Isolation and characterization of heparin‐ and phosphorylcholine‐binding proteins of boar and stallion seminal plasma. Primary structure of porcine pB1

FEBS Letters

Töpfer-Petersen, Edda³  Sanz, Libia³  Urbanke, Claus²  Calvete, Juan J³  Raida, Manfred¹  Gentzel, Marc³ 

[1] Niedersächsisches Institut für Peptid-Forschung GmbH, Hannover, Germany;Biophysikalische Meßgeräteabteilung, Medizinische Hochschule, Hannover, Germany;Institut für Reproduktionsmedizin, Tierärztliche Hochschule Hannover, Bünteweg 15, 30559 Hannover-Kirchrode, Germany

关键词: Heparin-binding protein;    Phosphorylcholine-binding protein;    Stallion seminal plasma HSP-1 and HSP-2;    Boar seminal plasma pB1 (pAIF-1);    Spermadhesin AQN-1;    Primary structure;    O-Glycosylation;    Fibronectin type II domain;   

DOI  :  10.1016/S0014-5793(97)00344-X

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

In the bovine, seminal plasma heparin-binding proteins bind to sperm lipids containing the phosphorylcholine group and mediate the capacitating effects of heparin-like glycosaminoglycans during sperm residence in the female genital tract. We report the characterization of heparin- and phosphorylcholine-binding proteins of stallion and boar seminal plasma.orseeminallasma proteins HSP-1 and HSP-2, and boar protein pB1, belong to the same family as the bull heparin- and phosphorylcholine-binding proteins BSP-A_1/2, BSP-A₃, and BSP-30K. We have determined the amino acid sequence and posttranslational modifications of boar glycoprotein pB1. It contains 105 amino acids arranged into a mosaic structure consisting of a N-terminal 18-residue O-glycosylated polypeptide followed by two tandemly organized 40–45-residue fibronectin type II domains. pB1 displays 60–65% amino acid sequence similarity with its equine and bovine homologues. However, in their respective seminal plasmas, the BSP and the HSP proteins associate into 90–150-kDa oligomeric complexes, whereas pB1 forms a 35–40-kDa complex with spermadhesin AQN-1. In addition, pB1 appears to be identical to the recently described leukocyte adhesion regulator of porcine seminal fluid pAIF-1. Our results tie in with the hypothesis that homologous proteins from different mammalian species may display distinct biological activities, which may be related to species-specific aspects of sperm physiology.

【 授权许可】

Unknown