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Journal of Reproduction and Fertility (1994) 100 245-255
DOI: 10.1530/jrf.0.1000245
Copyright © 1994 Society for Reproduction and Fertility
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Amino acid sequence of a porcine zona pellucida glycoprotein ZP4 determined by peptide mapping and cDNA cloning

A. Hasegawa, K. Koyama, Y. Okazaki, M. Sugimoto and S. Isojima

Mammalian zona pellucida is an attractive target for developing a contraceptive vaccine. In this study, the amino acid sequence of a core protein of porcine zona pellucida glycoprotein ZP4 was determined by peptide mapping and cDNA cloning. Two kinds of ZP4 peptides were identified: one consisted of 128 amino acid residues and the other of 133 amino acid residues with an additional five amino acid sequence at the carboxy-terminal end of the 128 amino acid peptide. Both peptides had two potential N-linked glycosylation sites. The 128 amino acid peptide showed 39.1% similarity to the amino-terminal region of mouse ZP2 polypeptide. The positions of five cysteine residues were the same for porcine ZP4 and mouse ZP2. The cloned cDNA possessed an additional 195 nucleotides at the 3' end of the sequence corresponding to the 133 amino acid peptide. This additional sequence was found to encode the amino-terminal 10 amino acid sequence of porcine ZP2 polypeptide. These results suggest that porcine ZP4 and ZP2 are derived from a common parent polypeptide by proteolytic cleavage at the position between 133 and 134 residues.




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