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2at9

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[[Image:2at9.gif|left|200px]]
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{{STRUCTURE_2at9| PDB=2at9 | SCENE= }}
{{STRUCTURE_2at9| PDB=2at9 | SCENE= }}
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'''STRUCTURE OF BACTERIORHODOPSIN AT 3.0 ANGSTROM BY ELECTRON CRYSTALLOGRAPHY'''
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===STRUCTURE OF BACTERIORHODOPSIN AT 3.0 ANGSTROM BY ELECTRON CRYSTALLOGRAPHY===
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==Overview==
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Electron crystallography has the potential to visualise the charge status of atoms. This is due to the significantly different scattering factors of neutral and ionised atoms for electrons in the low-resolution range (typically less than 5 A). In previous work, we observed two different types of densities around acidic residues in the experimental (|Fo|) map of bacteriorhodopsin (bR), a light-driven proton pump. We suggested that these might reflect different states of the acidic residues; namely, the protonated (neutral) and the deprotonated (negatively charged) state. To evaluate the observed charge more quantitatively, we refined the atomic model for bR and eight surrounding lipids using our electron crystallographic data set between 8.0 and 3.0 A resolution, where the charge effect is small. The refined model yielded an R-factor of 23.7% and a free R-factor of 33.0%. To evaluate the effect of charges on the density map, we calculated a difference (|Fo|-|Fc|) map including data of a resolution lower than 8.0 A resolution, where the charge effect is significant. We found strong peaks in the difference map mainly in the backbone region of the transmembrane helices. We interpreted these peaks to come from the polarisation of the polar groups in the main chain of the alpha-helices and we examined this by assuming a partial charge of 0.5 for the peptide carbonyl groups. The resulting R and free R-factors dropped from 0.250 and 0.341 to 0.246 and 0.336, respectively. Furthermore, we also observed some strong peaks around some side-chains, which could be assigned to positively charged atoms. Thus, we could show that Asp36 and Asp102 are likely to interact with cations nearby. In addition, peaks found around the acidic residues Glu74, Glu194 and Glu212 have different features and might represent positive charges on polarised water molecules or hydroxonium ions.
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{{ABSTRACT_PUBMED_10024456}}
==About this Structure==
==About this Structure==
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[[Category: Retinal protein]]
[[Category: Retinal protein]]
[[Category: Two-dimensional crystal]]
[[Category: Two-dimensional crystal]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 19:26:57 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 04:35:19 2008''

Revision as of 01:35, 28 July 2008

Image:2at9.png

Template:STRUCTURE 2at9

STRUCTURE OF BACTERIORHODOPSIN AT 3.0 ANGSTROM BY ELECTRON CRYSTALLOGRAPHY

Template:ABSTRACT PUBMED 10024456

About this Structure

2AT9 is a Single protein structure of sequence from Halobacterium salinarum. Full crystallographic information is available from OCA.

Reference

The structure of bacteriorhodopsin at 3.0 A resolution based on electron crystallography: implication of the charge distribution., Mitsuoka K, Hirai T, Murata K, Miyazawa A, Kidera A, Kimura Y, Fujiyoshi Y, J Mol Biol. 1999 Feb 26;286(3):861-82. PMID:10024456

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