View source for 7bvk


==UDP-N-acetylglucosamine 3-dehydrogenase GnnA from Acidithiobacillus ferrooxidans (P212121)==
<StructureSection load='7bvk' size='340' side='right'caption='[[7bvk]], [[Resolution|resolution]] 2.70&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7bvk]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Acidithiobacillus_ferrooxidans_ATCC_23270 Acidithiobacillus ferrooxidans ATCC 23270]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7BVK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7BVK 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]] 2.7&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NAD:NICOTINAMIDE-ADENINE-DINUCLEOTIDE'>NAD</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></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=7bvk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7bvk OCA], [https://pdbe.org/7bvk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7bvk RCSB], [https://www.ebi.ac.uk/pdbsum/7bvk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7bvk ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/B7JA34_ACIF2 B7JA34_ACIF2] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Lipopolysaccharide (LPS) is a crucial component in the outer membrane of Gram-negative bacteria that contributes to both pathogenicity as well as immunity against pathogenic bacteria. Typical LPS contains GlcN disaccharide as the core of lipid A. However, some bacteria such as Acidithiobacillus ferrooxidans and Leptospira interrogans contain GlcN3N in lipid A instead. This modification has been shown to dampen the host immune response and increase resistance to antimicrobial peptides. Therefore, investigation of the enzymes responsible for the biosynthesis of GlcN3N has promising applications in the development of vaccines, antibiotics, or usage of the enzymes in chemoenzymatic synthesis of modified LPS. Here, we describe biochemical and structural investigation of GnnA from A. ferrooxidans (AfGnnA) that is responsible for oxidation of UDP-GlcNAc, which subsequently undergoes transamination to produce UDP-GlcNAc3N as a precursor for LPS biosynthesis. AfGnnA is specific for NAD(+) and UDP-GlcNAc. The crystal structures of AfGnnA in combination with molecular dynamics simulation and mutational analysis suggest the substrate recognition mode and the catalytic mechanism. K91 or H164 is a potential catalytic base in the oxidation reaction. The results will not only provide insights into the biosynthesis of unusual LPS but will also lay the foundation for development of more immunogenic vaccines, novel antibiotics, or utilization of GnnA in the synthesis of UDP-sugars or modified LPS.

Biochemical and Structural Investigation of GnnA in the Lipopolysaccharide Biosynthesis Pathway of Acidithiobacillus ferrooxidans.,Manissorn J, Sitthiyotha T, Montalban JRE, Chunsrivirot S, Thongnuek P, Wangkanont K ACS Chem Biol. 2020 Dec 18;15(12):3235-3243. doi: 10.1021/acschembio.0c00791., Epub 2020 Nov 17. PMID:33200610<ref>PMID:33200610</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7bvk" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Acidithiobacillus ferrooxidans ATCC 23270]]
[[Category: Large Structures]]
[[Category: Wangkanont K]]