View source for 4itu


==Crystal structure of S-2-HYDROXYPROPYL COENZYME M DEHYDROGENASE (S-HPCDH) bound to S-HPC AND NADH==
<StructureSection load='4itu' size='340' side='right'caption='[[4itu]], [[Resolution|resolution]] 1.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4itu]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Xanthobacter_autotrophicus_Py2 Xanthobacter autotrophicus Py2]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4ITU OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4ITU 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]] 1.6&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=1HS:2-{[(2S)-2-HYDROXYPROPYL]SULFANYL}ETHANESULFONIC+ACID'>1HS</scene>, <scene name='pdbligand=NAI:1,4-DIHYDRONICOTINAMIDE+ADENINE+DINUCLEOTIDE'>NAI</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=4itu FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4itu OCA], [https://pdbe.org/4itu PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4itu RCSB], [https://www.ebi.ac.uk/pdbsum/4itu PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4itu ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/HCDS3_XANP2 HCDS3_XANP2] Involved in aliphatic epoxide carboxylation (PubMed:20302306). Catalyzes the reversible oxidation of (2S)-2-hydroxypropyl-coenzyme M (S-HPC) to 2-oxopropyl-coenzyme M (2-KPC) (PubMed:20302306). The enzyme is highly specific for the S enantiomers (PubMed:20302306). In vitro can also use the aliphatic ketone 2-butanone and the aliphatic alcohol 2-propanol, and shows an inherent stereoselectivity for 2-butanone reduction (PubMed:20302306).<ref>PMID:20302306</ref> 
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== Publication Abstract from PubMed ==
(R)- and (S)-hydroxypropyl-coenzyme M dehydrogenases (R- and S-HPCDH) are stereospecific enzymes that are central to the metabolism of propylene and epoxide in Xanthobacter autotrophicus. The bacterium produces R- and S-HPCDH simultaneously to facilitate transformation of R- and S-enantiomers of epoxypropane to a common achiral product 2-ketopropyl-CoM (2-KPC). Both R- and S-HPCDH are highly specific for their respective substrates as each enzyme displays less than 0.5% activity with the opposite substrate isomer. In order to elucidate the structural basis for stereospecificity displayed by R- and S-HPCDH we have determined substrate bound crystal structures of S-HPCDH to 1.6A resolution. Comparisons to the previously reported product-bound structure of R-HPCDH reveal that although the placement of catalytic residues within the active site of each enzyme is nearly identical, structural differences in the surrounding area provide each enzyme with a distinct substrate binding pocket. These structures demonstrate how chiral discrimination by R- and S-HPCDH results from alternative binding of the distal end of substrates within each substrate binding pocket.

Crystal structures of S-HPCDH reveal determinants of stereospecificity for R- and S-hydroxypropyl-coenzyme M dehydrogenases.,Bakelar JW, Sliwa DA, Johnson SJ Arch Biochem Biophys. 2013 Mar 6. pii: S0003-9861(13)00068-4. doi:, 10.1016/j.abb.2013.02.017. PMID:23474457<ref>PMID:23474457</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 4itu" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Large Structures]]
[[Category: Xanthobacter autotrophicus Py2]]
[[Category: Bakelar JW]]
[[Category: Johnson SJ]]