2c9j
From Proteopedia
| Line 1: | Line 1: | ||
[[Image:2c9j.gif|left|200px]] | [[Image:2c9j.gif|left|200px]] | ||
| - | + | <!-- | |
| - | + | The line below this paragraph, containing "STRUCTURE_2c9j", creates the "Structure Box" on the page. | |
| - | + | You may change the PDB parameter (which sets the PDB file loaded into the applet) | |
| - | + | or the SCENE parameter (which sets the initial scene displayed when the page is loaded), | |
| - | | | + | or leave the SCENE parameter empty for the default display. |
| - | | | + | --> |
| - | + | {{STRUCTURE_2c9j| PDB=2c9j | SCENE= }} | |
| - | + | ||
| - | + | ||
| - | }} | + | |
'''STRUCTURE OF THE FLUORESCENT PROTEIN CMFP512 AT 1.35A FROM CERIANTHUS MEMBRANACEUS''' | '''STRUCTURE OF THE FLUORESCENT PROTEIN CMFP512 AT 1.35A FROM CERIANTHUS MEMBRANACEUS''' | ||
| Line 30: | Line 27: | ||
[[Category: Vallone, B.]] | [[Category: Vallone, B.]] | ||
[[Category: Wiedenmann, J.]] | [[Category: Wiedenmann, J.]] | ||
| - | [[Category: | + | [[Category: Beta-barrel]] |
| - | [[Category: | + | [[Category: Bioluminescence]] |
| - | [[Category: | + | [[Category: Fluorescent protein]] |
| - | [[Category: | + | [[Category: Luminescence]] |
| - | [[Category: | + | [[Category: Luminescent protein]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 21:30:45 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 18:30, 3 May 2008
STRUCTURE OF THE FLUORESCENT PROTEIN CMFP512 AT 1.35A FROM CERIANTHUS MEMBRANACEUS
Overview
Autofluorescent proteins of the GFP family all share the same three-dimensional beta-can fold; yet they exhibit widely different optical properties, arising either from chemical modification of the chromophore itself or from specific interactions of the chromophore with the surrounding protein moiety. Here we present a structural and spectroscopic characterization of the green fluorescent protein cmFP512 from Cerianthus membranaceus, a nonbioluminescent, azooxanthellate cnidarian, which has only approximately 22% sequence identity with Aequorea victoria GFP. The X-ray structure, obtained by molecular replacement at a resolution of 1. 35 A, shows the chromophore, formed from the tripeptide Gln-Tyr-Gly, in a hydrogen-bonded cage in the center of an 11-stranded beta-barrel, tightly restrained by adjacent residues and structural water molecules. It exists in a neutral (A) and an anionic (B) species, with absorption/emission maxima at 392/460 (pH 5) and 503/512 nm (pH 7). Their fractional populations and peak positions depend sensitively on pH, reflecting protonation of groups adjacent to the chromophore. The pH dependence of the spectra is explained by a protonation mechanism involving a hydrogen-bonded cluster of charged/polar groups. Cryospectroscopy at 12 K was also performed to analyze the vibronic coupling of the electronic transitions.
About this Structure
2C9J is a Single protein structure of sequence from Cerianthus membranaceus. Full crystallographic information is available from OCA.
Reference
Exploring chromophore--protein interactions in fluorescent protein cmFP512 from Cerianthus membranaceus: X-ray structure analysis and optical spectroscopy., Nienhaus K, Renzi F, Vallone B, Wiedenmann J, Nienhaus GU, Biochemistry. 2006 Oct 31;45(43):12942-53. PMID:17059211 Page seeded by OCA on Sat May 3 21:30:45 2008
