View source for 2yxt


==Human Pyridoxal Kinase==
<StructureSection load='2yxt' size='340' side='right' caption='[[2yxt]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2yxt]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2YXT OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2YXT FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=MPD:(4S)-2-METHYL-2,4-PENTANEDIOL'>MPD</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1lhp|1lhp]], [[2yxu|2yxu]]</td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">PDXK, PKH, PNK ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Pyridoxal_kinase Pyridoxal kinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.1.35 2.7.1.35] </span></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2yxt FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2yxt OCA], [http://pdbe.org/2yxt PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2yxt RCSB], [http://www.ebi.ac.uk/pdbsum/2yxt PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2yxt ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/PDXK_HUMAN PDXK_HUMAN]] Required for synthesis of pyridoxal-5-phosphate from vitamin B6. 
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/yx/2yxt_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=2yxt ConSurf].
<div style="clear:both"></div>
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== Publication Abstract from PubMed ==
Pyridoxal kinase catalyzes the transfer of a phosphate group from ATP to the 5' alcohol of pyridoxine, pyridoxamine, and pyridoxal. In this work, kinetic studies were conducted to examine monovalent cation dependence of human pyridoxal kinase kinetic parameters. The results show that hPLK affinity for ATP and PL is increased manyfold in the presence of K(+) when compared to Na(+); however, the maximal activity of the Na(+) form of the enzyme is more than double the activity in the presence of K(+). Other monovalent cations, Li(+), Cs(+), and Rb(+) do not show significant activity. We have determined the crystal structure of hPLK in the unliganded form, and in complex with MgATP to 2.0 and 2.2 A resolution, respectively. Overall, the two structures show similar open conformation, and likely represent the catalytically idle state. The crystal structure of the MgATP complex also reveals Mg(2+) and Na(+) acting in tandem to anchor the ATP at the active site. Interestingly, the active site of hPLK acts as a sink to bind several molecules of MPD. The features of monovalent and divalent metal cation binding, active site structure, and vitamin B6 specificity are discussed in terms of the kinetic and structural studies, and are compared with those of the sheep and Escherichia coli enzymes.

Crystal Structure of human pyridoxal kinase: structural basis of M(+) and M(2+) activation.,Musayev FN, di Salvo ML, Ko TP, Gandhi AK, Goswami A, Schirch V, Safo MK Protein Sci. 2007 Oct;16(10):2184-94. Epub 2007 Aug 31. PMID:17766369<ref>PMID:17766369</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 2yxt" style="background-color:#fffaf0;"></div>

==See Also==
*[[Pyridoxal kinase|Pyridoxal kinase]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Human]]
[[Category: Pyridoxal kinase]]
[[Category: Ko, T P]]
[[Category: Musayev, F N]]
[[Category: Safo, M K]]
[[Category: Schirch, V]]
[[Category: Beta sheet with alpha helix]]
[[Category: Metal ion]]
[[Category: Transferase]]