4ocj

N-acetylhexosamine 1-phosphate kinase in complex with GlcNAc

spinqualitylabelsall models 4ocj, resolution 1.57Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4ocj is a 1 chain structure with sequence from Bifidobacterium longum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.571Å Ligands: MSE, NA, NDG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function 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. 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 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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