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| | <StructureSection load='4k6r' size='340' side='right'caption='[[4k6r]], [[Resolution|resolution]] 1.98Å' scene=''> | | <StructureSection load='4k6r' size='340' side='right'caption='[[4k6r]], [[Resolution|resolution]] 1.98Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[4k6r]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/"bacillus_tuberculosis"_(zopf_1883)_klein_1884 "bacillus tuberculosis" (zopf 1883) klein 1884]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4K6R OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4K6R FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[4k6r]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Mycobacterium_tuberculosis Mycobacterium tuberculosis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4K6R OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4K6R FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ATP:ADENOSINE-5-TRIPHOSPHATE'>ATP</scene>, <scene name='pdbligand=CO:COBALT+(II)+ION'>CO</scene>, <scene name='pdbligand=GN1:2-(ACETYLAMINO)-2-DEOXY-1-O-PHOSPHONO-ALPHA-D-GLUCOPYRANOSE'>GN1</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr> | + | </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=CO:COBALT+(II)+ION'>CO</scene>, <scene name='pdbligand=GN1:2-(ACETYLAMINO)-2-DEOXY-1-O-PHOSPHONO-ALPHA-D-GLUCOPYRANOSE'>GN1</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">glmU, MT1046, Rv1018c ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1773 "Bacillus tuberculosis" (Zopf 1883) Klein 1884])</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=4k6r FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4k6r OCA], [https://pdbe.org/4k6r PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4k6r RCSB], [https://www.ebi.ac.uk/pdbsum/4k6r PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4k6r 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=4k6r FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4k6r OCA], [http://pdbe.org/4k6r PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4k6r RCSB], [http://www.ebi.ac.uk/pdbsum/4k6r PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4k6r ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/GLMU_MYCTU GLMU_MYCTU]] Catalyzes the last two sequential reactions in the de novo biosynthetic pathway for UDP-N-acetylglucosamine (UDP-GlcNAc). The C-terminal domain catalyzes the transfer of acetyl group from acetyl coenzyme A to glucosamine-1-phosphate (GlcN-1-P) to produce N-acetylglucosamine-1-phosphate (GlcNAc-1-P), which is converted into UDP-GlcNAc by the transfer of uridine 5-monophosphate (from uridine 5-triphosphate), a reaction catalyzed by the N-terminal domain.<ref>PMID:19237750</ref> <ref>PMID:19121323</ref> | + | [https://www.uniprot.org/uniprot/GLMU_MYCTU GLMU_MYCTU] Catalyzes the last two sequential reactions in the de novo biosynthetic pathway for UDP-N-acetylglucosamine (UDP-GlcNAc). The C-terminal domain catalyzes the transfer of acetyl group from acetyl coenzyme A to glucosamine-1-phosphate (GlcN-1-P) to produce N-acetylglucosamine-1-phosphate (GlcNAc-1-P), which is converted into UDP-GlcNAc by the transfer of uridine 5-monophosphate (from uridine 5-triphosphate), a reaction catalyzed by the N-terminal domain.<ref>PMID:19237750</ref> <ref>PMID:19121323</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | </div> | | </div> |
| | <div class="pdbe-citations 4k6r" style="background-color:#fffaf0;"></div> | | <div class="pdbe-citations 4k6r" style="background-color:#fffaf0;"></div> |
| | + | |
| | + | ==See Also== |
| | + | *[[N-acetylglucosamine-1-phosphate uridyltransferase|N-acetylglucosamine-1-phosphate uridyltransferase]] |
| | == References == | | == References == |
| | <references/> | | <references/> |
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| | </StructureSection> | | </StructureSection> |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Prakash, B]] | + | [[Category: Mycobacterium tuberculosis]] |
| - | [[Category: Vithani, N]] | + | [[Category: Prakash B]] |
| - | [[Category: Rossmann fold]] | + | [[Category: Vithani N]] |
| - | [[Category: Transferase]]
| + | |
| Structural highlights
Function
GLMU_MYCTU Catalyzes the last two sequential reactions in the de novo biosynthetic pathway for UDP-N-acetylglucosamine (UDP-GlcNAc). The C-terminal domain catalyzes the transfer of acetyl group from acetyl coenzyme A to glucosamine-1-phosphate (GlcN-1-P) to produce N-acetylglucosamine-1-phosphate (GlcNAc-1-P), which is converted into UDP-GlcNAc by the transfer of uridine 5-monophosphate (from uridine 5-triphosphate), a reaction catalyzed by the N-terminal domain.[1] [2]
Publication Abstract from PubMed
N-Acetylglucosamine-1-phosphate uridyltransferase (GlmU), a bifunctional enzyme exclusive to prokaryotes, belongs to the family of sugar nucleotidyltransferases (SNTs). The enzyme binds GlcNAc-1-P and UTP, and catalyzes a uridyltransfer reaction to synthesize UDP-GlcNAc, an important precursor for cell-wall biosynthesis. As many SNTs are known to utilize a broad range of substrates, substrate specificity in GlmU was probed using biochemical and structural studies. The enzymatic assays reported here demonstrate that GlmU is specific for its natural substrates UTP and GlcNAc-1-P. The crystal structure of GlmU bound to ATP and GlcNAc-1-P provides molecular details for the inability of the enzyme to utilize ATP for the nucleotidyltransfer reaction. ATP binding results in an inactive pre-catalytic enzyme-substrate complex, where it adopts an unusual conformation such that the reaction cannot be catalyzed; here, ATP is shown to be bound together with three Mg2+ ions. Overall, this structure represents the binding of an inhibitory molecule at the active site and can potentially be used to develop new inhibitors of the enzyme. Further, similar to DNA/RNA polymerases, GlmU was recently recognized to utilize two metal ions, MgA2+ and MgB2+, to catalyze the uridyltransfer reaction. Interestingly, displacement of MgB2+ from its usual catalytically competent position, as noted in the crystal structure of RNA polymerase in an inactive state, was considered to be a key factor inhibiting the reaction. Surprisingly, in the current structure of GlmU MgB2+ is similarly displaced; this raises the possibility that an analogous inhibitory mechanism may be operative in GlmU.
GlmU (N-acetylglucosamine-1-phosphate uridyltransferase) bound to three magnesium ions and ATP at the active site.,Vithani N, Bais V, Prakash B Acta Crystallogr F Struct Biol Commun. 2014 Jun;70(Pt 6):703-8. doi:, 10.1107/S2053230X14008279. Epub 2014 May 10. PMID:24915076[3]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Zhang Z, Bulloch EM, Bunker RD, Baker EN, Squire CJ. Structure and function of GlmU from Mycobacterium tuberculosis. Acta Crystallogr D Biol Crystallogr. 2009 Mar;65(Pt 3):275-83. Epub 2009, Feb 20. PMID:19237750 doi:10.1107/S0907444909001036
- ↑ Parikh A, Verma SK, Khan S, Prakash B, Nandicoori VK. PknB-mediated phosphorylation of a novel substrate, N-acetylglucosamine-1-phosphate uridyltransferase, modulates its acetyltransferase activity. J Mol Biol. 2009 Feb 20;386(2):451-64. Epub 2008 Dec 24. PMID:19121323 doi:10.1016/j.jmb.2008.12.031
- ↑ Vithani N, Bais V, Prakash B. GlmU (N-acetylglucosamine-1-phosphate uridyltransferase) bound to three magnesium ions and ATP at the active site. Acta Crystallogr F Struct Biol Commun. 2014 Jun;70(Pt 6):703-8. doi:, 10.1107/S2053230X14008279. Epub 2014 May 10. PMID:24915076 doi:http://dx.doi.org/10.1107/S2053230X14008279
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