Sem1, is attached, followed by the incorporation of Rpn12 to form the lid complex.
(c) 2010 Elsevier Inc. All rights reserved.
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