Biol Reprod Keystone Symposia Conference on Frontiers in Reproductive Biology & Regulation of Fertility.
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Biology of Reproduction, Vol 36, 501-510, Copyright © 1987 by Society for the Study of Reproduction

ARTICLES

Analysis of the major large polypeptides of rat seminal vesicle secretion: SVS I, II, and III

CL Wagner and WS Kistler

Rat seminal vesicle secretion (SVS) contains a variety of protein complexes that seem to be linked by interchain disulfide bonds. Upon reduction and analysis by sodium dodecyl sulfate (SDS) gel electrophoresis, this pattern resolves to 3 major high molecular weight (SVS I-100,000, SVS II-50,000, SVS III-37,000) and 3 major low molecular weight protein bands (SVS IV, V, and VI). A two-dimensional SDS gel (1st dimension unreduced, 2nd dimension reduced) permitted identification of the components of the cross-linked species. In the native secretion, SVS I forms a series of oligomers that include both SVS II and III. Essentially all of SVS III is involved in these complexes, while the bulk of SVS II occurs instead as an apparent homodimer. The smaller proteins (SVS IV-VI) are not involved in covalently crosslinked complexes. The reduced forms of the larger polypeptides were isolated by a variety of procedures involving agarose gel filtration in 6M guanidine hydrochloride, reversed-phase high pressure liquid chromatography, ammonium sulfate fractionation, and preparative polyacrylamide gel electrophoresis. Based on its size, solubility, and amino acid composition, SVS II was identified as the major clottable protein of the secretion.


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Copyright © 1987 by the Society for the Study of Reproduction.