1E7w image
Deposition Date 2000-09-11
Release Date 2001-09-06
Last Version Date 2024-05-08
Entry Detail
PDB ID:
1E7W
Keywords:
Title:
One active site, two modes of reduction correlate the mechanism of leishmania pteridine reductase with pterin metabolism and antifolate drug resistance in trpanosomes
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.75 Å
R-Value Free:
0.24
R-Value Work:
0.19
Space Group:
P 21 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:PTERIDINE REDUCTASE
Chain IDs:A, B
Chain Length:291
Number of Molecules:2
Biological Source:LEISHMANIA MAJOR
Primary Citation
Pteridine Reductase Mechanism Correlates Pterin Metabolism with Drug Resistance in Trypanosomatid Parasites.
Nat.Struct.Biol. 8 521 ? (2001)
PMID: 11373620 DOI: 10.1038/88584

Abstact

Pteridine reductase (PTR1) is a short-chain reductase (SDR) responsible for the salvage of pterins in parasitic trypanosomatids. PTR1 catalyzes the NADPH-dependent two-step reduction of oxidized pterins to the active tetrahydro-forms and reduces susceptibility to antifolates by alleviating dihydrofolate reductase (DHFR) inhibition. Crystal structures of PTR1 complexed with cofactor and 7,8-dihydrobiopterin (DHB) or methotrexate (MTX) delineate the enzyme mechanism, broad spectrum of activity and inhibition by substrate or an antifolate. PTR1 applies two distinct reductive mechanisms to substrates bound in one orientation. The first reduction uses the generic SDR mechanism, whereas the second shares similarities with the mechanism proposed for DHFR. Both DHB and MTX form extensive hydrogen bonding networks with NADP(H) but differ in the orientation of the pteridine.

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Primary Citation of related structures