Linked Life Data

7621882

Source:http://linkedlifedata.com/resource/pubmed/id/7621882

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
7
pubmed:dateCreated
1995-8-29
pubmed:abstractText
Cell surface proteins of the transmembrane 4 superfamily (TM4SF) are a newly characterized family of proteins which are presumed to span the plasma membrane four times. The function of this family of molecules is poorly understood, but based on monoclonal antibody studies there is some evidence that they may be involved in transmembrane signal transduction and regulation of cell proliferation, differentiation, or both, in a number of different cell types. CD53 is a member of this family that is expressed on leukocytes, and transduces activation signals through unknown mechanisms that may involve phosphorylation events. However, CD53 has never been shown to associate directly with kinases. Here, we show by immunoprecipitation from cell lysates of lymph nodes and a thymoma cell line, that immune complexes of rat CD53 contain tyrosine phosphatase activity. The CD53-associated phosphatase was able to dephosphorylate in vitro the phosphorylated tyrosine kinase Lck, as well as a synthetic substrate, and its activity was abrogated by a tyrosine phosphatase inhibitor. Although its identity has not been established, it is clear from depletion experiments that it is not CD45. CD63, a second member of the TM4SF, also co-precipitates a phosphatase activity from rat basophilic leukemia cells. These results demonstrate that the TM4SF members associate with tyrosine phosphatases. It seems possible that such associated phosphatases may contribute to the signal transduction capacity of TM4SF molecules.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0014-2980
pubmed:author
pubmed:issnType
Print
pubmed:volume
25
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
2090-5
pubmed:dateRevised
2011-11-17
pubmed:meshHeading
pubmed:year
1995
pubmed:articleTitle
Association of the transmembrane 4 superfamily molecule CD53 with a tyrosine phosphatase activity.
pubmed:affiliation
MRC Cellular Immunology Unit, Sir William Dunn School of Pathology, University of Oxford, GB.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't