Dihydrofolate Reductase

Supporting information

Dihydrofolate reductase (DHFR) is a member of the reductase family of enzymes that is ubiquitously expressed in all organisms. It catalyzes tetrahydrofolate regeneration by reduction of dihydrofolate, using NADPH as a cofactor. Tetrahydrofolate is essential for de novo purine and thymidylate synthesis, hence DHFR has a critical role in cell growth and proliferation.

DHFR is the target for many cancer therapies including methotrexate because it is a key enzyme in cell replication. Basal and regulated DHFR gene expression is controlled by Sp1 and E2F family transcription factors respectively and levels of this enzyme peak at the G1/S cell cycle boundary. Autoregulation, through DHFR-RNA interactions, has also been reported. The human gene encoding this enzyme is localized to 5q11.2-13.2.

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Species Gene Symbol Gene Accession No. Protein Accession No.
Human DHFR NM_000791 P00374
Mouse Dhfr NM_010049 P00375
Rat Dhfr NM_130400 Q920D2

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