title: Half-life of proteasomes (multiprotease complexes) in rat liver.
abstract: Proteasomes (large multicatalytic proteinase complexes) are abundant in rat liver, constituting approximately 1.0% of the total soluble proteins. In the present study, the apparent half-life of the proteasomes was determined to be 12-15 days from the decay curve of isotopically labeled enzymes in vivo, suggesting their slow turnover. This finding together with the ubiquitous distribution of proteasomes in eukaryotic cells (Tanaka et al., 1988 J. Biol. Chem. 263, 16209-16217) indicates that proteasomes belong to a family of proteins with house-keeping function.
authors.affiliation: Institute for Enzyme Research, University of Tokushima, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Tanaka
authors.forename: A
authors.initials: A
authors.lastname: Ichihara
mesh_terms: D000818:Animals; D000906:Antibodies; D002846:Chromatography, Affinity; D003546:Cysteine Endopeptidases; D010450:Endopeptidases / Q000302:isolation & purification / Q000378:metabolism*; D006207:Half-Life; D007700:Kinetics; D007930:Leucine / Q000378:metabolism; D008099:Liver / Q000201:enzymology*; D009097:Multienzyme Complexes / Q000302:isolation & purification / Q000378:metabolism*; D046988:Proteasome Endopeptidase Complex; D051381:Rats
chemical_list: D000906:Antibodies; D009097:Multienzyme Complexes; D010450:Endopeptidases; D003546:Cysteine Endopeptidases; D046988:Proteasome Endopeptidase Complex; D007930:Leucine