2voc

From Proteopedia

(Difference between revisions)

Revision as of 06:58, 28 February 2018

THIOREDOXIN A ACTIVE SITE MUTANTS FORM MIXED DISULFIDE DIMERS THAT RESEMBLE ENZYME-SUBSTRATE REACTION INTERMEDIATE

Structural highlights

2voc is a 2 chain structure with sequence from "vibrio_subtilis"_ehrenberg_1835 "vibrio subtilis" ehrenberg 1835. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[THIO_BACSU] Participates in various redox reactions through the reversible oxidation of its active center dithiol to a disulfide and catalyzes dithiol-disulfide exchange reactions.

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

Thioredoxin functions in nearly all organisms as the major thiol-disulfide oxidoreductase within the cytosol. Its prime purpose is to maintain cysteine-containing proteins in the reduced state by converting intramolecular disulfide bonds into dithiols in a disulfide exchange reaction. Thioredoxin has been reported to contribute to a wide variety of physiological functions by interacting with specific sets of substrates in different cell types. To investigate the function of the essential thioredoxin A (TrxA) in the low-GC Gram-positive bacterium Bacillus subtilis, we purified wild-type TrxA and three mutant TrxA proteins that lack either one or both of the two cysteine residues in the CxxC active site. The pure proteins were used for substrate-binding studies known as "mixed disulfide fishing" in which covalent disulfide-bonded reaction intermediates can be visualized. An unprecedented finding is that both active-site cysteine residues can form mixed disulfides with substrate proteins when the other active-site cysteine is absent, but only the N-terminal active-site cysteine forms stable interactions. A second novelty is that both single-cysteine mutant TrxA proteins form stable homodimers due to thiol oxidation of the remaining active-site cysteine residue. To investigate whether these dimers resemble mixed enzyme-substrate disulfides, the structure of the most abundant dimer, C32S, was characterized by X-ray crystallography. This yielded a high-resolution (1.5A) X-ray crystallographic structure of a thioredoxin homodimer from a low-GC Gram-positive bacterium. The C32S TrxA dimer can be regarded as a mixed disulfide reaction intermediate of thioredoxin, which reveals the diversity of thioredoxin/substrate-binding modes.

Thioredoxin A active-site mutants form mixed disulfide dimers that resemble enzyme-substrate reaction intermediates.,Kouwen TR, Andrell J, Schrijver R, Dubois JY, Maher MJ, Iwata S, Carpenter EP, van Dijl JM J Mol Biol. 2008 Jun 6;379(3):520-34. Epub 2008 Apr 10. PMID:18455736^[1]

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

References

↑ Kouwen TR, Andrell J, Schrijver R, Dubois JY, Maher MJ, Iwata S, Carpenter EP, van Dijl JM. Thioredoxin A active-site mutants form mixed disulfide dimers that resemble enzyme-substrate reaction intermediates. J Mol Biol. 2008 Jun 6;379(3):520-34. Epub 2008 Apr 10. PMID:18455736 doi:10.1016/j.jmb.2008.03.077

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/2voc"

@@ Line 1: / Line 1: @@
 ==THIOREDOXIN A ACTIVE SITE MUTANTS FORM MIXED DISULFIDE DIMERS THAT RESEMBLE ENZYME-SUBSTRATE REACTION INTERMEDIATE==
 <StructureSection load='2voc' size='340' side='right' caption='[[2voc]], [[Resolution|resolution]] 1.50&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[2voc]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/"bacillus_globigii"_migula_1900 "bacillus globigii" migula 1900]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2VOC OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2VOC FirstGlance]. <br>
+<table><tr><td colspan='2'>[[2voc]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/"vibrio_subtilis"_ehrenberg_1835 "vibrio subtilis" ehrenberg 1835]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2VOC OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2VOC FirstGlance]. <br>
 </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</scene></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=2voc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2voc OCA], [http://pdbe.org/2voc PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2voc RCSB], [http://www.ebi.ac.uk/pdbsum/2voc 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=2voc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2voc OCA], [http://pdbe.org/2voc PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2voc RCSB], [http://www.ebi.ac.uk/pdbsum/2voc PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2voc ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 12: / Line 13: @@
 Check<jmol>
   <jmolCheckbox>
-    <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/vo/2voc_consurf.spt"</scriptWhenChecked>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/vo/2voc_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>
@@ Line 27: / Line 28: @@
 </div>
 <div class="pdbe-citations 2voc" style="background-color:#fffaf0;"></div>
-==See Also==
-*[[Thioredoxin|Thioredoxin]]
 == References ==
 <references/>
 __TOC__
 </StructureSection>
-[[Category: Bacillus globigii migula 1900]]
+[[Category: Vibrio subtilis ehrenberg 1835]]
 [[Category: Andrell, J]]
 [[Category: Carpenter, E P]]
-[[Category: Dijl, J M.Van]]
+[[Category: Dijl, J M.van]]
 [[Category: Dubois, J Y.F]]
 [[Category: Iwata, S]]

2voc

From Proteopedia

Revision as of 06:58, 28 February 2018

THIOREDOXIN A ACTIVE SITE MUTANTS FORM MIXED DISULFIDE DIMERS THAT RESEMBLE ENZYME-SUBSTRATE REACTION INTERMEDIATE

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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