1OPR image
Deposition Date 1995-01-06
Release Date 1996-01-06
Last Version Date 2024-02-14
Entry Detail
PDB ID:
1OPR
Keywords:
Title:
THE CRYSTAL STRUCTURE OF THE OROTATE PHOSPHORIBOSYLTRANSFERASE COMPLEXED WITH OROTATE AND ALPHA-D-5-PHOSPHORIBOSYL-1-PYROPHOSPHATE
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.30 Å
R-Value Work:
0.18
Space Group:
P 41 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:OROTATE PHOSPHORIBOSYLTRANSFERASE
Gene (Uniprot):pyrE
Chain IDs:A
Chain Length:213
Number of Molecules:1
Biological Source:Salmonella typhimurium
Primary Citation
The crystal structure of the orotate phosphoribosyltransferase complexed with orotate and alpha-D-5-phosphoribosyl-1-pyrophosphate.
Biochemistry 34 10744 10754 (1995)
PMID: 7545004 DOI: 10.1021/bi00034a006

Abstact

The three-dimensional structure of Salmonella typhimurium orotate phosphoribosyltransferase (OPRTase) in complex with the ribose 5-phosphate donor alpha-D-5--phosphoribosyl-1-pyrophosphate (PRPP) and the nitrogenous base orotic acid has been solved and refined with X-ray diffraction data extending to 2.3 A resolution to a crystallographic R-factor of 18.7%. The complex was generated by carrying out catalysis in the crystal. Comparison of this structure with the previously reported structure of the orotidine 5'-monophosphate (OMP) complex [Scapin, G., Grubmeyer, C., and Sacchettini, J. C. (1994) Biochemistry 33, 1287-1294] revealed that the enzyme backbone undergoes only small movements. The most significant differences occur near the active site, at Ala71-Gly74, with the largest difference involving the side chains of Lys73, Val127-Ala133, the 5'-phosphate binding loop, and a long, solvent-exposed loop at the dimer interface. The position of the ribose moiety is, on the other hand, very different in the OMP and PRPP.orotate complexes, with its anomeric carbon moving approximately 7 A across the binding cavity. In the PRPP.orotate complex the highly conserved acidic side chain of Asp124 interacts with the ribose of PRPP, whereas there are no interactions of this aspartate with the substrate in the OMP complex.

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Primary Citation of related structures