Abstract
A new prolactin-like cDNA clone, bPLP-IV, was isolated from a bovine placental cDNA library and the complete nucleotide sequence was determined. The bPLP-IV encodes a protein consisting of 237 amino acids, which is related to, but different from seven other known bovine prolactin-like proteins including two placental lactogens. The predicted amino acid sequence of the bPLP-IV shows over 52% identity to other known members of bovine prolactin-like proteins, 48% to bovine prolactin, 40% to both two bovine placental lactogens and only 22% to bovine growth hormone. The bPLP-IV protein has a unique feature in its primary structure, lacking the two C-terminal cysteine residues which are completely conserved in all other known members of prolactin-growth hormone-placental lactogen gene family. The expression of bPLP-IV in developing bovine placenta was apparently stage-specific, being maximal in the full-term placenta.
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