Molecular Biology and Evolution, Vol 3, 313-321, Copyright © 1986 by Society for Molecular Biology and Evolution
SM Perryman, C Rossana, TL Deng, EF Vanin and LF Johnson
We report the nucleotide sequence of a cloned cDNA, pMTS-3, that contains a
1-kb insert corresponding to mouse thymidylate synthase (E.C. 2.1.1.45).
The open reading frame of 921 nucleotides from the first AUG to the
termination codon specifies a protein with a molecular mass of 34,962
daltons. The predicted amino acid sequence is 90% identical with that of
the human enzyme. The mouse sequence also has an extremely high degree of
similarity (as much as 55% identity) with prokaryotic thymidylate synthase
sequences, indicating that thymidylate synthase is among the most highly
conserved proteins studied to date. The similarity is especially pronounced
(as much as 80% identity) in the 44-amino-acid region encompassing the
binding site for deoxyuridylic acid. The cDNA sequence also suggests that
mouse thymidylate synthase mRNA lacks a 3' untranslated region, since the
termination codon, UAA, is followed immediately by a poly(A) segment.
ORIGINAL ARTICLE
Sequence of a cDNA for mouse thymidylate synthase reveals striking similarity with the prokaryotic enzyme
Department of Biochemistry, Ohio State University, Columbus 43210.
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