Pteridine reductase

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Pteridine reductase

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In enzymology, a pteridine reductase (EC 1.5.1.33) is an enzyme that catalyzes the chemical reaction

5,6,7,8-tetrahydrobiopterin + 2 NADP⁺

\rightleftharpoons

biopterin + 2 NADPH + 2 H⁺

Thus, the two substrates of this enzyme are 5,6,7,8-tetrahydrobiopterin and NADP⁺, whereas its 3 products are biopterin, NADPH, and H⁺.

This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-NH group of donors with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is 5,6,7,8-tetrahydrobiopterin:NADP+ oxidoreductase. Other names in common use include PTR1, and pteridine reductase 1.

Structural studies

As of late 2007, 7 structures have been solved for this class of enzymes, with PDB accession codes 1W0C, 2BF7, 2BFA, 2BFM, 2BFO, 2BFP, and 2C7V.

References

Nare B, Hardy LW, Beverley SM (1997). "The roles of pteridine reductase 1 and dihydrofolate reductase-thymidylate synthase in pteridine metabolism in the protozoan parasite Leishmania major". J. Biol. Chem. 272 (21): 13883–91. doi:10.1074/jbc.272.21.13883. PMID 9153248.
Gourley DG, Schüttelkopf AW, Leonard GA, Luba J, Hardy LW, Beverley SM, Hunter WN (2001). "Pteridine reductase mechanism correlates pterin metabolism with drug resistance in trypanosomatid parasites". Nat. Struct. Biol. 8 (6): 521–5. doi:10.1038/88584. PMID 11373620. S2CID 32379320.
Fitzpatrick PF (2000). "The Aromatic Amino Acid Hydroxylases". Advances in Enzymology and Related Areas of Molecular Biology. Advances in Enzymology - and Related Areas of Molecular Biology. Vol. 74. pp. 235–94. doi:10.1002/9780470123201.ch6. ISBN 978-0-470-12320-1. PMID 10800597. {{cite book}}: |journal= ignored (help)

v t e Oxidoreductases: CH-NH (EC 1.5)
1.5.1: NAD or NADP acceptor	Dihydrofolate reductase Saccharopine dehydrogenase Methylenetetrahydrofolate reductase
1.5.3: oxygen acceptor	Dihydrobenzophenanthridine oxidase Sarcosine oxidase Proline oxidase
1.5.5: quinone acceptor	Electron-transferring-flavoprotein dehydrogenase
1.5.99	Sarcosine dehydrogenase Cytokinin dehydrogenase

v t e Enzymes
Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Diffusion-limited enzyme Cofactor Enzyme catalysis
Regulation	Allosteric regulation Cooperativity Enzyme inhibitor Enzyme activator
Classification	EC number Enzyme superfamily Enzyme family List of enzymes
Kinetics	Enzyme kinetics Eadie–Hofstee diagram Hanes–Woolf plot Lineweaver–Burk plot Michaelis–Menten kinetics
Types	EC1 Oxidoreductases (list) EC2 Transferases (list) EC3 Hydrolases (list) EC4 Lyases (list) EC5 Isomerases (list) EC6 Ligases (list) EC7 Translocases (list)

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