View source for 1bxz


==CRYSTAL STRUCTURE OF A THERMOPHILIC ALCOHOL DEHYDROGENASE SUBSTRATE COMPLEX FROM THERMOANAEROBACTER BROCKII==
<StructureSection load='1bxz' size='340' side='right'caption='[[1bxz]], [[Resolution|resolution]] 2.99&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1bxz]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Thermoanaerobacter_brockii Thermoanaerobacter brockii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1BXZ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1BXZ 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]] 2.99&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=SBT:2-BUTANOL'>SBT</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=1bxz FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1bxz OCA], [https://pdbe.org/1bxz PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1bxz RCSB], [https://www.ebi.ac.uk/pdbsum/1bxz PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1bxz ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/ADH_THEBR ADH_THEBR] Alcohol dehydrogenase with a preference for medium chain secondary alcohols, such as 2-butanol and isopropanol. Has very low activity with primary alcohols, such as ethanol. Under physiological conditions, the enzyme reduces aldehydes and 2-ketones to produce secondary alcohols. Is also active with acetaldehyde and propionaldehyde.
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/bx/1bxz_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1bxz ConSurf].
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== Publication Abstract from PubMed ==
The crystal structure of a thermophilic alcohol dehydrogenase (TBAD) from Thermoanaerobacter brockii has been determined in a binary complex with sec-butanol as substrate to a resolution of 3.0 A. Van der Waals interactions of the carbon C1 atom of sec-butanol with atoms in His59, Ala85, Trp110, Asp150, and Leu294 account for the substrate preference of this enzyme for secondary over primary alcohols. A crevice from the surface to the active site provides access for substrates and products. This opening is lined with the hydrophobic residues Ile49, Leu107, Trp110, Tyr267, Leu294 as well as Cys283 and Met285 from another molecule within the tetrameric assembly. This might explain the tolerance of this enzyme toward organic solvents. The zinc ion occupies a position in the active site, which is too remote for direct interaction with the alcohol group. A mechanism is suggested whereby the introduction of NADP would trigger a displacement of the zinc ion to its catalytic site. Features important for the unusually high melting temperature of 98 degrees C are suggested by comparison to the crystal structure of a highly homologous mesophilic alcohol dehydrogenase from Clostridium beijerinckii (CBAD). The thermophilic enzyme has a more hydrophilic exterior, a more hydrophobic interior, a smaller surface area, more prolines, alanines, and fewer serines than CBAD. Furthermore, in the thermophilic enzyme the number of all types of intersubunit interactions in these tetrameric enzymes is increased: more salt bridges, hydrogen bonds, and hydrophobic interactions. All these effects combined can account for the higher melting temperature of the thermophilic enzyme.

Crystal structure of a thermophilic alcohol dehydrogenase substrate complex suggests determinants of substrate specificity and thermostability.,Li C, Heatwole J, Soelaiman S, Shoham M Proteins. 1999 Dec 1;37(4):619-27. PMID:10651277<ref>PMID:10651277</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 1bxz" style="background-color:#fffaf0;"></div>

==See Also==
*[[Alcohol dehydrogenase 3D structures|Alcohol dehydrogenase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Thermoanaerobacter brockii]]
[[Category: Heatwole J]]
[[Category: Li C]]
[[Category: Shoham M]]
[[Category: Soelaiman S]]