2ddm | pdb_00002ddm

Crystal Structure of Pyridoxal Kinase from the Escherichia coli PdxK gene at 2.1 A resolution

spinqualitylabelsall models 2ddm, resolution 2.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2ddm is a 2 chain structure with sequence from "bacillus_coli"_migula_1895 "bacillus coli" migula 1895. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: TRS Related: 2ddo, 2ddw Gene: pdxK ("Bacillus coli" Migula 1895) Activity: Pyridoxal kinase, with EC number 2.7.1.35 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [PDXK_ECOLI] Phosphorylates B6 vitamers; functions in a salvage pathway. Uses pyridoxal, pyridoxine, and pyridoxamine as substrates. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The pdxK and pdxY genes have been found to code for pyridoxal kinases, enzymes involved in the pyridoxal phosphate salvage pathway. Two pyridoxal kinase structures have recently been published, including Escherichia coli pyridoxal kinase 2 (ePL kinase 2) and sheep pyridoxal kinase, products of the pdxY and pdxK genes, respectively. We now report the crystal structure of E. coli pyridoxal kinase 1 (ePL kinase 1), encoded by a pdxK gene, and an isoform of ePL kinase 2. The structures were determined in the unliganded and binary complexes with either MgATP or pyridoxal to 2.1-, 2.6-, and 3.2-A resolutions, respectively. The active site of ePL kinase 1 does not show significant conformational change upon binding of either pyridoxal or MgATP. Like sheep PL kinase, ePL kinase 1 exhibits a sequential random mechanism. Unlike sheep pyridoxal kinase, ePL kinase 1 may not tolerate wide variation in the size and chemical nature of the 4' substituent on the substrate. This is the result of differences in a key residue at position 59 on a loop (loop II) that partially forms the active site. Residue 59, which is His in ePL kinase 1, interacts with the formyl group at C-4' of pyridoxal and may also determine if residues from another loop (loop I) can fill the active site in the absence of the substrate. Both loop I and loop II are suggested to play significant roles in the functions of PL kinases. Crystal structure of pyridoxal kinase from the Escherichia coli pdxK gene: implications for the classification of pyridoxal kinases.,Safo MK, Musayev FN, di Salvo ML, Hunt S, Claude JB, Schirch V J Bacteriol. 2006 Jun;188(12):4542-52. PMID:16740960 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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