1vlp
From Proteopedia
Crystal structure of a putative nicotinate phosphoribosyltransferase (yor209c, npt1) from saccharomyces cerevisiae at 1.75 A resolution
Structural highlights
FunctionNPT1_YEAST Essential for growth under anaerobic conditions.[1] Catalyzes the synthesis of beta-nicotinate D-ribonucleotide from nicotinate and 5-phospho-D-ribose 1-phosphate at the expense of ATP (By similarity).[2] 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 PubMedNicotinamide adenine dinucleotide (NAD) is an essential cofactor for cellular redox reactions and can act as an important substrate in numerous biological processes. As a result, nature has evolved multiple biosynthetic pathways to meet this high chemical demand. In Saccharomyces cerevisiae, the NAD salvage pathway relies on the activity of nicotinic acid phosphoribosyltransferase (NAPRTase), a member of the phosphoribosyltransferase (PRTase) superfamily. Here, we report the structure of a eukaryotic (yeast) NAPRTase at 1.75 A resolution (locus name: YOR209C, gene name: NPT1). The structure reveals a two-domain fold that resembles the architecture of quinolinic acid phosphoribosyltransferases (QAPRTases), but with completely different dispositions that provide evidence for structural heterogeneity among the Type II PRTases. The identification of a third domain in NAPRTases provides a structural basis and possible mechanism for the functional modulation of this family of enzymes by ATP. The structure of a eukaryotic nicotinic acid phosphoribosyltransferase reveals structural heterogeneity among type II PRTases.,Chappie JS, Canaves JM, Han GW, Rife CL, Xu Q, Stevens RC Structure. 2005 Sep;13(9):1385-96. PMID:16154095[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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