The sequence of a cloned cDNA for the β subunit of bovine thyrotropin predicts a protein containing both NH2- and COOH-terminal extensions

Richard Maurer, M. L. Croyle, J. E. Donelson

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Abstract

Cloned cDNAs containing sequences coding for the β subunit of bovine thyrotropin have been identified. The complete nucleotide sequence of the largest of the β subunit cDNA inserts has been determined. This cDNA contains 35 nucleotides from the 5' untranslated region of thyrotropin β subunit mRNA and 60 nucleotides coding for an NH2-terminal precursor segment. This is followed by 339 nucleotides which code for the published amino acid sequence of the thyrotropin β subunit. Following the 339 nucleotide β subunit coding sequence, no termination codon is encountered for another 15 nucleotides. Thus, the cDNA codes for a thyrotropin β subunit containing an additional 5 amino acids at the COOH terminus. The cDNA also contains 82 nucleotides of 3' untranslated sequence followed by a short poly(A) segment. Comparison of the bovine cDNA sequence to the recently described mouse thyrotropin β subunit cDNA sequence reveals considerable homology throughout the coding sequence, including the COOH-terminal extension. These findings suggest the possibility that a thyrotropin β subunit precursor is processed at both the NH2 and COOH termini.

Original languageEnglish (US)
Pages (from-to)5024-5027
Number of pages4
JournalJournal of Biological Chemistry
Volume259
Issue number8
Publication statusPublished - 1984
Externally publishedYes

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ASJC Scopus subject areas

  • Biochemistry

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