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- *************************************
- * Dihydrofolate reductase signature *
- *************************************
-
- Dihydrofolate reductases (EC 1.5.1.3) [1] are ubiquitous enzymes which
- catalyze the reduction of folic acid into tetrahydrofolic acid. They can be
- inhibited by a number of antagonists such as trimethroprim and methotrexate
- which are used as antibacterial or anticancerous agents. We have derived a
- signature pattern from a region in the N-terminal part of these enzymes, which
- includes a conserved Pro-Trp dipeptide; the tryptophan has been shown [2] to
- be involved in the binding of substrate by the enzyme.
-
- -Consensus pattern: [LIF]-G-x(4)-[LIVMF]-P-W
- -Sequences known to belong to this class detected by the pattern: ALL, except
- for type II bacterial, plasmid-encoded, dihydrofolate reductases which do not
- belong to the same class of enzymes.
- -Other sequence(s) detected in SWISS-PROT: 21.
- -Last update: April 1990 / Pattern and text revised.
-
- [ 1] Harpers' Review of Biochemistry, Lange, Los Altos (1985).
- [ 2] Bolin J.T., Filman D.J., Matthews D.A., Hamlin R.C., Kraut J.
- J. Biol. Chem. 257:13650-13662(1982).
-