1f5v

<StructureSection load='1f5v' size='340' side='right' caption='[[1f5v]], [[Resolution|resolution]] 1.70&Aring;' scene=''>

<table><tr><td colspan='2'>[[1f5v]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/"bacillus_coli"_migula_1895 "bacillus coli" migula 1895]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1F5V OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1F5V FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=FMN:FLAVIN+MONONUCLEOTIDE'>FMN</scene></td></tr>

<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/NADPH_dehydrogenase_(quinone) NADPH dehydrogenase (quinone)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.6.5.10 1.6.5.10] </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=1f5v FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1f5v OCA], [http://pdbe.org/1f5v PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1f5v RCSB], [http://www.ebi.ac.uk/pdbsum/1f5v PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1f5v ProSAT]</span></td></tr>

[[http://www.uniprot.org/uniprot/NFSA_ECOLI NFSA_ECOLI]] Reduction of nitroaromatic compounds using NADH. Reduces nitrofurazone by a ping-pong bi-bi mechanism possibly to generate a two-electron transfer product. Major component of the oxygen-insensitive nitroreductase activity in E.coli.

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== Publication Abstract from PubMed ==

The crystal structure of a major oxygen-insensitive nitroreductase (NfsA) from Escherichia coli has been solved by the molecular replacement method at 1.7-A resolution. This enzyme is a homodimeric flavoprotein with one FMN cofactor per monomer and catalyzes reduction of nitrocompounds using NADPH. The structure exhibits an alpha + beta-fold, and is comprised of a central domain and an excursion domain. The overall structure of NfsA is similar to the NADPH-dependent flavin reductase of Vibrio harveyi, despite definite difference in the spatial arrangement of residues around the putative substrate-binding site. On the basis of the crystal structure of NfsA and its alignment with the V. harveyi flavin reductase and the NADPH-dependent nitro/flavin reductase of Bacillus subtilis, residues Arg(203) and Arg(208) of the loop region between helices I and J in the vicinity of the catalytic center FMN is predicted as a determinant for NADPH binding. The R203A mutant results in a 33-fold increase in the K(m) value for NADPH indicating that the side chain of Arg(203) plays a key role in binding NADPH possibly to interact with the 2'-phosphate group.

 

== References ==

[[Category: Bacillus coli migula 1895]]

[[Category: Kobori, T]]

[[Category: Lee, W C]]

[[Category: Murphy, M E.P]]

[[Category: Saigo, K]]

[[Category: Sasaki, H]]

[[Category: Tanokura, M]]

[[Category: Zenno, S]]

[[Category: Flavoprotein]]

[[Category: Nitrocompound]]

[[Category: Nitroreductase]]

[[Category: Oxidoreductase]]

[[Category: Oxidoreduction]]