title: Rapid isolation and characterization of the yeast proteasome regulatory complex.
abstract: The 26S proteasome, which catalyzes degradation of ubiquitinated proteins, is composed of the 20S proteasome and the 19S complex. Recently, it has been reported that the 26S complex can be dissociated into the lid complex and the 20S-proteasome-base complex in a mutant yeast and that the lid complex is required for ubiquitin-dependent proteolysis. In the present study, we established methods for rapid isolation of the 19S complex, the lid complex, and the base complex from wild-type yeast. The isolated 19S complex was capable of binding to the 20S proteasome to reconstitute the 26S proteasome. In contrast with the previously reported result showing that Rpn10, a multiubiquitin chain binding subunit, is a component of the base complex, we present evidence that the lid complex isolated from wild-type yeast contains Rpn10.
authors.affiliation: Department of Biochemistry, Hokkaido University, Sapporo, 060-0812, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Saeki
authors.forename: A
authors.initials: A
authors.lastname: Toh-e
authors.forename: H
authors.initials: H
authors.lastname: Yokosawa
mesh_terms: D000595:Amino Acid Sequence; D002352:Carrier Proteins / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification; D002846:Chromatography, Affinity; D003546:Cysteine Endopeptidases / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification; D009097:Multienzyme Complexes / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification; D010447:Peptide Hydrolases / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification*; D046988:Proteasome Endopeptidase Complex; D020836:Protein Structure, Quaternary; D011506:Proteins / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification; D012441:Saccharomyces cerevisiae / Q000201:enzymology* / Q000235:genetics; D029701:Saccharomyces cerevisiae Proteins
chemical_list: D002352:Carrier Proteins; D009097:Multienzyme Complexes; C114551:NAS6 protein, S cerevisiae; D011506:Proteins; C122019:RPN10 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D010447:Peptide Hydrolases; D003546:Cysteine Endopeptidases; D046988:Proteasome Endopeptidase Complex; C061553:ATP dependent 26S protease