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| | ==TRYPAREDOXIN II FROM C.FASCICULATA solved by MR== | | ==TRYPAREDOXIN II FROM C.FASCICULATA solved by MR== |
| - | <StructureSection load='1oc9' size='340' side='right' caption='[[1oc9]], [[Resolution|resolution]] 2.35Å' scene=''> | + | <StructureSection load='1oc9' size='340' side='right'caption='[[1oc9]], [[Resolution|resolution]] 2.35Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[1oc9]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Crifa Crifa]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1OC9 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1OC9 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[1oc9]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Crithidia_fasciculata Crithidia fasciculata]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1OC9 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1OC9 FirstGlance]. <br> |
| - | </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1fg4|1fg4]], [[1i5g|1i5g]], [[1o6j|1o6j]], [[1o81|1o81]], [[1oc8|1oc8]]</td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.35Å</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=1oc9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1oc9 OCA], [http://pdbe.org/1oc9 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1oc9 RCSB], [http://www.ebi.ac.uk/pdbsum/1oc9 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1oc9 ProSAT]</span></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=1oc9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1oc9 OCA], [https://pdbe.org/1oc9 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1oc9 RCSB], [https://www.ebi.ac.uk/pdbsum/1oc9 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1oc9 ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | + | == Function == |
| | + | [https://www.uniprot.org/uniprot/O77093_CRIFA O77093_CRIFA] |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Crifa]] | + | [[Category: Crithidia fasciculata]] |
| - | [[Category: Hunter, W N]] | + | [[Category: Large Structures]] |
| - | [[Category: Leonard, G A]] | + | [[Category: Hunter WN]] |
| - | [[Category: Micossi, E]] | + | [[Category: Leonard GA]] |
| - | [[Category: Electron transport]] | + | [[Category: Micossi E]] |
| - | [[Category: Tryparedoxin ii]]
| + | |
| Structural highlights
Function
O77093_CRIFA
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
Tryparedoxin (TryX) is a member of the thioredoxin (TrX) fold family involved in the regulation of oxidative stress in parasitic trypanosomatids. Like TrX, TryX carries a characteristic Trp-Cys-Xaa-Xaa-Cys motif, which positions a redox-active disulfide underneath a tryptophan lid. We report the structure of a Crithidia fasciculata tryparedoxin isoform (CfTryX2) in two crystal forms and compare them with structures determined previously. Efforts to chemically generate crystals of reduced TryX1 were unsuccessful, and we carried out a novel experiment to break the redox-active disulfide, formed between Cys-40 and Cys-43, utilizing the intense x-radiation from a third generation synchrotron undulator beamline. A time course study of the S-S bond cleavage is reported with the structure of a TryX1 C43A mutant as the control. When freed from the constraints of a disulfide link to Cys-43, Cys-40 pivots to become slightly more solvent-accessible. In addition, we have determined the structure of Trypanosoma brucei TryX, which, influenced by the molecular packing in the crystal lattice, displays a significantly different orientation of the active site tryptophan lid. This structural change may be of functional significance when TryX interacts with tryparedoxin peroxidase, the final protein in the trypanothione-dependent peroxidase pathway. Comparisons with chloroplast TrX and its substrate fructose 1,6-bisphosphate phosphatase suggest that this movement may represent a general feature of redox regulation in the trypanothione and thioredoxin peroxidase pathways.
Tryparedoxins from Crithidia fasciculata and Trypanosoma brucei: photoreduction of the redox disulfide using synchrotron radiation and evidence for a conformational switch implicated in function.,Alphey MS, Gabrielsen M, Micossi E, Leonard GA, McSweeney SM, Ravelli RB, Tetaud E, Fairlamb AH, Bond CS, Hunter WN J Biol Chem. 2003 Jul 11;278(28):25919-25. Epub 2003 Apr 21. PMID:12707277[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Alphey MS, Gabrielsen M, Micossi E, Leonard GA, McSweeney SM, Ravelli RB, Tetaud E, Fairlamb AH, Bond CS, Hunter WN. Tryparedoxins from Crithidia fasciculata and Trypanosoma brucei: photoreduction of the redox disulfide using synchrotron radiation and evidence for a conformational switch implicated in function. J Biol Chem. 2003 Jul 11;278(28):25919-25. Epub 2003 Apr 21. PMID:12707277 doi:10.1074/jbc.M301526200
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