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| | <SX load='6si8' size='340' side='right' viewer='molstar' caption='[[6si8]], [[Resolution|resolution]] 3.40Å' scene=''> | | <SX load='6si8' size='340' side='right' viewer='molstar' caption='[[6si8]], [[Resolution|resolution]] 3.40Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[6si8]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/"bacillus_coli"_migula_1895 "bacillus coli" migula 1895]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6SI8 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6SI8 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[6si8]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6SI8 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6SI8 FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=AMP:ADENOSINE+MONOPHOSPHATE'>AMP</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 3.4Å</td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">glgC, b3430, JW3393 ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 "Bacillus coli" Migula 1895])</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=AMP:ADENOSINE+MONOPHOSPHATE'>AMP</scene></td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Glucose-1-phosphate_adenylyltransferase Glucose-1-phosphate adenylyltransferase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.7.27 2.7.7.27] </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=6si8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6si8 OCA], [https://pdbe.org/6si8 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6si8 RCSB], [https://www.ebi.ac.uk/pdbsum/6si8 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6si8 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=6si8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6si8 OCA], [https://pdbe.org/6si8 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6si8 RCSB], [https://www.ebi.ac.uk/pdbsum/6si8 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6si8 ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[https://www.uniprot.org/uniprot/GLGC_ECOLI GLGC_ECOLI]] Catalyzes the synthesis of ADP-glucose, a sugar donor used in elongation reactions on alpha-glucans.
| + | [https://www.uniprot.org/uniprot/GLGC_ECOLI GLGC_ECOLI] Catalyzes the synthesis of ADP-glucose, a sugar donor used in elongation reactions on alpha-glucans. |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | __TOC__ | | __TOC__ |
| | </SX> | | </SX> |
| - | [[Category: Bacillus coli migula 1895]] | + | [[Category: Escherichia coli]] |
| - | [[Category: Glucose-1-phosphate adenylyltransferase]]
| + | |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Albesa-Jove, D]] | + | [[Category: Albesa-Jove D]] |
| - | [[Category: Angelo, C D]] | + | [[Category: Cifuente JO]] |
| - | [[Category: Cifuente, J O]] | + | [[Category: Comino N]] |
| - | [[Category: Comino, N]] | + | [[Category: D'Angelo C]] |
| - | [[Category: Gil-Carton, D]] | + | [[Category: Gil-Carton D]] |
| - | [[Category: Guerin, M E]] | + | [[Category: Guerin ME]] |
| - | [[Category: Marina, A]] | + | [[Category: Marina A]] |
| - | [[Category: Adp-glucose pyrophosphorilase complex with amp inhibitor]]
| + | |
| - | [[Category: Transferase]]
| + | |
| Structural highlights
Function
GLGC_ECOLI Catalyzes the synthesis of ADP-glucose, a sugar donor used in elongation reactions on alpha-glucans.
Publication Abstract from PubMed
Glycogen and starch are the major carbon and energy reserve polysaccharides in nature, providing living organisms with a survival advantage. The evolution of the enzymatic machinery responsible for the biosynthesis and degradation of such polysaccharides, led the development of mechanisms to control the assembly and disassembly rate, to store and recover glucose according to cell energy demands. The tetrameric enzyme ADP-glucose pyrophosphorylase (AGPase) catalyzes and regulates the initial step in the biosynthesis of both alpha-polyglucans. AGPase displays cooperativity and allosteric regulation by sensing metabolites from the cell energy flux. The understanding of the allosteric signal transduction mechanisms in AGPase arises as a long-standing challenge. In this work, we disclose the cryoEM structures of the paradigmatic homotetrameric AGPase from Escherichia coli (EcAGPase), in complex with either positive or negative physiological allosteric regulators, fructose-1,6-bisphosphate (FBP) and AMP respectively, both at 3.0 A resolution. Strikingly, the structures reveal that FBP binds deeply into the allosteric cleft and overlaps the AMP site. As a consequence, FBP promotes a concerted conformational switch of a regulatory loop, RL2, from a "locked" to a "free" state, modulating ATP binding and activating the enzyme. This notion is strongly supported by our complementary biophysical and bioinformatics evidence, and a careful analysis of vast enzyme kinetics data on single-point mutants of EcAGPase. The cryoEM structures uncover the residue interaction networks (RIN) between the allosteric and the catalytic components of the enzyme, providing unique details on how the signaling information is transmitted across the tetramer, from which cooperativity emerges. Altogether, the conformational states visualized by cryoEM reveal the regulatory mechanism of EcAGPase, laying the foundations to understand the allosteric control of bacterial glycogen biosynthesis at the molecular level of detail.
The allosteric control mechanism of bacterial glycogen biosynthesis disclosed by cryoEM.,Cifuente JO, Comino N, D'Angelo C, Marina A, Gil-Carton D, Albesa-Jove D, Guerin ME Curr Res Struct Biol. 2020 May 1;2:89-103. doi: 10.1016/j.crstbi.2020.04.005., eCollection 2020. PMID:34235472[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Cifuente JO, Comino N, D'Angelo C, Marina A, Gil-Carton D, Albesa-Jove D, Guerin ME. The allosteric control mechanism of bacterial glycogen biosynthesis disclosed by cryoEM. Curr Res Struct Biol. 2020 May 1;2:89-103. doi: 10.1016/j.crstbi.2020.04.005., eCollection 2020. PMID:34235472 doi:http://dx.doi.org/10.1016/j.crstbi.2020.04.005
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