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2ie2

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{{STRUCTURE_2ie2| PDB=2ie2 | SCENE= }}
{{STRUCTURE_2ie2| PDB=2ie2 | SCENE= }}
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'''The 1.7 A crystal structure of Dronpa: a photoswitchable green fluorescent protein'''
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===The 1.7 A crystal structure of Dronpa: a photoswitchable green fluorescent protein===
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==Overview==
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The green fluorescent protein (GFP), its variants, and the closely related GFP-like proteins possess a wide variety of spectral properties that are of widespread interest as biological tools. One desirable spectral property, termed photoswitching, involves the light-induced alteration of the optical properties of certain GFP members. Although the structural basis of both reversible and irreversible photoswitching events have begun to be unraveled, the mechanisms resulting in reversible photoswitching are less clear. A novel GFP-like protein, Dronpa, was identified to have remarkable light-induced photoswitching properties, maintaining an almost perfect reversible photochromic behavior with a high fluorescence to dark state ratio. We have crystallized and subsequently determined to 1.7 A resolution the crystal structure of the fluorescent state of Dronpa. The chromophore was observed to be in its anionic form, adopting a cis co-planar conformation. Comparative structural analysis of non-photoactivatable and photoactivatable GFPs, together with site-directed mutagenesis of a position (Cys62) within the Dronpa chromophore, has provided a basis for understanding Dronpa photoactivation. Specifically, we propose a model of reversible photoactivation whereby irradiation with light leads to subtle conformational changes within and around the environment of the chromophore that promotes proton transfer along an intricate polar network.
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{{ABSTRACT_PUBMED_17010376}}
==About this Structure==
==About this Structure==
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[[Category: Wilmann, P G.]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 23:08:11 2008''

Revision as of 20:08, 27 July 2008

Image:2ie2.png

Template:STRUCTURE 2ie2

The 1.7 A crystal structure of Dronpa: a photoswitchable green fluorescent protein

Template:ABSTRACT PUBMED 17010376

About this Structure

2IE2 is a Single protein structure of sequence from Echinophyllia sp. sc22. Full crystallographic information is available from OCA.

Reference

The 1.7 A crystal structure of Dronpa: a photoswitchable green fluorescent protein., Wilmann PG, Turcic K, Battad JM, Wilce MC, Devenish RJ, Prescott M, Rossjohn J, J Mol Biol. 2006 Nov 24;364(2):213-24. Epub 2006 Sep 3. PMID:17010376

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