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| | ==The Structure of Wild-type MalL from Bacillus subtilis== | | ==The Structure of Wild-type MalL from Bacillus subtilis== |
| - | <StructureSection load='4m56' size='340' side='right' caption='[[4m56]], [[Resolution|resolution]] 2.30Å' scene=''> | + | <StructureSection load='4m56' size='340' side='right'caption='[[4m56]], [[Resolution|resolution]] 2.30Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[4m56]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Bacsu Bacsu]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4M56 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4M56 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[4m56]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Bacillus_subtilis_subsp._subtilis_str._168 Bacillus subtilis subsp. subtilis str. 168]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4M56 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4M56 FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=GLO:D-GLUCOSE+IN+LINEAR+FORM'>GLO</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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]] 2.3Å</td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">malL, yvdL, BSU34560 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=224308 BACSU])</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GLO:D-GLUCOSE+IN+LINEAR+FORM'>GLO</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Oligo-1,6-glucosidase Oligo-1,6-glucosidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.10 3.2.1.10] </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=4m56 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4m56 OCA], [https://pdbe.org/4m56 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4m56 RCSB], [https://www.ebi.ac.uk/pdbsum/4m56 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4m56 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=4m56 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4m56 OCA], [http://pdbe.org/4m56 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4m56 RCSB], [http://www.ebi.ac.uk/pdbsum/4m56 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4m56 ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/O16G1_BACSU O16G1_BACSU]] Hydrolyzes various disaccharides such as sucrose, maltose, and isomaltose with different efficiencies. Also hydrolyzes longer maltodextrins from maltotriose up to maltohexaose, but not maltoheptaose, palatinose, isomaltotriose, or isomaltotetraose. | + | [https://www.uniprot.org/uniprot/O16G1_BACSU O16G1_BACSU] Hydrolyzes various disaccharides such as sucrose, maltose, and isomaltose with different efficiencies. Also hydrolyzes longer maltodextrins from maltotriose up to maltohexaose, but not maltoheptaose, palatinose, isomaltotriose, or isomaltotetraose. |
| - | <div style="background-color:#fffaf0;">
| + | |
| - | == Publication Abstract from PubMed ==
| + | |
| - | The increase in enzymatic rates with temperature up to an optimum temperature (Topt) is widely attributed to classical Arrhenius behavior, with the decrease in enzymatic rates above Topt ascribed to protein denaturation and/or aggregation. This account persists despite many investigators noting that denaturation is insufficient to explain the decline in enzymatic rates above Topt. Here we show that it is the change in heat capacity associated with enzyme catalysis (DeltaCdouble daggerp) and its effect on the temperature dependence of DeltaGdouble dagger that determines the temperature dependence of enzyme activity. Through mutagenesis, we demonstrate that the Topt of an enzyme is correlated with DeltaCdouble daggerp and that changes to DeltaCdouble daggerp are sufficient to change Topt without affecting the catalytic rate. Furthermore, using X-ray crystallography and molecular dynamics simulations we reveal the molecular details underpinning these changes in DeltaCdouble daggerp. The influence of DeltaCdouble daggerp on enzymatic rates has implications for the temperature dependence of biological rates from enzymes to ecosystems.
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| - | Change in Heat Capacity for Enzyme Catalysis Determines Temperature Dependence of Enzyme Catalyzed Rates.,Hobbs JK, Jiao W, Easter AD, Parker EJ, Schipper LA, Arcus VL ACS Chem Biol. 2013 Sep 17. PMID:24015933<ref>PMID:24015933</ref>
| + | ==See Also== |
| - | | + | *[[Alpha-glucosidase 3D structures|Alpha-glucosidase 3D structures]] |
| - | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
| + | |
| - | </div>
| + | |
| - | <div class="pdbe-citations 4m56" style="background-color:#fffaf0;"></div>
| + | |
| - | == References ==
| + | |
| - | <references/>
| + | |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Bacsu]] | + | [[Category: Bacillus subtilis subsp. subtilis str. 168]] |
| - | [[Category: Oligo-1,6-glucosidase]] | + | [[Category: Large Structures]] |
| - | [[Category: Arcus, V L]] | + | [[Category: Arcus VL]] |
| - | [[Category: Easter, A D]] | + | [[Category: Easter AD]] |
| - | [[Category: Hobbs, J K]] | + | [[Category: Hobbs JK]] |
| - | [[Category: Jiao, W]] | + | [[Category: Jiao W]] |
| - | [[Category: Parker, E J]] | + | [[Category: Parker EJ]] |
| - | [[Category: Schipper, L A]] | + | [[Category: Schipper LA]] |
| - | [[Category: Glucosidase]]
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| - | [[Category: Hydrolase]]
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| - | [[Category: Tim barrel]]
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