View source for 4is3


==Crystal structure of a 3alpha-hydroxysteroid dehydrogenase (BaiA2) associated with secondary bile acid synthesis from Clostridium scindens VPI12708 in complex with a putative NAD(+)-OH- adduct at 2.0 A resolution==
<StructureSection load='4is3' size='340' side='right'caption='[[4is3]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4is3]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Clostridium_scindens Clostridium scindens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4IS3 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4IS3 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&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene>, <scene name='pdbligand=NAD:NICOTINAMIDE-ADENINE-DINUCLEOTIDE'>NAD</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=4is3 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4is3 OCA], [https://pdbe.org/4is3 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4is3 RCSB], [https://www.ebi.ac.uk/pdbsum/4is3 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4is3 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/BAIA2_CLOSV BAIA2_CLOSV] Involved in the multi-step bile acid 7alpha-dehydroxylation pathway that transforms primary bile acids to secondary bile acids in the human gut (PubMed:16299351, PubMed:23836456). Catalyzes the oxidation of C3-hydroxyl group of CoA conjugated bile acids generating a C3-oxo bile acid intermediate. Can use choloyl-CoA, chenodeoxycholoyl-CoA, deoxycholoyl-CoA, and lithocholoyl-CoA as substrates with similar efficiency. Highly prefers NAD over NADP as cosubstrate. Also catalyzes the reverse reactions; in vitro, the preferred direction of reaction depends on the pH. Has very little activity with unconjugated (non-CoA) bile acid substrates (PubMed:23836456).<ref>PMID:23836456</ref> <ref>PMID:16299351</ref> 

==See Also==
*[[Hydroxysteroid dehydrogenase 3D structures|Hydroxysteroid dehydrogenase 3D structures]]
== References ==
<references/>
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</StructureSection>
[[Category: Large Structures]]