Linked Life Data

3747520

Source:http://linkedlifedata.com/resource/pubmed/id/3747520

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1986-10-8
pubmed:abstractText
Physico-chemical characterization of the sex steroid-binding protein, SBP, of rabbit plasma reveals that it is a dimer of mol. wt 85,800 composed of similar subunits of mol. wt 43,000. These data confirm our original proposal for a dimeric structure. The protein contains 9% carbohydrate, comprised of mannose, galactose, N-acetylglucosamine and sialic acid. It is devoid of N-acetylgalactosamine and fucose. The protein binds one molecule of 5 alpha-dihydrotestosterone per dimer with a Kd of 0.89 nM (12 degrees C). Comparison with the human, monkey and baboon SBPs indicates that all these proteins have the same dimeric molecular organization and exhibit microheterogeneity in SDS-PAGE and isoelectricfocusing. Rabbit SBP, however, contains less carbohydrate and has a higher polypeptide molecular weight than all the other SBPs. Spectrophotometric data also indicate that some tryptophan residues are in a different chemical environment than those in other SBPs. The observed microheterogeneity in all four SBP species is due for the most part to variable glycosylation of the subunit and variability at the amino-terminal region of the subunit. Combination of these and other phenomena will generate a significant number of isomeric forms of the SBP subunit which will then interact stoichiometrically to yield active dimeric SBP molecules. These differ slightly from each other depending upon the charge and size of the subunit comprising the dimeric structure, and will result in the observed microheterogeneity of pure SBP preparations. Based on these results along with more recent amino acid sequence data, we conclude that all four SBPs are dimers composed of identical polypeptide chains.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0022-4731
pubmed:author
pubmed:issnType
Print
pubmed:volume
25
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
191-200
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1986
pubmed:articleTitle
Molecular characterization of the sex steroid binding protein (SBP) of plasma. Re-examination of rabbit SBP and comparison with the human, macaque and baboon proteins.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't