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[[Image:2b3q.gif|left|200px]]
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{{STRUCTURE_2b3q|  PDB=2b3q  |  SCENE=  }}
'''Crystal structure of a well-folded variant of green fluorescent protein'''


==Crystal structure of a well-folded variant of green fluorescent protein==
<StructureSection load='2b3q' size='340' side='right'caption='[[2b3q]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2b3q]] is a 4 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=2B3Q OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2B3Q 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]] 2.3&#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=2b3q FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2b3q OCA], [https://pdbe.org/2b3q PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2b3q RCSB], [https://www.ebi.ac.uk/pdbsum/2b3q PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2b3q 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/b3/2b3q_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=2b3q ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Existing variants of green fluorescent protein (GFP) often misfold when expressed as fusions with other proteins. We have generated a robustly folded version of GFP, called 'superfolder' GFP, that folds well even when fused to poorly folded polypeptides. Compared to 'folding reporter' GFP, a folding-enhanced GFP containing the 'cycle-3' mutations and the 'enhanced GFP' mutations F64L and S65T, superfolder GFP shows improved tolerance of circular permutation, greater resistance to chemical denaturants and improved folding kinetics. The fluorescence of Escherichia coli cells expressing each of eighteen proteins from Pyrobaculum aerophilum as fusions with superfolder GFP was proportional to total protein expression. In contrast, fluorescence of folding reporter GFP fusion proteins was strongly correlated with the productive folding yield of the passenger protein. X-ray crystallographic structural analyses helped explain the enhanced folding of superfolder GFP relative to folding reporter GFP.


==Overview==
Engineering and characterization of a superfolder green fluorescent protein.,Pedelacq JD, Cabantous S, Tran T, Terwilliger TC, Waldo GS Nat Biotechnol. 2006 Jan;24(1):79-88. Epub 2005 Dec 20. PMID:16369541<ref>PMID:16369541</ref>
Existing variants of green fluorescent protein (GFP) often misfold when expressed as fusions with other proteins. We have generated a robustly folded version of GFP, called 'superfolder' GFP, that folds well even when fused to poorly folded polypeptides. Compared to 'folding reporter' GFP, a folding-enhanced GFP containing the 'cycle-3' mutations and the 'enhanced GFP' mutations F64L and S65T, superfolder GFP shows improved tolerance of circular permutation, greater resistance to chemical denaturants and improved folding kinetics. The fluorescence of Escherichia coli cells expressing each of eighteen proteins from Pyrobaculum aerophilum as fusions with superfolder GFP was proportional to total protein expression. In contrast, fluorescence of folding reporter GFP fusion proteins was strongly correlated with the productive folding yield of the passenger protein. X-ray crystallographic structural analyses helped explain the enhanced folding of superfolder GFP relative to folding reporter GFP.


==About this Structure==
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
2B3Q is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Aequorea_victoria Aequorea victoria]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2B3Q OCA].
</div>
<div class="pdbe-citations 2b3q" style="background-color:#fffaf0;"></div>


==Reference==
==See Also==
Engineering and characterization of a superfolder green fluorescent protein., Pedelacq JD, Cabantous S, Tran T, Terwilliger TC, Waldo GS, Nat Biotechnol. 2006 Jan;24(1):79-88. Epub 2005 Dec 20. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/16369541 16369541]
*[[Green Fluorescent Protein 3D structures|Green Fluorescent Protein 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Aequorea victoria]]
[[Category: Aequorea victoria]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Cabantous, S.]]
[[Category: Cabantous S]]
[[Category: Pedelacq, J D.]]
[[Category: Pedelacq JD]]
[[Category: Terwilliger, T C.]]
[[Category: Terwilliger TC]]
[[Category: Tran, T H.]]
[[Category: Tran TH]]
[[Category: Waldo, G S.]]
[[Category: Waldo GS]]
[[Category: 11-stranded beta-barrel]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 19:48:56 2008''

Latest revision as of 08:00, 19 March 2026

Crystal structure of a well-folded variant of green fluorescent protein

2b3q, resolution 2.30Å

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