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1opr

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{{STRUCTURE_1opr| PDB=1opr | SCENE= }}
{{STRUCTURE_1opr| PDB=1opr | SCENE= }}
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'''THE CRYSTAL STRUCTURE OF THE OROTATE PHOSPHORIBOSYLTRANSFERASE COMPLEXED WITH OROTATE AND ALPHA-D-5-PHOSPHORIBOSYL-1-PYROPHOSPHATE'''
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===THE CRYSTAL STRUCTURE OF THE OROTATE PHOSPHORIBOSYLTRANSFERASE COMPLEXED WITH OROTATE AND ALPHA-D-5-PHOSPHORIBOSYL-1-PYROPHOSPHATE===
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==Overview==
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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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{{ABSTRACT_PUBMED_7545004}}
==About this Structure==
==About this Structure==
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[[Category: Scapin, G.]]
[[Category: Scapin, G.]]
[[Category: Transferase]]
[[Category: Transferase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 09:50:45 2008''

Revision as of 06:50, 28 July 2008

Image:1opr.png

Template:STRUCTURE 1opr

THE CRYSTAL STRUCTURE OF THE OROTATE PHOSPHORIBOSYLTRANSFERASE COMPLEXED WITH OROTATE AND ALPHA-D-5-PHOSPHORIBOSYL-1-PYROPHOSPHATE

Template:ABSTRACT PUBMED 7545004

About this Structure

1OPR is a Single protein structure of sequence from Salmonella typhimurium. Full crystallographic information is available from OCA.

Reference

The crystal structure of the orotate phosphoribosyltransferase complexed with orotate and alpha-D-5-phosphoribosyl-1-pyrophosphate., Scapin G, Ozturk DH, Grubmeyer C, Sacchettini JC, Biochemistry. 1995 Aug 29;34(34):10744-54. PMID:7545004

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