6dqi
From Proteopedia
(Difference between revisions)
| Line 1: | Line 1: | ||
| - | '''Unreleased structure''' | ||
| - | + | ==Crystal structure of SsuE FMN reductase Y118A mutant in apo form.== | |
| + | <StructureSection load='6dqi' size='340' side='right' caption='[[6dqi]], [[Resolution|resolution]] 1.95Å' scene=''> | ||
| + | == Structural highlights == | ||
| + | <table><tr><td colspan='2'>[[6dqi]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6DQI OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6DQI FirstGlance]. <br> | ||
| + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> | ||
| + | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/FMN_reductase_(NADPH) FMN reductase (NADPH)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.5.1.38 1.5.1.38] </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=6dqi FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6dqi OCA], [http://pdbe.org/6dqi PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6dqi RCSB], [http://www.ebi.ac.uk/pdbsum/6dqi PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6dqi ProSAT]</span></td></tr> | ||
| + | </table> | ||
| + | == Function == | ||
| + | [[http://www.uniprot.org/uniprot/SSUE_ECOLI SSUE_ECOLI]] Catalyzes an NADPH-dependent reduction of FMN, but is also able to reduce FAD or riboflavin. | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | The pi-helix located at the tetramer interface of two-component FMN-dependent reductases contributes to the structural divergence from canonical FMN-bound reductases within the NADPH:FMN reductase family. The pi-helix in the SsuE FMN-dependent reductase of the alkanesulfonate monooxygenase system has been proposed to be generated by the insertion of a Tyr residue in the conserved alpha4-helix. Variants of Tyr118 were generated, and their X-ray crystal structures determined, to evaluate how these alterations affect the structural integrity of the pi-helix. The structure of the Y118A SsuE pi-helix was converted to an alpha-helix, similar to the FMN-bound members of the NADPH:FMN reductase family. Although the pi-helix was altered, the FMN binding region remained unchanged. Conversely, deletion of Tyr118 disrupted the secondary structural properties of the pi-helix, generating a random coil region in the middle of helix 4. Both the Y118A and Delta118 SsuE SsuE variants crystallize as a dimer. The MsuE FMN reductase involved in the desulfonation of methanesulfonates is structurally similar to SsuE, but the pi-helix contains a His insertional residue. Exchanging the pi-helix insertional residue of each enzyme did not result in equivalent kinetic properties. Structure-based sequence analysis further demonstrated the presence of a similar Tyr residue in an FMN-bound reductase in the NADPH:FMN reductase family that is not sufficient to generate a pi-helix. Results from the structural and functional studies of the FMN-dependent reductases suggest that the insertional residue alone is not solely responsible for generating the pi-helix, and additional structural adaptions occur to provide the altered gain of function. | ||
| - | + | Not as easy as pi: An insertional residue does not explain the pi-helix gain-of-function in two-component FMN reductases.,McFarlane JS, Hagen RA, Chilton AS, Forbes DL, Lamb AL, Ellis HR Protein Sci. 2019 Jan;28(1):123-134. doi: 10.1002/pro.3504. Epub 2018 Nov 15. PMID:30171650<ref>PMID:30171650</ref> | |
| - | + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |
| - | [[Category: | + | </div> |
| - | [[Category: Lamb, A | + | <div class="pdbe-citations 6dqi" style="background-color:#fffaf0;"></div> |
| - | [[Category: | + | == References == |
| - | [[Category: | + | <references/> |
| + | __TOC__ | ||
| + | </StructureSection> | ||
| + | [[Category: Ellis, H R]] | ||
| + | [[Category: Lamb, A L]] | ||
| + | [[Category: McFarlane, J S]] | ||
| + | [[Category: Flavoprotein]] | ||
| + | [[Category: Fmn]] | ||
| + | [[Category: Oxidoreductase]] | ||
| + | [[Category: Reductase]] | ||
Revision as of 06:35, 9 January 2019
Crystal structure of SsuE FMN reductase Y118A mutant in apo form.
| |||||||||||
