View source for 5hr2


==Crystal structure of thioredoxin L94A mutant==
<StructureSection load='5hr2' size='340' side='right'caption='[[5hr2]], [[Resolution|resolution]] 1.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5hr2]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5HR2 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5HR2 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]] 1.2&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CU:COPPER+(II)+ION'>CU</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=5hr2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5hr2 OCA], [https://pdbe.org/5hr2 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5hr2 RCSB], [https://www.ebi.ac.uk/pdbsum/5hr2 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5hr2 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/THIO_ECOLI THIO_ECOLI] Participates in various redox reactions through the reversible oxidation of its active center dithiol to a disulfide and catalyzes dithiol-disulfide exchange reactions.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Thioredoxin is a ubiquitous small protein that catalyzes redox reactions of protein thiols. Additionally, thioredoxin from E. coli (EcTRX) is a widely-used model for structure-function studies. In a previous paper, we characterized several single-point mutants of the C-terminal helix (CTH) that alter global stability of EcTRX. However, spectroscopic signatures and enzymatic activity for some of these mutants were found essentially unaffected. A comprehensive structural characterization at the atomic level of these near-invariant mutants can provide detailed information about structural variability of EcTRX. We address this point through the determination of the crystal structures of four point-mutants, whose mutations occurs within or near the CTH, namely L94A, E101G, N106A and L107A. These structures are mostly unaffected compared with the wild-type variant. Notably, the E101G mutant presents a large region with two alternative traces for the backbone of the same chain. It represents a significant shift in backbone positions. Enzymatic activity measurements and conformational dynamics studies monitored by NMR and molecular dynamic simulations show that E101G mutation results in a small effect in the structural features of the protein. We hypothesize that these alternative conformations represent samples of the native-state ensemble of EcTRX, specifically the magnitude and location of conformational heterogeneity.

Structural variability of E. coli thioredoxin captured in the crystal structures of single-point mutants.,Noguera ME, Vazquez DS, Ferrer-Sueta G, Agudelo WA, Howard E, Rasia RM, Manta B, Cousido-Siah A, Mitschler A, Podjarny A, Santos J Sci Rep. 2017 Feb 9;7:42343. doi: 10.1038/srep42343. PMID:28181556<ref>PMID:28181556</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5hr2" style="background-color:#fffaf0;"></div>

==See Also==
*[[Thioredoxin 3D structures|Thioredoxin 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia coli]]
[[Category: Large Structures]]
[[Category: Cousido-Siah A]]
[[Category: Howard EI]]
[[Category: Mitschler A]]
[[Category: Noguera ME]]
[[Category: Podjarny A]]
[[Category: Santos J]]
[[Category: Vazquez DS]]