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| | <StructureSection load='2a2c' size='340' side='right'caption='[[2a2c]], [[Resolution|resolution]] 1.65Å' scene=''> | | <StructureSection load='2a2c' size='340' side='right'caption='[[2a2c]], [[Resolution|resolution]] 1.65Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[2a2c]] is a 1 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=2A2C OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2A2C FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[2a2c]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2A2C OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2A2C FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ADP:ADENOSINE-5-DIPHOSPHATE'>ADP</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NG1:N-ACETYL-ALPHA-D-GALACTOSAMINE+1-PHOSPHATE'>NG1</scene></td></tr> | + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ADP:ADENOSINE-5-DIPHOSPHATE'>ADP</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NG1:N-ACETYL-ALPHA-D-GALACTOSAMINE+1-PHOSPHATE'>NG1</scene></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">GALK2, GK2 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr> | + | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">GALK2, GK2 ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</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=2a2c FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2a2c OCA], [http://pdbe.org/2a2c PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2a2c RCSB], [http://www.ebi.ac.uk/pdbsum/2a2c PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2a2c ProSAT]</span></td></tr> | + | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2a2c FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2a2c OCA], [https://pdbe.org/2a2c PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2a2c RCSB], [https://www.ebi.ac.uk/pdbsum/2a2c PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2a2c ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/GALK2_HUMAN GALK2_HUMAN]] Acts on GalNAc. Also acts as a galactokinase when galactose is present at high concentrations. May be involved in a salvage pathway for the reutilization of free GalNAc derived from the degradation of complex carbohydrates.<ref>PMID:8798585</ref> <ref>PMID:16006554</ref> | + | [[https://www.uniprot.org/uniprot/GALK2_HUMAN GALK2_HUMAN]] Acts on GalNAc. Also acts as a galactokinase when galactose is present at high concentrations. May be involved in a salvage pathway for the reutilization of free GalNAc derived from the degradation of complex carbohydrates.<ref>PMID:8798585</ref> <ref>PMID:16006554</ref> |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
| Structural highlights
2a2c is a 1 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
| | Ligands: | , , , , |
| Gene: | GALK2, GK2 (HUMAN) |
| Resources: | FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT |
Function
[GALK2_HUMAN] Acts on GalNAc. Also acts as a galactokinase when galactose is present at high concentrations. May be involved in a salvage pathway for the reutilization of free GalNAc derived from the degradation of complex carbohydrates.[1] [2]
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
Galactokinase plays a key role in normal galactose metabolism by catalyzing the conversion of alpha-d-galactose to galactose 1-phosphate. Within recent years, the three-dimensional structures of human galactokinase and two bacterial forms of the enzyme have been determined. Originally, the gene encoding galactokinase in humans was mapped to chromosome 17. An additional gene, encoding a protein with sequence similarity to galactokinase, was subsequently mapped to chromosome 15. Recent reports have shown that this second gene (GALK2) encodes an enzyme with greater activity against GalNAc than galactose. This enzyme, GalNAc kinase, has been implicated in a salvage pathway for the reutilization of free GalNAc derived from the degradation of complex carbohydrates. Here we report the first structural analysis of a GalNAc kinase. The structure of the human enzyme was solved in the presence of MnAMPPNP and GalNAc or MgATP and GalNAc (which resulted in bound products in the active site). The enzyme displays a distinctly bilobal appearance with its active site wedged between the two domains. The N-terminal region is dominated by a seven-stranded mixed beta-sheet, whereas the C-terminal motif contains two layers of anti-parallel beta-sheet. The overall topology displayed by GalNAc kinase places it into the GHMP superfamily of enzymes, which generally function as small molecule kinases. From this investigation, the geometry of the GalNAc kinase active site before and after catalysis has been revealed, and the determinants of substrate specificity have been defined on a molecular level.
The molecular architecture of human N-acetylgalactosamine kinase.,Thoden JB, Holden HM J Biol Chem. 2005 Sep 23;280(38):32784-91. Epub 2005 Jul 8. PMID:16006554[3]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Pastuszak I, O'Donnell J, Elbein AD. Identification of the GalNAc kinase amino acid sequence. J Biol Chem. 1996 Sep 27;271(39):23653-6. PMID:8798585
- ↑ Thoden JB, Holden HM. The molecular architecture of human N-acetylgalactosamine kinase. J Biol Chem. 2005 Sep 23;280(38):32784-91. Epub 2005 Jul 8. PMID:16006554 doi:10.1074/jbc.M505730200
- ↑ Thoden JB, Holden HM. The molecular architecture of human N-acetylgalactosamine kinase. J Biol Chem. 2005 Sep 23;280(38):32784-91. Epub 2005 Jul 8. PMID:16006554 doi:10.1074/jbc.M505730200
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