1huy

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{{STRUCTURE_1huy| PDB=1huy | SCENE= }}
{{STRUCTURE_1huy| PDB=1huy | SCENE= }}
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'''CRYSTAL STRUCTURE OF CITRINE, AN IMPROVED YELLOW VARIANT OF GREEN FLUORESCENT PROTEIN'''
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===CRYSTAL STRUCTURE OF CITRINE, AN IMPROVED YELLOW VARIANT OF GREEN FLUORESCENT PROTEIN===
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==Overview==
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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.
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(as it appears on PubMed at http://www.pubmed.gov), where 11387331 is the PubMed ID number.
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{{ABSTRACT_PUBMED_11387331}}
==About this Structure==
==About this Structure==
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[[Category: Beta barrel]]
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[[Category: Chromophore]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 19:15:28 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 08:47:21 2008''

Revision as of 05:47, 1 July 2008

Image:1huy.png

Template:STRUCTURE 1huy

CRYSTAL STRUCTURE OF CITRINE, AN IMPROVED YELLOW VARIANT OF GREEN FLUORESCENT PROTEIN

Template:ABSTRACT PUBMED 11387331

About this Structure

1HUY is a Single protein structure of sequence from Aequorea victoria. Full crystallographic information is available from OCA.

Reference

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

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