[No authors listed]
Complementary DNA (cDNA) encoding a protein component pB1 (also pAIF-1 and DQH) of the 54-kilodalton glycoprotein of boar seminal plasma was cloned and its nucleotide sequence was determined (Gene Bank accession no. AF047026). The pB1 precursor protein is a 130-amino-acid-long polypeptide containing a 25-amino-acid-long signal peptide. The amino acid sequence of the pB1 is homologous to that of SFP1_BOVIN (named also BSP-A1/A2, PDC-109/ major protein and SVSp109), SFP3_BOVIN (BSP-A3), SFP4 BOVIN (BSP-30 KD), and SP1_HORSE (HSP-1) seminal plasma proteins. The homology extends also for the signal peptide of SFP1_BOVIN protein. All these seminal plasma proteins contain two fibronectin type-II domains that differ from those found in other proteins such as colagenases, fibronectins, and mannose receptors. The first domain located in the N-terminal region of pB1 is four amino acids shorter than those present in other proteins. High homology is also observed between 3' noncoding regions of the nucleotide sequences of cDNAs of pB1_PIG and SFP1_BOVIN (Gene Bank accession nos. AF047026 and P02784, respectively).
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