Abstract
Phospholamban cDNA from pig stomach smooth muscle was cloned and sequenced. The 737-nucleotide-residue cDNA contained an open reading frame of 156 nucleotide residues encoding a peptide of 52 amino acid residues (Mr 6080). This peptide shares 100% sequence identity with dog cardiac-muscle phospholamban. It differs from rabbit cardiac-muscle and slow-twitch skeletal-muscle phospholamban only at position 2, which is a glutamic acid residue in rabbit phospholamban, but an aspartic acid residue in the pig smooth-muscle protein. Northern-blot analysis reveals the presence of several phospholamban mRNAs in smooth muscle, but a 900-nucleotide-residue and a 2800-nucleotide-residue transcript predominate.
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