View source for 6aa6


==X-ray structure of ReQy1 (reduced form)==
<StructureSection load='6aa6' size='340' side='right'caption='[[6aa6]], [[Resolution|resolution]] 2.39&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6aa6]] is a 2 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=6AA6 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6AA6 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]] 2.39&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CR2:{(4Z)-2-(AMINOMETHYL)-4-[(4-HYDROXYPHENYL)METHYLIDENE]-5-OXO-4,5-DIHYDRO-1H-IMIDAZOL-1-YL}ACETIC+ACID'>CR2</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=6aa6 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6aa6 OCA], [https://pdbe.org/6aa6 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6aa6 RCSB], [https://www.ebi.ac.uk/pdbsum/6aa6 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6aa6 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.
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== Publication Abstract from PubMed ==
Change in the intracellular redox state is a consequence of various metabolic reactions, which simultaneously regulates various physiological phenomena in cells. Monitoring the redox state in living cells is thus very important for understanding cellular physiology. Various genetically encoded fluorescent redox sensors have therefore been developed. Recently, we developed oxidation-sensitive fluorescent proteins named Oba-Q (Sugiura, K., et al. (2015) Biochem. Biophys. Res. Commun. 457, 242-248), which exhibit dramatic quenching under oxidizing conditions. To extend the range of uses of redox sensor proteins, we refined these proteins based on the molecular architecture applied to Oba-Q, and successfully produced several redox sensor proteins based on CFP and YFP. Interestingly, some of these sensor proteins showed the reverse changes in emission compared with Oba-Q, implying remarkable fluorescence quenching under reducing conditions. We named this type of sensor protein Re-Q, reduction-sensed quenching protein. The cause of the redox-dependent fluorescence quenching could be clearly explained based on the crystal structure of Re-Q in the reduced and oxidized forms. In addition, by introducing suitable mutations into the sensors, we produced Oba-Q and Re-Q mutants exhibiting various midpoint redox potentials. This series of proteins can cover a wide range of redox potentials in the cell, so they should be applicable to various cells and even intracellular organelles. As an example, we successfully measured the redox responses in different cell compartments of cultured mammalian cells simultaneously against the anticancer reagents Kp372-1.

Multicolor redox sensor proteins can visualize redox changes in various compartments of the living cell.,Sugiura K, Tanaka H, Kurisu G, Wakabayashi KI, Hisabori T Biochim Biophys Acta Gen Subj. 2019 Jun;1863(6):1098-1107. doi:, 10.1016/j.bbagen.2019.01.016. Epub 2019 Apr 4. PMID:30953671<ref>PMID:30953671</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6aa6" 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: Kurisu G]]
[[Category: Tabushi N]]
[[Category: Tanaka H]]
[[Category: Yasuda A]]