1pie: Difference between revisions
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==Crystal Structure of Lactococcus lactis Galactokinase Complexed with Galactose== | ==Crystal Structure of Lactococcus lactis Galactokinase Complexed with Galactose== | ||
<StructureSection load='1pie' size='340' side='right' caption='[[1pie]], [[Resolution|resolution]] 2.10Å' scene=''> | <StructureSection load='1pie' size='340' side='right'caption='[[1pie]], [[Resolution|resolution]] 2.10Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[1pie]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/"bacterium_lactis"_lister_1873 "bacterium lactis" lister 1873]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1PIE OCA]. For a <b>guided tour on the structure components</b> use [http:// | <table><tr><td colspan='2'>[[1pie]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/"bacterium_lactis"_lister_1873 "bacterium lactis" lister 1873]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1PIE OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=1PIE FirstGlance]. <br> | ||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=GLA:ALPHA+D-GALACTOSE'>GLA</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene></td></tr> | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GLA:ALPHA+D-GALACTOSE'>GLA</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene></td></tr> | ||
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">GALK ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1358 "Bacterium lactis" Lister 1873])</td></tr> | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">GALK ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1358 "Bacterium lactis" Lister 1873])</td></tr> | ||
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Galactokinase Galactokinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.1.6 2.7.1.6] </span></td></tr> | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Galactokinase Galactokinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.1.6 2.7.1.6] </span></td></tr> | ||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http:// | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=1pie FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1pie OCA], [http://pdbe.org/1pie PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1pie RCSB], [http://www.ebi.ac.uk/pdbsum/1pie PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1pie ProSAT]</span></td></tr> | ||
</table> | </table> | ||
== Function == | == Function == | ||
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</div> | </div> | ||
<div class="pdbe-citations 1pie" style="background-color:#fffaf0;"></div> | <div class="pdbe-citations 1pie" style="background-color:#fffaf0;"></div> | ||
==See Also== | |||
*[[Galactokinase|Galactokinase]] | |||
== References == | == References == | ||
<references/> | <references/> | ||
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[[Category: Bacterium lactis lister 1873]] | [[Category: Bacterium lactis lister 1873]] | ||
[[Category: Galactokinase]] | [[Category: Galactokinase]] | ||
[[Category: Large Structures]] | |||
[[Category: Holden, H M]] | [[Category: Holden, H M]] | ||
[[Category: Thoden, J B]] | [[Category: Thoden, J B]] | ||
Revision as of 10:30, 9 December 2020
Crystal Structure of Lactococcus lactis Galactokinase Complexed with GalactoseCrystal Structure of Lactococcus lactis Galactokinase Complexed with Galactose
Structural highlights
Function[GAL1_LACLA] Catalyzes the transfer of the gamma-phosphate of ATP to D-galactose to form alpha-D-galactose-1-phosphate (Gal-1-P) (Probable).[1] 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 PubMedGalactokinase plays a key role in normal galactose metabolism by catalyzing the ATP-dependent phosphorylation of alpha-D-galactose to galactose 1-phosphate. In humans, mutations in the galactokinase gene can lead to the diseased state referred to as Type II galactosemia. Here we describe the three-dimensional structure of galactokinase from Lactococcus lactis determined to 2.1-A resolution. As expected from amino acid sequence alignments, galactokinase adopts a similar topology to that observed for members of the GHMP superfamily. The N-terminal domain is characterized by a five-stranded mixed beta-sheet while the C-terminal motif is dominated by two distinct four-stranded anti-parallel beta-sheets. The structure was solved in the presence of alpha-D-galactose and inorganic phosphate. These ligands are wedged between the N- and C-terminal domains. Amino acid side chains responsible for anchoring the sugar ligand to the protein include Arg36, Glu42, Asp45, Asp183, and Tyr233. Both Arg36 and Asp183 are strictly conserved in the amino acid sequences available in the literature thus far for galactokinases. Interestingly, the carboxylate side chain of Asp183 is positioned within 3.5 A of the C-1 hydroxyl group of galactose, whereas the guanidinium group of Arg36 is situated between both the C-1 hydroxyl group and the inorganic phosphate. Most likely these residues play key roles in catalysis. The structure of galactokinase described here serves as a model for understanding the functional consequences of point mutations known to result in Type II galactosemia in humans. Molecular structure of galactokinase.,Thoden JB, Holden HM J Biol Chem. 2003 Aug 29;278(35):33305-11. Epub 2003 Jun 9. PMID:12796487[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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