1lhr

<table><tr><td colspan='2'>[[1lhr]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Ovis_ammon_aries Ovis ammon aries]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1LHR OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1LHR FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ATP:ADENOSINE-5-TRIPHOSPHATE'>ATP</scene>, <scene name='pdbligand=K:POTASSIUM+ION'>K</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>

<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1lhp|1lhp]]</div></td></tr>

<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Pyridoxal_kinase Pyridoxal kinase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.1.35 2.7.1.35] </span></td></tr>

[[https://www.uniprot.org/uniprot/PDXK_SHEEP PDXK_SHEEP]] Required for synthesis of pyridoxal-5-phosphate from vitamin B6.

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== Publication Abstract from PubMed ==

The three-dimensional structures of brain pyridoxal kinase and its complex with the nucleotide ATP have been elucidated in the dimeric form at 2.1 and 2.6 A, respectively. Results have shown that pyridoxal kinase, as an enzyme obeying random sequential kinetics in catalysis, does not possess a lid shape structure common to all kinases in the ribokinase superfamily. This finding has been shown to be in line with the condition that pyridoxal kinase binds substrates with variable sizes of chemical groups at position 4 of vitamin B(6) and its derivatives. In addition, the enzyme contains a 12-residue peptide loop in the active site for the prevention of premature hydrolysis of ATP. Conserved amino acid residues Asp(118) and Tyr(127) in the peptide loop could be moved to a position covering the nucleotide after its binding so that its chance to hydrolyze in the aqueous environment of the active site was reduced. With respect to the evolutionary trend of kinase enzymes, the existence of this loop in pyridoxal kinase could be classified as an independent category in the ribokinase superfamily according to the structural feature found and mechanism followed in catalysis.

Crystal structure of brain pyridoxal kinase, a novel member of the ribokinase superfamily.,Li MH, Kwok F, Chang WR, Lau CK, Zhang JP, Lo SC, Jiang T, Liang DC J Biol Chem. 2002 Nov 29;277(48):46385-90. Epub 2002 Sep 15. PMID:12235162<ref>PMID:12235162</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

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== References ==

<references/>

[[Category: Ovis ammon aries]]

[[Category: Pyridoxal kinase]]

[[Category: Jiang, T]]

[[Category: Li, M H]]

[[Category: Liang, D C]]

[[Category: Transferase]]