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. 1983 Apr;80(8):2122–2126. doi: 10.1073/pnas.80.8.2122

Cloning of cDNA encoding the pre-beta subunit of mouse thyrotropin.

J A Gurr, J F Catterall, I A Kourides
PMCID: PMC393769  PMID: 6572965

Abstract

Double-stranded cDNA was synthesized from sucrose gradient-purified poly(A)+ mRNA from a mouse thyrotropic tumor, inserted into the Pst I site of plasmid pBR322 by using poly(dC) . poly(dG) homopolymeric extensions, and cloned in Escherichia coli RRI. Plasmids containing cDNA sequences coding for the beta subunit of thyrotropin (TSH) were identified by cell-free translation of hybrid-selected mRNA and immunoprecipitation with specific antibody to TSH beta subunit. Determination of the nucleotide sequence of one cDNA, 595 base pairs in length, allowed us to deduce the entire amino acid sequence of the mouse TSH beta subunit. The pre-beta subunit contains a 20-amino acid amino-terminal signal sequence followed by a 118-amino acid mature TSH beta subunit. There is 85-90% homology in amino acid sequence between mouse TSH beta subunit and subunits from man, pig, and cow; however, the mouse subunit contains an additional 5 or 6 amino acids at its carboxyl terminus compared to the bovine or human and pig subunits, respectively. TSH beta-subunit mRNA from mouse thyrotropic tumor was estimated to be 750 nucleotides in length by hybridization with labeled TSH beta-subunit cDNA.

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Selected References

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