Linked Life Data

3360807

Source:http://linkedlifedata.com/resource/pubmed/id/3360807

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
14
pubmed:dateCreated
1988-6-9
pubmed:abstractText
Fibroblasts increase the catabolism of certain intracellular proteins in response to serum withdrawal, and these proteins contain specific peptide regions that may be required for their increased degradation. We show that the increased degradation of microinjected ribonuclease A during serum withdrawal can be blocked by co-injection of a pentapeptide corresponding to residues 7-11 of ribonuclease A, Lys-Phe-Glu-Arg-Gln. Furthermore, similar peptide sequences appear to play a widespread role in targeting proteins for enhanced degradation. Affinity-purified antibodies raised against the pentapeptide are able to precipitate 20-35% of radiolabeled cytosolic proteins from fibroblasts. Such proteins are preferentially degraded when cells are deprived of serum while nonimmunoprecipitable proteins are degraded at the same rate in the presence and absence of serum. Immunoreactive cytosolic proteins also exist in rat liver and kidney, and these proteins are depleted when protein degradation rates are enhanced due to starvation. Several types of evidence suggest that the peptides recognized in cellular proteins are similar to Lys-Phe-Glu-Arg-Gln but are not this exact sequence. Analyses of amino acid sequences for four proteins whose degradative rates are enhanced in response to serum withdrawal and for four proteins that are degraded in a serum-independent manner indicate two possible peptide motifs related to Lys-Phe-Glu-Arg-Gln that may target cellular proteins for enhanced degradation. These results, combined with previous studies (McElligott, M. A., Miao, P., and Dice, J. F. (1985) J. Biol. Chem. 260, 11986-11993), suggest that these peptide regions target specific proteins to a lysosomal pathway of degradation during serum withdrawal.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0021-9258
pubmed:author
pubmed:issnType
Print
pubmed:day
15
pubmed:volume
263
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
6797-805
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1988
pubmed:articleTitle
Peptide sequences that target proteins for enhanced degradation during serum withdrawal.
pubmed:affiliation
Department of Physiology and Biophysics, Harvard Medical School, Boston, Massachusetts 02115.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.