7PXX
The crystal structure of Leishmania major Pteridine Reductase 1 in complex with substrate folic acid
Summary for 7PXX
| Entry DOI | 10.2210/pdb7pxx/pdb |
| Descriptor | Pteridine reductase 1, FOLIC ACID, NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE, ... (8 entities in total) |
| Functional Keywords | enzyme-substrate complex, rossmann fold, cofactor, oxidoreductase |
| Biological source | Leishmania major More |
| Total number of polymer chains | 4 |
| Total formula weight | 127348.43 |
| Authors | Di Pisa, F.,Dello Iacono, L.,Mangani, S. (deposition date: 2021-10-08, release date: 2022-04-06, Last modification date: 2024-01-31) |
| Primary citation | Dello Iacono, L.,Di Pisa, F.,Mangani, S. Crystal structure of the ternary complex of Leishmania major pteridine reductase 1 with the cofactor NADP + /NADPH and the substrate folic acid. Acta Crystallogr.,Sect.F, 78:170-176, 2022 Cited by PubMed Abstract: Pteridine reductase 1 (PTR1) is a key enzyme of the folate pathway in protozoan parasites of the genera Leishmania and Trypanosoma and is a valuable drug target for tropical diseases. This enzyme is able to catalyze the NADPH-dependent reduction of both conjugated (folate) and unconjugated (biopterin) pterins to their tetrahydro forms, starting from oxidized- or dihydro-state substrates. The currently available X-ray structures of Leishmania major PTR1 (LmPTR1) show the enzyme in its unbound, unconjugated substrate-bound (with biopterin derivatives) and inhibitor-bound forms. However, no structure has yet been determined of LmPTR1 bound to a conjugated substrate. Here, the high-resolution crystal structure of LmPTR1 in complex with folic acid is presented and the intermolecular forces that drive the binding of the substrate in the catalytic pocket are described. By expanding the collection of LmPTR1 structures in complex with process intermediates, additional insights into the active-site rearrangements that occur during the catalytic process are provided. In contrast to previous structures with biopterin derivatives, a small but significant difference in the orientation of Asp181 and Tyr194 of the catalytic triad is found. This feature is shared by PTR1 from T. brucei (TbPTR1) in complex with the same substrate molecule and may be informative in deciphering the importance of such residues at the beginning of the catalytic process. PubMed: 35400669DOI: 10.1107/S2053230X22002795 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (1.81 Å) |
Structure validation
Download full validation report
