3c2e | pdb_00003c2e

Crystal structure at 1.9A of the apo quinolinate phosphoribosyl transferase (BNA6) from Saccharomyces cerevisiae

spinqualitylabelsall models 3c2e, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3c2e is a 1 chain structure with sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Related: 3c2d, 3c2f Gene: BNA6, QPT1 (Saccharomyces cerevisiae) Activity: Nicotinate-nucleotide diphosphorylase (carboxylating), with EC number 2.4.2.19 Resources: FirstGlance, OCA, RCSB, PDBsum Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Quinolinic acid phosphoribosyl transferase (QAPRTase, EC 2.4.2.19) is a 32 kDa enzyme encoded by the BNA6 gene in yeast and catalyzes the formation of nicotinate mononucleotide from quinolinate and 5-phosphoribosyl-1-pyrophosphate (PRPP). QAPRTase plays a key role in the tryptophan degradation pathway via kynurenine, leading to the de novo biosynthesis of NAD (+) and clearing the neurotoxin quinolinate. To improve our understanding of the specificity of the eukaryotic enzyme and the course of events associated with catalysis, we have determined the crystal structures of the apo and singly bound forms with the substrates quinolinate and PRPP. This reveals that the enzyme folds in a manner similar to that of various prokaryotic forms which are approximately 30% identical in sequence. In addition, the structure of the Michaelis complex is approximated by PRPP and the quinolinate analogue phthalate bound to the active site. These results allow insight into the kinetic mechanism of QAPRTase and provide an understanding of structural diversity in the active site of the Saccharomyces cerevisiae enzyme when compared to prokaryotic homologues. Comprehensive X-ray Structural Studies of the Quinolinate Phosphoribosyl Transferase (BNA6) from Saccharomyces cerevisiae.,di Luccio E, Wilson DK Biochemistry. 2008 Apr 1;47(13):4039-50. Epub 2008 Mar 6. PMID:18321072 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Phosphoribosyltransferase

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