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BSP-A1, BSP-A2, BSP-A3, and BSP-30-kDa are four major proteins of bovine seminal plasma (BSP protein family). These heparin- and phosphatidylcholine-binding proteins potentiate the capacitation of spermatozoa. Here we determined the complete sequences of the two cDNAs coding for the BSP-A3 and BSP-30-kDa proteins. Degenerate oligonucleotides designed on the basis of the primary sequences of the proteins were used as primers in reverse transcription-polymerase chain reaction, with cDNA preparations of bovine seminal vesicles as templates, to amplify an internal fragment of each BSP cDNA. Specific oligonucleotides designed on the basis of these partial cDNA sequences were used to clone the two complete cDNAs by using the 3' rapid amplification of cDNA ends (RACE) and 5' RACE methods. We also verified the expression of all members of the bovine BSP protein family in several adult bovine tissues by RNase protection assays. The results indicated that each BSP protein mRNA is expressed only in seminal vesicles and in the ampullae. Homologous genes were detected in human, rat, hamster, and rabbit genomic DNA, using high-stringency Southern hybridization with a specific BSP-30-kDa cDNA probe.

biology of reproduction

Complementary Deoxyribonucleic Acid Cloning and Tissue Expression of BSP-A3 and BSP-30-kDa: Phosphatidylcholine and Heparin-Binding Proteins of Bovine Seminal Plasma1