View source for 7yqr


==Crystal Structure of Xcc NAMPT and its complex with NAM==
<StructureSection load='7yqr' size='340' side='right'caption='[[7yqr]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7yqr]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Xanthomonas_campestris_pv._campestris Xanthomonas campestris pv. campestris]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7YQR OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7YQR FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2&#8491;</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=7yqr FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7yqr OCA], [https://pdbe.org/7yqr PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7yqr RCSB], [https://www.ebi.ac.uk/pdbsum/7yqr PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7yqr ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A0A0H2X5R2_XANC8 A0A0H2X5R2_XANC8] 
<div style="background-color:#fffaf0;">
== 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<ref>PMID:38429435</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7yqr" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Xanthomonas campestris pv. campestris]]
[[Category: Ming ZH]]
[[Category: Xu GL]]