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| | ==Arabidopsis Hexokinase 1 (AtHXK1) structure in glucose-bound form== | | ==Arabidopsis Hexokinase 1 (AtHXK1) structure in glucose-bound form== |
| - | <StructureSection load='4qs7' size='340' side='right' caption='[[4qs7]], [[Resolution|resolution]] 2.00Å' scene=''> | + | <StructureSection load='4qs7' size='340' side='right'caption='[[4qs7]], [[Resolution|resolution]] 2.00Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[4qs7]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4QS7 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4QS7 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[4qs7]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Arabidopsis_thaliana Arabidopsis thaliana]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4QS7 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4QS7 FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=BGC:BETA-D-GLUCOSE'>BGC</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.001Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4qs8|4qs8]], [[4qs9|4qs9]]</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BGC:BETA-D-GLUCOSE'>BGC</scene></td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Hexokinase Hexokinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.1.1 2.7.1.1] </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=4qs7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4qs7 OCA], [https://pdbe.org/4qs7 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4qs7 RCSB], [https://www.ebi.ac.uk/pdbsum/4qs7 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4qs7 ProSAT]</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=4qs7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4qs7 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4qs7 RCSB], [http://www.ebi.ac.uk/pdbsum/4qs7 PDBsum]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/HXK1_ARATH HXK1_ARATH]] Fructose and glucose phosphorylating enzyme. May be involved in the phosphorylation of glucose during the export from mitochondrion to cytosol. Acts as sugar sensor which may regulate sugar-dependent gene repression or activation. Mediates the effects of sugar on plant growth and development independently of its catalytic activity or the sugar metabolism. May regulate the execution of program cell death in plant cells.<ref>PMID:12690200</ref> <ref>PMID:16920781</ref> <ref>PMID:9014361</ref> | + | [https://www.uniprot.org/uniprot/HXK1_ARATH HXK1_ARATH] Fructose and glucose phosphorylating enzyme. May be involved in the phosphorylation of glucose during the export from mitochondrion to cytosol. Acts as sugar sensor which may regulate sugar-dependent gene repression or activation. Mediates the effects of sugar on plant growth and development independently of its catalytic activity or the sugar metabolism. May regulate the execution of program cell death in plant cells.<ref>PMID:12690200</ref> <ref>PMID:16920781</ref> <ref>PMID:9014361</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> |
| | </div> | | </div> |
| | + | <div class="pdbe-citations 4qs7" style="background-color:#fffaf0;"></div> |
| | | | |
| | ==See Also== | | ==See Also== |
| - | *[[Hexokinase|Hexokinase]] | + | *[[Hexokinase 3D structures|Hexokinase 3D structures]] |
| | == References == | | == References == |
| | <references/> | | <references/> |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Hexokinase]] | + | [[Category: Arabidopsis thaliana]] |
| - | [[Category: Feng, J]] | + | [[Category: Large Structures]] |
| - | [[Category: Liu, L]] | + | [[Category: Feng J]] |
| - | [[Category: Zhao, S]] | + | [[Category: Liu L]] |
| - | [[Category: Atp-dependent]] | + | [[Category: Zhao S]] |
| - | [[Category: Sugar sensor]]
| + | |
| - | [[Category: Transferase]]
| + | |
| Structural highlights
Function
HXK1_ARATH Fructose and glucose phosphorylating enzyme. May be involved in the phosphorylation of glucose during the export from mitochondrion to cytosol. Acts as sugar sensor which may regulate sugar-dependent gene repression or activation. Mediates the effects of sugar on plant growth and development independently of its catalytic activity or the sugar metabolism. May regulate the execution of program cell death in plant cells.[1] [2] [3]
Publication Abstract from PubMed
Hexokinase 1 from Arabidopsis thaliana (AtHXK1) plays a dual role in glycolysis and sugar sensing for vital metabolic and physiological processes. The uncoupling of glucose signalling from glucose metabolism was demonstrated by the analysis of two mutants (AtHXK1(G104D) and AtHXK1(S177A)) that are catalytically inactive but still functional in signalling. In this study, substrate-binding experiments indicate that the two catalytically inactive mutants have a high affinity for glucose, and an ordered substrate-binding mechanism has been observed for wild-type AtHXK1. The structure of AtHXK1 was determined both in its inactive unliganded form and in its active glucose-bound form at resolutions of 1.8 and 2.0 A, respectively. These structures reveal a domain rearrangement of AtHXK1 upon glucose binding. The 2.1 A resolution structure of AtHXK1(S177A) in the glucose-bound form shows similar glucose-binding interactions as the wild type. A glucose-sensing network has been proposed based on these structures. Taken together, the results provide a structural explanation for the dual functions of AtHXK1.
Biochemical and structural study of Arabidopsis hexokinase 1.,Feng J, Zhao S, Chen X, Wang W, Dong W, Chen J, Shen JR, Liu L, Kuang T Acta Crystallogr D Biol Crystallogr. 2015 Feb;71(Pt 2):367-75. doi:, 10.1107/S1399004714026091. Epub 2015 Jan 23. PMID:25664748[4]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Moore B, Zhou L, Rolland F, Hall Q, Cheng WH, Liu YX, Hwang I, Jones T, Sheen J. Role of the Arabidopsis glucose sensor HXK1 in nutrient, light, and hormonal signaling. Science. 2003 Apr 11;300(5617):332-6. PMID:12690200 doi:http://dx.doi.org/10.1126/science.1080585
- ↑ Kim M, Lim JH, Ahn CS, Park K, Kim GT, Kim WT, Pai HS. Mitochondria-associated hexokinases play a role in the control of programmed cell death in Nicotiana benthamiana. Plant Cell. 2006 Sep;18(9):2341-55. Epub 2006 Aug 18. PMID:16920781 doi:http://dx.doi.org/10.1105/tpc.106.041509
- ↑ Jang JC, Leon P, Zhou L, Sheen J. Hexokinase as a sugar sensor in higher plants. Plant Cell. 1997 Jan;9(1):5-19. PMID:9014361 doi:http://dx.doi.org/10.1105/tpc.9.1.5
- ↑ Feng J, Zhao S, Chen X, Wang W, Dong W, Chen J, Shen JR, Liu L, Kuang T. Biochemical and structural study of Arabidopsis hexokinase 1. Acta Crystallogr D Biol Crystallogr. 2015 Feb;71(Pt 2):367-75. doi:, 10.1107/S1399004714026091. Epub 2015 Jan 23. PMID:25664748 doi:http://dx.doi.org/10.1107/S1399004714026091
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