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1upf

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{{STRUCTURE_1upf| PDB=1upf | SCENE= }}
{{STRUCTURE_1upf| PDB=1upf | SCENE= }}
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'''STRUCTURE OF THE URACIL PHOSPHORIBOSYLTRANSFERASE, MUTANT C128V BOUND TO THE DRUG 5-FLUOROURACIL'''
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===STRUCTURE OF THE URACIL PHOSPHORIBOSYLTRANSFERASE, MUTANT C128V BOUND TO THE DRUG 5-FLUOROURACIL===
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==Overview==
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Uracil phosphoribosyltransferase (UPRTase) catalyzes the transfer of a ribosyl phosphate group from alpha-D-5-phosphoribosyl-1-pyrophosphate to the N1 nitrogen of uracil. The UPRTase from the opportunistic pathogen Toxoplasma gondii is a rational target for antiparasitic drug design. To aid in structure-based drug design studies against toxoplasmosis, the crystal structures of the T.gondii apo UPRTase (1.93 A resolution), the UPRTase bound to its substrate, uracil (2.2 A resolution), its product, UMP (2.5 A resolution), and the prodrug, 5-fluorouracil (2.3 A resolution), have been determined. These structures reveal that UPRTase recognizes uracil through polypeptide backbone hydrogen bonds to the uracil exocyclic O2 and endocyclic N3 atoms and a backbone-water-exocyclic O4 oxygen hydrogen bond. This stereochemical arrangement and the architecture of the uracil-binding pocket reveal why cytosine and pyrimidines with exocyclic substituents at ring position 5 larger than fluorine, including thymine, cannot bind to the enzyme. Strikingly, the T. gondii UPRTase contains a 22 residue insertion within the conserved PRTase fold that forms an extended antiparallel beta-arm. Leu92, at the tip of this arm, functions to cap the active site of its dimer mate, thereby inhibiting the escape of the substrate-binding water molecule.
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{{ABSTRACT_PUBMED_9628859}}
==About this Structure==
==About this Structure==
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[[Category: Phosphoribosyltransferase]]
[[Category: Phosphoribosyltransferase]]
[[Category: Transferase]]
[[Category: Transferase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 04:29:51 2008''

Revision as of 01:29, 29 July 2008

Image:1upf.png

Template:STRUCTURE 1upf

STRUCTURE OF THE URACIL PHOSPHORIBOSYLTRANSFERASE, MUTANT C128V BOUND TO THE DRUG 5-FLUOROURACIL

Template:ABSTRACT PUBMED 9628859

About this Structure

1UPF is a Single protein structure of sequence from Toxoplasma gondii. Full crystallographic information is available from OCA.

Reference

Crystal structures of Toxoplasma gondii uracil phosphoribosyltransferase reveal the atomic basis of pyrimidine discrimination and prodrug binding., Schumacher MA, Carter D, Scott DM, Roos DS, Ullman B, Brennan RG, EMBO J. 1998 Jun 15;17(12):3219-32. PMID:9628859

Page seeded by OCA on Tue Jul 29 04:29:51 2008

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