4mkn: Difference between revisions
New page: '''Unreleased structure''' The entry 4mkn is ON HOLD Authors: Fermani, S., Sciabolini, C., Zaffagnini, M., Lemaire, S.D. Description: Crystal structure of chloroplastic triosephosphate... |
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The | ==Crystal structure of chloroplastic triosephosphate isomerase from Chlamydomonas reinhardtii at 1.1 A of resolution== | ||
<StructureSection load='4mkn' size='340' side='right'caption='[[4mkn]], [[Resolution|resolution]] 1.10Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[4mkn]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Chlamydomonas_reinhardtii Chlamydomonas reinhardtii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4MKN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4MKN 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]] 1.1Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MPD:(4S)-2-METHYL-2,4-PENTANEDIOL'>MPD</scene>, <scene name='pdbligand=MRD:(4R)-2-METHYLPENTANE-2,4-DIOL'>MRD</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=4mkn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4mkn OCA], [https://pdbe.org/4mkn PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4mkn RCSB], [https://www.ebi.ac.uk/pdbsum/4mkn PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4mkn ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/Q5S7Y5_CHLRE Q5S7Y5_CHLRE] | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Triosephosphate isomerase (TPI) catalyzes the interconversion of glyceraldehyde-3-phosphate to dihydroxyacetone phosphate. Photosynthetic organisms generally contain two isoforms of TPI located in both cytoplasm and chloroplasts. While the cytoplasmic TPI is involved in the glycolysis, the chloroplastic isoform participates in the Calvin-Benson cycle, a key photosynthetic process responsible for carbon fixation. Compared with its cytoplasmic counterpart, the functional features of chloroplastic TPI have been poorly investigated and its three-dimensional structure has not been solved. Recently, several studies proposed TPI as a potential target of different redox modifications including dithiol/disulfide interchanges, glutathionylation, and nitrosylation. However, neither the effects on protein activity nor the molecular mechanisms underlying these redox modifications have been investigated. Here, we have produced recombinantly and purified TPI from the unicellular green alga Chlamydomonas reinhardtii (Cr). The biochemical properties of the enzyme were delineated and its crystallographic structure was determined at a resolution of 1.1 A. CrTPI is a homodimer with subunits containing the typical (beta/alpha)8-barrel fold. Although no evidence for TRX regulation was obtained, CrTPI was found to undergo glutathionylation by oxidized glutathione and trans-nitrosylation by nitrosoglutathione, confirming its sensitivity to multiple redox modifications. | |||
High-Resolution Crystal Structure and Redox Properties of Chloroplastic Triosephosphate Isomerase from Chlamydomonas reinhardtii.,Zaffagnini M, Michelet L, Sciabolini C, Giacinto ND, Morisse S, Marchand CH, Trost P, Fermani S, Lemaire SD Mol Plant. 2013 Nov 5. PMID:24157611<ref>PMID:24157611</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 4mkn" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Triose phosphate isomerase 3D structures|Triose phosphate isomerase 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Chlamydomonas reinhardtii]] | |||
[[Category: Large Structures]] | |||
[[Category: Fermani S]] | |||
[[Category: Lemaire SD]] | |||
[[Category: Sciabolini C]] | |||
[[Category: Zaffagnini M]] | |||
Latest revision as of 19:38, 20 September 2023
Crystal structure of chloroplastic triosephosphate isomerase from Chlamydomonas reinhardtii at 1.1 A of resolutionCrystal structure of chloroplastic triosephosphate isomerase from Chlamydomonas reinhardtii at 1.1 A of resolution
Structural highlights
FunctionPublication Abstract from PubMedTriosephosphate isomerase (TPI) catalyzes the interconversion of glyceraldehyde-3-phosphate to dihydroxyacetone phosphate. Photosynthetic organisms generally contain two isoforms of TPI located in both cytoplasm and chloroplasts. While the cytoplasmic TPI is involved in the glycolysis, the chloroplastic isoform participates in the Calvin-Benson cycle, a key photosynthetic process responsible for carbon fixation. Compared with its cytoplasmic counterpart, the functional features of chloroplastic TPI have been poorly investigated and its three-dimensional structure has not been solved. Recently, several studies proposed TPI as a potential target of different redox modifications including dithiol/disulfide interchanges, glutathionylation, and nitrosylation. However, neither the effects on protein activity nor the molecular mechanisms underlying these redox modifications have been investigated. Here, we have produced recombinantly and purified TPI from the unicellular green alga Chlamydomonas reinhardtii (Cr). The biochemical properties of the enzyme were delineated and its crystallographic structure was determined at a resolution of 1.1 A. CrTPI is a homodimer with subunits containing the typical (beta/alpha)8-barrel fold. Although no evidence for TRX regulation was obtained, CrTPI was found to undergo glutathionylation by oxidized glutathione and trans-nitrosylation by nitrosoglutathione, confirming its sensitivity to multiple redox modifications. High-Resolution Crystal Structure and Redox Properties of Chloroplastic Triosephosphate Isomerase from Chlamydomonas reinhardtii.,Zaffagnini M, Michelet L, Sciabolini C, Giacinto ND, Morisse S, Marchand CH, Trost P, Fermani S, Lemaire SD Mol Plant. 2013 Nov 5. PMID:24157611[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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