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==CRYSTAL STRUCTURE OF CITRINE, AN IMPROVED YELLOW VARIANT OF GREEN FLUORESCENT PROTEIN== | |||
<StructureSection load='1huy' size='340' side='right'caption='[[1huy]], [[Resolution|resolution]] 2.20Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[1huy]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Aequorea_victoria Aequorea victoria]. The June 2014 RCSB PDB [https://pdb.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/index.html Molecule of the Month] feature on ''GFP-like Proteins'' by David Goodsell is [https://dx.doi.org/10.2210/rcsb_pdb/mom_2014_6 10.2210/rcsb_pdb/mom_2014_6]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1HUY OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1HUY 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]] 2.2Å</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></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=1huy FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1huy OCA], [https://pdbe.org/1huy PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1huy RCSB], [https://www.ebi.ac.uk/pdbsum/1huy PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1huy 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/hu/1huy_consurf.spt"</scriptWhenChecked> | |||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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=1huy ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Yellow mutants of the green fluorescent protein (YFP) are crucial constituents of genetically encoded indicators of signal transduction and fusions to monitor protein-protein interactions. However, previous YFPs show excessive pH sensitivity, chloride interference, poor photostability, or poor expression at 37 degrees C. Protein evolution in Escherichia coli has produced a new YFP named Citrine, in which the mutation Q69M confers a much lower pK(a) (5.7) than for previous YFPs, indifference to chloride, twice the photostability of previous YFPs, and much better expression at 37 degrees C and in organelles. The halide resistance is explained by a 2.2-A x-ray crystal structure of Citrine, showing that the methionine side chain fills what was once a large halide-binding cavity adjacent to the chromophore. Insertion of calmodulin within Citrine or fusion of cyan fluorescent protein, calmodulin, a calmodulin-binding peptide and Citrine has generated improved calcium indicators. These chimeras can be targeted to multiple cellular locations and have permitted the first single-cell imaging of free [Ca(2+)] in the Golgi. Citrine is superior to all previous YFPs except when pH or halide sensitivity is desired and is particularly advantageous within genetically encoded fluorescent indicators of physiological signals. | |||
Reducing the environmental sensitivity of yellow fluorescent protein. Mechanism and applications.,Griesbeck O, Baird GS, Campbell RE, Zacharias DA, Tsien RY J Biol Chem. 2001 Aug 3;276(31):29188-94. Epub 2001 May 31. PMID:11387331<ref>PMID:11387331</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 1huy" style="background-color:#fffaf0;"></div> | |||
==See Also== | ==See Also== | ||
*[[Green Fluorescent Protein 3D structures|Green Fluorescent Protein 3D structures]] | |||
== References == | |||
*[[Green Fluorescent Protein|Green Fluorescent Protein]] | <references/> | ||
__TOC__ | |||
</StructureSection> | |||
== | |||
< | |||
[[Category: Aequorea victoria]] | [[Category: Aequorea victoria]] | ||
[[Category: | [[Category: GFP-like Proteins]] | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: | [[Category: RCSB PDB Molecule of the Month]] | ||
[[Category: | [[Category: Baird GS]] | ||
[[Category: | [[Category: Campbell RE]] | ||
[[Category: | [[Category: Griesbeck O]] | ||
[[Category: | [[Category: Tsien RY]] | ||
[[Category: | [[Category: Zacharias DA]] | ||