Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2000-6-5
pubmed:abstractText
The 20S proteasome and the 26S proteasome are major components of the cytosolic and nuclear proteasomal proteolytic systems. Since proteins are known to be highly susceptible targets for reactive oxygen species, the effect of H(2)O(2) treatment of K562 human hematopoietic cells toward the activities of 20S and 26S proteasomes was investigated. While the ATP-independent degradation of the fluorogenic peptide suc-LLVY-MCA was not affected by H(2)O(2) concentrations of up to 5 mM, the ATP-stimulated degradation of suc-LLVY-MCA by the 26S proteasome began to decline at 400 microM and was completely abolished at 1 mM oxidant treatment. A combination of nondenaturing electrophoresis and Western blotting let us believe that the high oxidant susceptibility of the 26S proteasome is due to oxidation of essential amino acids in the proteasome activator PA 700 which mediates the ATP-dependent proteolysis of the 26S-proteasome. The activity of the 26S-proteasome could be recovered within 24 h after exposure of cells to 1 mM H(2)O(2) but not after 2 mM H(2)O(2). In view of the specific functions of the 26S proteasome in cell cycle control and other important physiological functions, the consequences of the higher susceptibility of this protease toward oxidative stress needs to be considered.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
http://linkedlifedata.com/resource/pubmed/chemical/ATP dependent 26S protease, http://linkedlifedata.com/resource/pubmed/chemical/Acetylcysteine, http://linkedlifedata.com/resource/pubmed/chemical/Adenosine Triphosphate, http://linkedlifedata.com/resource/pubmed/chemical/Coumarins, http://linkedlifedata.com/resource/pubmed/chemical/Cysteine Endopeptidases, http://linkedlifedata.com/resource/pubmed/chemical/Cysteine Proteinase Inhibitors, http://linkedlifedata.com/resource/pubmed/chemical/Fluorescent Dyes, http://linkedlifedata.com/resource/pubmed/chemical/Hydrogen Peroxide, http://linkedlifedata.com/resource/pubmed/chemical/Multienzyme Complexes, http://linkedlifedata.com/resource/pubmed/chemical/Oligopeptides, http://linkedlifedata.com/resource/pubmed/chemical/Oxidants, http://linkedlifedata.com/resource/pubmed/chemical/Peptide Hydrolases, http://linkedlifedata.com/resource/pubmed/chemical/Proteasome Endopeptidase Complex, http://linkedlifedata.com/resource/pubmed/chemical/lactacystin, http://linkedlifedata.com/resource/pubmed/chemical/succinyl-leucyl-leucyl-valyl-tyrosyl...
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0003-9861
pubmed:author
pubmed:copyrightInfo
Copyright 2000 Academic Press.
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
377
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
65-8
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed-meshheading:10775442-Acetylcysteine, pubmed-meshheading:10775442-Adenosine Triphosphate, pubmed-meshheading:10775442-Cell Survival, pubmed-meshheading:10775442-Coumarins, pubmed-meshheading:10775442-Cysteine Endopeptidases, pubmed-meshheading:10775442-Cysteine Proteinase Inhibitors, pubmed-meshheading:10775442-Dose-Response Relationship, Drug, pubmed-meshheading:10775442-Fluorescent Dyes, pubmed-meshheading:10775442-Humans, pubmed-meshheading:10775442-Hydrogen Peroxide, pubmed-meshheading:10775442-K562 Cells, pubmed-meshheading:10775442-Multienzyme Complexes, pubmed-meshheading:10775442-Oligopeptides, pubmed-meshheading:10775442-Oxidants, pubmed-meshheading:10775442-Oxidation-Reduction, pubmed-meshheading:10775442-Oxidative Stress, pubmed-meshheading:10775442-Peptide Hydrolases, pubmed-meshheading:10775442-Proteasome Endopeptidase Complex, pubmed-meshheading:10775442-Time Factors
pubmed:year
2000
pubmed:articleTitle
Differential impairment of 20S and 26S proteasome activities in human hematopoietic K562 cells during oxidative stress.
pubmed:affiliation
Clinics of Physical Medicine and Rehabilitation, Medical Faculty (Charité), Humboldt University Berlin, Schumannstrasse 20/21, Berlin, D-10098, Germany.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't