View source for 3pj5


==Crystal structure of far-red fluorescent protein Katushka crystallized at pH 5.0==
<StructureSection load='3pj5' size='340' side='right'caption='[[3pj5]], [[Resolution|resolution]] 1.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3pj5]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Entacmaea_quadricolor Entacmaea quadricolor]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3PJ5 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3PJ5 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]] 1.6&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NRQ:{(4Z)-4-(4-HYDROXYBENZYLIDENE)-2-[3-(METHYLTHIO)PROPANIMIDOYL]-5-OXO-4,5-DIHYDRO-1H-IMIDAZOL-1-YL}ACETIC+ACID'>NRQ</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=3pj5 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3pj5 OCA], [https://pdbe.org/3pj5 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3pj5 RCSB], [https://www.ebi.ac.uk/pdbsum/3pj5 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3pj5 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/H3JQU5_ENTQU H3JQU5_ENTQU] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The wild type red fluorescent protein eqFP578 (from sea anemone Entacmaea quadricolor, lambdaex = 552 nm, lambdaem = 578 nm) and its bright far-red fluorescent variant Katushka (lambdaex = 588 nm, lambdaem = 635 nm) are characterized by the pronounced pH dependence of their fluorescence. The crystal structures of eqFP578f (eqFP578 with two point mutations improving the protein folding) and Katushka have been determined at the resolution ranging from 1.15 to 1.85 A at two pH values, corresponding to low and high level of fluorescence. The observed extinguishing of fluorescence upon reducing pH in eqFP578f and Katushka has been shown to be accompanied by the opposite trans-cis and cis-trans chromophore isomerization, respectively. Asn143, Ser158, His197 and Ser143, Leu174, and Arg197 have been shown to stabilize the respective trans and cis fluorescent states of the chromophores in eqFP578f and Katushka at higher pH. The cis state has been suggested as being primarily responsible for the observed far-red shift of the emission maximum of Katushka relative to that of eqFP578f.

Crystallographic study of red fluorescent protein eqFP578 and its far-red variant Katushka reveals opposite pH-induced isomerization of chromophore.,Pletneva NV, Pletnev VZ, Shemiakina II, Chudakov DM, Artemyev I, Wlodawer A, Dauter Z, Pletnev S Protein Sci. 2011 May 11. doi: 10.1002/pro.654. PMID:21563226<ref>PMID:21563226</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 3pj5" style="background-color:#fffaf0;"></div>

==See Also==
*[[Green Fluorescent Protein 3D structures|Green Fluorescent Protein 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Entacmaea quadricolor]]
[[Category: Large Structures]]
[[Category: Pletnev S]]
[[Category: Pletnev VZ]]
[[Category: Pletneva NV]]