Document Detail


Androgen-dependent synthesis of basic secretory proteins by the rat seminal vesicle.
MedLine Citation:
PMID:  985427     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
1. Two basic proteins were purified from secretions of rat seminal vesicles by using Sephadex G-200 chromatography and polyacrylamide-gel electrophoresis under denaturing conditions. 2. It is not certain that these two proteins are distinct species and not subunits of a larger protein, but their properties are similar. Highly basic (pI = 9.7), they migrate to the cathode at high pH and their amino acid composition shows them to be rich in basic residues and serine. Threonine and hydrophobic residues are few. Both proteins are glycoproteins and have mol.wts. of 17000 and 18500. 3. Together these two proteins account for 25-30% of the protein synthesized by the vesicles, but they are absent from other tissues. 4. Changes in androgen status of the animal markedly affect these proteins. After castration, a progressive decrease in the basic proteins is observed and the synthesis of the two proteins as measured by [35S]methionine incorporation in vitro is is decreased. Testosterone administration in vivo rapidly restores their rates of synthesis. 5. These effects on specific protein synthesis are also observed for total cellular protein, and it is suggested that testosterone acts generally on the total protein-synthetic capacity of the cell and not specifically on individual proteins. Proliferative responses in the secretory epithelium may also be involved. 6. The extreme steroid specificity of the induction process suggests that the synthesis of these basic proteins is mediated by the androgen-receptor system. 7. The biological function of these proteins is not clear, but they do not appear to be involved in the formation of the copulatory plug.
Authors:
S J Higgins; J M Burchell; W I Mainwaring
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Biochemical journal     Volume:  158     ISSN:  0264-6021     ISO Abbreviation:  Biochem. J.     Publication Date:  1976 Aug 
Date Detail:
Created Date:  1976-12-23     Completed Date:  1976-12-23     Revised Date:  2010-09-03    
Medline Journal Info:
Nlm Unique ID:  2984726R     Medline TA:  Biochem J     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  271-82     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Amino Acids / analysis
Animals
Carbohydrates / analysis
Castration
Chromatography, Gel
Corticosterone / pharmacology
Cyproterone / pharmacology
Electrophoresis, Cellulose Acetate
Electrophoresis, Polyacrylamide Gel
Estradiol / pharmacology
Male
Molecular Weight
Protein Biosynthesis*
Proteins / isolation & purification,  secretion
Rats
Seminal Vesicles / secretion*
Testosterone / antagonists & inhibitors,  metabolism*
Chemical
Reg. No./Substance:
0/Amino Acids; 0/Carbohydrates; 0/Proteins; 2098-66-0/Cyproterone; 50-22-6/Corticosterone; 50-28-2/Estradiol; 58-22-0/Testosterone
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