View source for 5m69


==Thermolysin in complex with inhibitor and xenon==
<StructureSection load='5m69' size='340' side='right'caption='[[5m69]], [[Resolution|resolution]] 1.44&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5m69]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Bacillus_thermoproteolyticus Bacillus thermoproteolyticus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5M69 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5M69 FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.44&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=7GR:(2~{S})-4-methyl-2-[2-[[oxidanyl(phenylmethoxycarbonylaminomethyl)phosphoryl]amino]ethanoylamino]pentanoic+acid'>7GR</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=DMS:DIMETHYL+SULFOXIDE'>DMS</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=XE:XENON'>XE</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</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=5m69 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5m69 OCA], [https://pdbe.org/5m69 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5m69 RCSB], [https://www.ebi.ac.uk/pdbsum/5m69 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5m69 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/THER_BACTH THER_BACTH] Extracellular zinc metalloprotease.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
We investigated the hydration state of the deep, well-accessible hydrophobic S1' specificity pocket of the metalloprotease thermolysin with purposefully designed ligands using high-resolution crystallography and isothermal titration calorimetry. The S1' pocket is known to recognize selectively a very stringent set of aliphatic side chains such as valine, leucine, and isoleucine of putative substrates. We engineered a weak-binding ligand covering the active site of the protease without addressing the S1' pocket, thus transforming it into an enclosed cavity. Its sustained accessibility could be proved by accommodating noble gas atoms into the pocket in the crystalline state. The topology and electron content of the enclosed pocket with a volume of 141 A3 were analyzed using an experimental MAD-phased electron density map that was calibrated to an absolute electron number scale, enabling access to the total electron content within the cavity. Our analysis indicates that the S1' pocket is virtually vacated, thus free of any water molecules. The thermodynamic signature of the reduction of the void within the pocket by growing aliphatic P1' substituents (H, Me, iPr, iBu) reveals a dramatic, enthalpy-dominated gain in free energy of binding resulting in a factor of 41000 in Kd for the H-to-iBu transformation. Substituents placing polar decoy groups into the pocket to capture putatively present water molecules could not collect any evidence for a bound solvent molecule.

How Nothing Boosts Affinity: Hydrophobic Ligand Binding to the Virtually Vacated S1' Pocket of Thermolysin.,Krimmer SG, Cramer J, Schiebel J, Heine A, Klebe G J Am Chem Soc. 2017 Aug 2;139(30):10419-10431. doi: 10.1021/jacs.7b05028. Epub, 2017 Jul 24. PMID:28696673<ref>PMID:28696673</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5m69" style="background-color:#fffaf0;"></div>

==See Also==
*[[Thermolysin 3D structures|Thermolysin 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Bacillus thermoproteolyticus]]
[[Category: Large Structures]]
[[Category: Cramer J]]
[[Category: Heine A]]
[[Category: Klebe G]]
[[Category: Krimmer SG]]