7yqq

Crystal Structure of Xcc NAMPT and its complex with NMN

spinqualitylabelsall models 7yqq, resolution 2.22Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7yqq is a 2 chain structure with sequence from Xanthomonas campestris pv. campestris. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.22Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0A0H2X5R2_XANC8 Publication Abstract from PubMed Nicotinamide phosphoribosyltransferase (NAMPT) plays an important role in the biosynthesis of nicotinamide adenine dinucleotide (NAD(+)) via the nicotinamide (NAM) salvage pathway. While the structural biochemistry of eukaryote NAMPT has been well studied, the catalysis mechanism of prokaryote NAMPT at the molecular level remains largely unclear. Here, we demonstrated the NAMPT-mediated salvage pathway is functional in the Gram-negative phytopathogenic bacterium Xanthomonas campestris pv. campestris (Xcc) for the synthesis of NAD(+), and the enzyme activity of NAMPT in this bacterium is significantly higher than that of human NAMPT in vitro. Our structural analyses of Xcc NAMPT, both in isolation and in complex with either the substrate NAM or the product nicotinamide mononucleotide (NMN), uncovered significant details of substrate recognition. Specifically, we revealed the presence of a NAM binding tunnel that connects the active site, and this tunnel is essential for both catalysis and inhibitor binding. We further demonstrated that NAM binding in the tunnel has a positive cooperative effect with NAM binding in the catalytic site. Additionally, we discovered that phosphorylation of the His residue at position 229 enhances the substrate binding affinity of Xcc NAMPT and is important for its catalytic activity. This work reveals the importance of NAMPT in bacterial NAD(+) synthesis and provides insights into the substrate recognition and the catalytic mechanism of bacterial type II phosphoribosyltransferases. Structural insights into Xanthomonas campestris pv. campestris NAD(+) biosynthesis via the NAM salvage pathway.,Xu G, Ma J, Fang Q, Peng Q, Jiao X, Hu W, Zhao Q, Kong Y, Liu F, Shi X, Tang DJ, Tang JL, Ming Z Commun Biol. 2024 Mar 1;7(1):255. doi: 10.1038/s42003-024-05921-3. PMID:38429435 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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