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== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[4m8u]] is a 1 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=4M8U OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4M8U FirstGlance]. <br>
<table><tr><td colspan='2'>[[4m8u]] is a 1 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=4M8U OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4M8U FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=TRS:2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL'>TRS</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]] 1.45&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=TRS:2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL'>TRS</scene></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=4m8u FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4m8u OCA], [https://pdbe.org/4m8u PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4m8u RCSB], [https://www.ebi.ac.uk/pdbsum/4m8u PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4m8u 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=4m8u FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4m8u OCA], [https://pdbe.org/4m8u PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4m8u RCSB], [https://www.ebi.ac.uk/pdbsum/4m8u PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4m8u ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[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.
[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.
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>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4m8u" style="background-color:#fffaf0;"></div>


==See Also==
==See Also==
*[[Alpha-glucosidase 3D structures|Alpha-glucosidase 3D structures]]
*[[Alpha-glucosidase 3D structures|Alpha-glucosidase 3D structures]]
== References ==
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>

Latest revision as of 12:24, 1 March 2024

The Structure of MalL mutant enzyme V200A from Bacillus subtilus

4m8u, resolution 1.45Å

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