Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1986-11-26
pubmed:abstractText
Signal recognition particle (SRP) and SRP receptor are known to be essential components of the cellular machinery that targets nascent secretory proteins to the endoplasmic reticulum (ER) membrane. Here we report that the SRP receptor contains, in addition to the previously identified and sequenced 69-kD polypeptide (alpha-subunit, SR alpha), a 30-kD beta-subunit (SR beta). When SRP receptor was purified by SRP-Sepharose affinity chromatography, we observed the co-purification of two other ER membrane proteins. Both proteins are approximately 30 kD in size and are immunologically distinct from each other, as well as from SR alpha and SRP proteins. One of the 30-kD proteins (SR beta) forms a tight complex with SR alpha in detergent solution that is stable to high salt and can be immunoprecipitated with antibodies to either SR alpha or SR beta. Both subunits are present in the ER membrane in equimolar amounts and co-fractionate in constant stoichiometry when rough and smooth liver microsomes are separated on sucrose gradients. We therefore conclude that SR beta is an integral component of SRP receptor. The presence of SR beta was previously masked by proteolytic breakdown products of SR alpha observed by others and by the presence of another 30-kD ER membrane protein (mp30) which co-purifies with SR alpha. Mp30 binds to SRP-Sepharose directly and is present in the ER membrane in several-fold molar excess of SR alpha and SR beta. The affinity of mp30 for SRP suggests that it may serve a yet unknown function in protein translocation.
pubmed:grant
pubmed:commentsCorrections
http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-109833, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-13671378, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-13793161, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-13893456, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-2410409, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-2581979, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-2999608, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-3010127, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-4018097, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-4043092, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-4128882, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-4150488, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-6088076, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-6177701, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-6197610, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-6292236, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-6296816, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-6317198, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-6501423, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-6501424, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-6656655, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-6855576, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-6855596, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-691044, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-7000796, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-7009747, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-7088152, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-7142712, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-7309797, http://linkedlifedata.com/resource/pubmed/commentcorrection/3021779-96441
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0021-9525
pubmed:author
pubmed:issnType
Print
pubmed:volume
103
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1167-78
pubmed:dateRevised
2009-11-18
pubmed:meshHeading
pubmed:year
1986
pubmed:articleTitle
The signal recognition particle receptor is a complex that contains two distinct polypeptide chains.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't