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==N-acetylhexosamine 1-phosphate kinase in complex with GlcNAc-1-phosphate==
<StructureSection load='4oco' size='340' side='right'caption='[[4oco]], [[Resolution|resolution]] 2.16&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4oco]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Bifidobacterium_longum Bifidobacterium longum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4OCO OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4OCO 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]] 2.16&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GN1:2-(ACETYLAMINO)-2-DEOXY-1-O-PHOSPHONO-ALPHA-D-GLUCOPYRANOSE'>GN1</scene>, <scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</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=4oco FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4oco OCA], [https://pdbe.org/4oco PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4oco RCSB], [https://www.ebi.ac.uk/pdbsum/4oco PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4oco ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/NAHK_BIFL2 NAHK_BIFL2] Phosphorylates both N-acetylglucosamine (GlcNAc) and N-acetylgalactosamine (GalNAc) at similar rates. Involved in the lacto-N-biose I/galacto-N-biose (LNB/GNB) degradation pathway, which is important for host intestinal colonization by bifidobacteria. Also accepts GTP and ITP as phosphate donors. In vitro, can phosphorylate several GlcNAc and GalNAc derivatives.<ref>PMID:17720833</ref> <ref>PMID:19436918</ref> <ref>PMID:19683921</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Utilization of N-acetylhexosamine in bifidobacteria requires the specific lacto-N-biose/galacto-N-biose pathway, a pathway differing from the Leloir pathway while establishing symbiosis between humans and bifidobacteria. The gene lnpB in the pathway encodes a novel hexosamine kinase NahK, which catalyzes the formation of N-acetylhexosamine 1-phosphate (GlcNAc-1P/GalNAc-1P). In this report, seven three-dimensional structures of NahK in complex with GlcNAc, GalNAc, GlcNAc-1P, GlcNAc/AMPPNP and GlcNAc-1P/ADP from both Bifidobacterium longum (JCM1217) and B. infantis (ATCC15697) were solved at resolutions of 1.5-2.2 A. NahK is a monomer in solution, and its polypeptide folds in a crescent-like architecture subdivided into two domains by a deep cleft. The NahK structures presented here represent the first multiple reaction complexes of the enzyme. This structural information reveals the molecular basis for the recognition of the given substrates and products, GlcNAc/GalNAc, GlcNAc-1P/GalNAc-1P, ATP/ADP and Mg(2+), and provides insights into the catalytic mechanism, enabling NahK and mutants thereof to form a choice of biocatalysts for enzymatic and chemoenzymatic synthesis of carbohydrates.

Insights into the binding specificity and catalytic mechanism of N-acetylhexosamine 1-phosphate kinases through multiple reaction complexes.,Wang KC, Lyu SY, Liu YC, Chang CY, Wu CJ, Li TL Acta Crystallogr D Biol Crystallogr. 2014 May;70(Pt 5):1401-10. doi:, 10.1107/S1399004714004209. Epub 2014 Apr 30. PMID:24816108<ref>PMID:24816108</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4oco" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Bifidobacterium longum]]
[[Category: Large Structures]]
[[Category: Chang CY]]
[[Category: Li TL]]
[[Category: Liu YC]]
[[Category: Lyu SY]]
[[Category: Wang KC]]
[[Category: Wu CJ]]