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4w7i

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Revision as of 01:12, 19 January 2017

Crystal structure of DEH reductase A1-R' mutant

Structural highlights

4w7i is a 4 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Related:	4tkl, 4w7h
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Publication Abstract from PubMed

The alginate-assimilating bacterium, Sphingomonas sp. strain A1, degrades the polysaccharides to monosaccharides through four alginate lyase reactions. The resultant monosaccharide, which is nonenzymatically converted to 4-deoxy-l-erythro-5-hexoseulose uronate (DEH), is further metabolized to 2-keto-3-deoxy-d-gluconate by NADPH-dependent reductase A1-R in the short-chain dehydrogenase/reductase (SDR) family. A1-R-deficient cells produced another DEH reductase, designated A1-R', with a preference for NADH. Here, we show the identification of a novel NADH-dependent DEH reductase A1-R' in strain A1, structural determination of A1-R' by x-ray crystallography, and structure-based conversion of a coenzyme requirement in SDR enzymes, A1-R and A1-R'. A1-R' was purified from strain A1 cells and enzymatically characterized. Except for the coenzyme requirement, there was no significant difference in enzyme characteristics between A1-R and A1-R'. Crystal structures of A1-R' and A1-R'.NAD(+) complex were determined at 1.8 and 2.7 A resolutions, respectively. Because of a 64% sequence identity, overall structures of A1-R' and A1-R were similar, although a difference in the coenzyme-binding site (particularly the nucleoside ribose 2' region) was observed. Distinct from A1-R, A1-R' included a negatively charged, shallower binding site. These differences were caused by amino acid residues on the two loops around the site. The A1-R' mutant with the two A1-R-typed loops maintained potent enzyme activity with specificity for NADPH rather than NADH, demonstrating that the two loops determine the coenzyme requirement, and loop exchange is a promising method for conversion of coenzyme requirement in the SDR family.

Structure-based Conversion of the Coenzyme Requirement of a Short-chain Dehydrogenase/Reductase Involved in Bacterial Alginate Metabolism.,Takase R, Mikami B, Kawai S, Murata K, Hashimoto W J Biol Chem. 2014 Nov 28;289(48):33198-214. doi: 10.1074/jbc.M114.585661. Epub, 2014 Oct 6. PMID:25288804^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Takase R, Mikami B, Kawai S, Murata K, Hashimoto W. Structure-based Conversion of the Coenzyme Requirement of a Short-chain Dehydrogenase/Reductase Involved in Bacterial Alginate Metabolism. J Biol Chem. 2014 Nov 28;289(48):33198-214. doi: 10.1074/jbc.M114.585661. Epub, 2014 Oct 6. PMID:25288804 doi:http://dx.doi.org/10.1074/jbc.M114.585661

1 Structural highlights
2 Publication Abstract from PubMed
3 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/4w7i"

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 ==Crystal structure of DEH reductase A1-R' mutant==
 <StructureSection load='4w7i' size='340' side='right' caption='[[4w7i]], [[Resolution|resolution]] 1.98&Aring;' scene=''>
@@ Line 4: / Line 5: @@
 <table><tr><td colspan='2'>[[4w7i]] is a 4 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4W7I OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4W7I FirstGlance]. <br>
 </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4tkl|4tkl]], [[4w7h|4w7h]]</td></tr>
-<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4w7i FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4w7i OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4w7i RCSB], [http://www.ebi.ac.uk/pdbsum/4w7i PDBsum]</span></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4w7i FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4w7i OCA], [http://pdbe.org/4w7i PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4w7i RCSB], [http://www.ebi.ac.uk/pdbsum/4w7i PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4w7i ProSAT]</span></td></tr>
 </table>
 <div style="background-color:#fffaf0;">
@@ Line 14: / Line 15: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 4w7i" style="background-color:#fffaf0;"></div>
 == References ==
 <references/>

4w7i

From Proteopedia

Revision as of 01:12, 19 January 2017

Crystal structure of DEH reductase A1-R' mutant

Structural highlights

Publication Abstract from PubMed

References

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