Linked Life Data

15102831

Source:http://linkedlifedata.com/resource/pubmed/id/15102831

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pubmed-article:15102831pubmed:abstractTextRpn7 is one of the lid subunits of the 26 S proteasome regulatory particle. The RPN7 gene is known to be essential, but its function remains to be elucidated. To explore the function of Rpn7, we isolated and characterized temperature-sensitive rpn7 mutants. All of the rpn7 mutants obtained accumulated poly-ubiquitinated proteins when grown at the restrictive temperature. The N-end rule substrate (Ub-Arg-beta-galactosidase), the UFD pathway substrate (Ub-Pro-beta-galactosidase), and cell cycle regulators (Pds1 and Clb2) were found to be stabilized in experiments using one of the rpn7 mutants termed rpn7-3 at the restrictive temperature, indicating its defect in the ubiquitin-proteasome pathway. Subsequent analysis of the structure of the 26 S proteasome in rpn7-3 cells suggested that the defect was in the assembly of the 26 S holoenzyme. The most striking characteristic of the proteasome of the rpn7-3 mutant was that a lid subcomplex affinity-purified from the rpn7-3 cells grown at the restrictive temperature contained only 5 of the 8 lid components, a phenomenon that has not been reported in the previously isolated lid mutants. From these results, we concluded that Rpn7 is required for the integrity of the 26 S complex by establishing a correct lid structure.lld:pubmed
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pubmed-article:15102831pubmed:articleTitleRpn7 Is required for the structural integrity of the 26 S proteasome of Saccharomyces cerevisiae.lld:pubmed
pubmed-article:15102831pubmed:affiliationDepartment of Biological Sciences, Graduate School of Science, University of Tokyo, Hongo, Tokyo 113-0033, Japan.lld:pubmed
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