View source for 3cb9


==Development of a family of redox-sensitive green fluorescent protein indicators for use in relatively oxidizing subcellular environments==
<StructureSection load='3cb9' size='340' side='right'caption='[[3cb9]], [[Resolution|resolution]] 1.31&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3cb9]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Aequorea_victoria Aequorea victoria]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3CB9 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3CB9 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]] 1.31&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CRO:{2-[(1R,2R)-1-AMINO-2-HYDROXYPROPYL]-4-(4-HYDROXYBENZYLIDENE)-5-OXO-4,5-DIHYDRO-1H-IMIDAZOL-1-YL}ACETIC+ACID'>CRO</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</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=3cb9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3cb9 OCA], [https://pdbe.org/3cb9 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3cb9 RCSB], [https://www.ebi.ac.uk/pdbsum/3cb9 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3cb9 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/GFP_AEQVI GFP_AEQVI] Energy-transfer acceptor. Its role is to transduce the blue chemiluminescence of the protein aequorin into green fluorescent light by energy transfer. Fluoresces in vivo upon receiving energy from the Ca(2+)-activated photoprotein aequorin.
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/cb/3cb9_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=3cb9 ConSurf].
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== Publication Abstract from PubMed ==
Green fluorescent protein (GFP) indicators were previously developed that rapidly and quantitatively respond to changes in the thiol/disulfide equilibrium within subcellular compartments. In these indicators, surface-exposed cysteines residues were introduced so as to form a labile redox-active disulfide that in turn controls the emission properties of the internal chromophore. The biosensors have been shown to be effective reporters of the thiol/disulfide status within reducing compartments such as the mitochondria and cytosol for several cell types. However, due to the high thermodynamic stability of the introduced disulfide bond, the indicators are not useful for quantitative analysis within more oxidizing compartments such as the endoplasmic reticulum. Here we report the development of a new family of GFP-based redox indicators (roGFP1-iX) in which the thermodynamic stability of the disulfide is substantially lowered by insertion of a single amino acid into the main chain, adjacent to cysteine 147. The insertions result in indicators with midpoint potentials of -229 to -246 mV and are thus better suited for study of relatively oxidizing subcellular compartments. Atomic resolution crystallographic analyses suggest that two important factors act to destabilize the disulfide linkage in roGFP1-iX. In the oxidized state, an unusual non-proline cis-peptide bond adjacent to one of the cysteines introduces geometric strain into the system, while in the reduced state, a dramatic loop opening lowers the effective concentration of the reacting species.

Development of a family of redox-sensitive green fluorescent protein indicators for use in relatively oxidizing subcellular environments.,Lohman JR, Remington SJ Biochemistry. 2008 Aug 19;47(33):8678-88. Epub 2008 Jul 25. PMID:18652491<ref>PMID:18652491</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 3cb9" style="background-color:#fffaf0;"></div>

==See Also==
*[[Green Fluorescent Protein 3D structures|Green Fluorescent Protein 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Aequorea victoria]]
[[Category: Large Structures]]
[[Category: Lohman JR]]