title: Construction of bacterial plasmids that contain the nucleotide sequence for bovine corticotropin-beta-lipotropin precursor.
abstract: mRNA that encodes the common peptide precursor for the hormones corticotropin and beta-lipotropin was purified from the neurointermediate lobe of bovine pituitaries, and double-stranded cDNA species synthesized from this template were cloned in Escherichia coli X1776 by inserting them into the Pst I endonuclease cleavage site of the pBR322 plasmid using poly(dG)poly(dC) homopolymeric extensions. Certain of the cloned cDNA inserts contain nucleotides corresponding to the complete amino acid sequence of bovine corticotropin and a coding sequence that corresponds to at least the first portion of bovine beta-lipotropin. The nucleotide sequences coding for corticotropin and beta-lipotropin are separated on the cDNA by a 6-base-pair sequence encoding lysine and arginine, indicating that the carboxyl terminus of corticotropin is connected on the precursor peptide with the amino terminus of beta-lipotropin by these two amino acids. In addition, the cloned cDNA insert is characterized by an unusually high C+G nucleotide base content as well as by a number of DNA sequence duplications.
mesh_terms: D000324:Adrenocorticotropic Hormone / Q000235:genetics*; D001483:Base Sequence; D004269:DNA, Bacterial / Q000235:genetics; D004274:DNA, Recombinant; D004926:Escherichia coli / Q000235:genetics; D005796:Genes; D008722:Methods; D010957:Plasmids; D011498:Protein Precursors / Q000235:genetics*; D008083:beta-Lipotropin / Q000235:genetics*
chemical_list: D004269:DNA, Bacterial; D004274:DNA, Recombinant; D011498:Protein Precursors; D000324:Adrenocorticotropic Hormone; D008083:beta-Lipotropin