2fwq

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{{STRUCTURE_2fwq| PDB=2fwq | SCENE= }}
{{STRUCTURE_2fwq| PDB=2fwq | SCENE= }}
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'''Reduced enolate chromophore intermediate for Y66H GFP variant'''
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===Reduced enolate chromophore intermediate for Y66H GFP variant===
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==Overview==
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The Aequorea victoria green fluorescent protein (GFP) creates a fluorophore from its component amino acids Ser65, Tyr66, and Gly67 through a remarkable post-translational modification, involving spontaneous peptide backbone cyclization, dehydration, and oxidation reactions. Here we test and extend the understanding of fluorophore biosynthesis by coupling chemical reduction and anaerobic methodologies with kinetic analyses and protein structure determination. Two high-resolution structures of dithionite-treated GFP variants reveal a previously uncharacterized enolate intermediate form of the chromophore that is viable in generating a fluorophore (t1/2 = 39 min-1) upon exposure to air. Isolation of this enolate intermediate will now allow specific probing of the rate-limiting oxidation step for fluorophore biosynthesis in GFP and its red fluorescent protein homologues. Such targeted characterizations may lead to the design of faster maturing proteins with enhanced applications in biotechnology and cell biology. Moreover, our results reveal how the GFP protein environment mimics enzyme systems, by stabilizing an otherwise high energy enolate intermediate to achieve its post-translational modification.
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(as it appears on PubMed at http://www.pubmed.gov), where 16522096 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16522096}}
==About this Structure==
==About this Structure==
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[[Category: Enolate]]
[[Category: Enolate]]
[[Category: Intermediate]]
[[Category: Intermediate]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 04:23:51 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 07:15:46 2008''

Revision as of 04:15, 29 July 2008

Image:2fwq.png

Template:STRUCTURE 2fwq

Reduced enolate chromophore intermediate for Y66H GFP variant

Template:ABSTRACT PUBMED 16522096

About this Structure

2FWQ is a Single protein structure of sequence from Aequorea victoria. Full crystallographic information is available from OCA.

Reference

Structural evidence for an enolate intermediate in GFP fluorophore biosynthesis., Barondeau DP, Tainer JA, Getzoff ED, J Am Chem Soc. 2006 Mar 15;128(10):3166-8. PMID:16522096

Page seeded by OCA on Tue Jul 29 07:15:46 2008

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