View source for 4o5q


==Crystal Structure of the Alkylhydroperoxide Reductase AhpF from Escherichia coli==
<StructureSection load='4o5q' size='340' side='right'caption='[[4o5q]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4o5q]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_K-12 Escherichia coli K-12]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4O5Q OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4O5Q 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=CD:CADMIUM+ION'>CD</scene>, <scene name='pdbligand=FAD:FLAVIN-ADENINE+DINUCLEOTIDE'>FAD</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=PG4:TETRAETHYLENE+GLYCOL'>PG4</scene>, <scene name='pdbligand=PGE:TRIETHYLENE+GLYCOL'>PGE</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=TRS:2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL'>TRS</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=4o5q FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4o5q OCA], [https://pdbe.org/4o5q PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4o5q RCSB], [https://www.ebi.ac.uk/pdbsum/4o5q PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4o5q ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/AHPF_ECOLI AHPF_ECOLI] Serves to protect the cell against DNA damage by alkyl hydroperoxides. It can use either NADH or NADPH as electron donor for direct reduction of redox dyes or of alkyl hydroperoxides when combined with the AhpC protein.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Hydroperoxides are reactive oxygen species (ROS) that are toxic to all cells and must be converted into the corresponding alcohols to alleviate oxidative stress. In Escherichia coli, the enzyme primarily responsible for this reaction is alkylhydroperoxide reductase (AhpR). Here, the crystal structures of both of the subunits of EcAhpR, EcAhpF (57 kDa) and EcAhpC (21 kDa), have been solved. The EcAhpF structures (2.0 and 2.65 A resolution) reveal an open and elongated conformation, while that of EcAhpC (3.3 A resolution) forms a decameric ring. Solution X-ray scattering analysis of EcAhpF unravels the flexibility of its N-terminal domain, and its binding to EcAhpC was demonstrated by isothermal titration calorimetry. These studies suggest a novel overall mechanistic model of AhpR as a hydroperoxide scavenger, in which the dimeric, extended AhpF prefers complex formation with the AhpC ring to accelerate the catalytic activity and thus to increase the chance of rescuing the cell from ROS.

Structure, mechanism and ensemble formation of the alkylhydroperoxide reductase subunits AhpC and AhpF from Escherichia coli.,Dip PV, Kamariah N, Subramanian Manimekalai MS, Nartey W, Balakrishna AM, Eisenhaber F, Eisenhaber B, Gruber G Acta Crystallogr D Biol Crystallogr. 2014 Nov;70(Pt 11):2848-62. doi:, 10.1107/S1399004714019233. Epub 2014 Oct 16. PMID:25372677<ref>PMID:25372677</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4o5q" style="background-color:#fffaf0;"></div>

==See Also==
*[[Thioredoxin reductase 3D structures|Thioredoxin reductase 3D structures]]
== References ==
<references/>
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</StructureSection>
[[Category: Escherichia coli K-12]]
[[Category: Large Structures]]
[[Category: Balakrishna AM]]
[[Category: Dip PV]]
[[Category: Gruber G]]
[[Category: Kamariah N]]
[[Category: Manimekalai MSS]]