1mgy

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(New page: 200px<br /><applet load="1mgy" size="450" color="white" frame="true" align="right" spinBox="true" caption="1mgy, resolution 2.0&Aring;" /> '''Structure of the D85S...)
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'''Structure of the D85S mutant of bacteriorhodopsin with bromide bound'''<br />
'''Structure of the D85S mutant of bacteriorhodopsin with bromide bound'''<br />
==Overview==
==Overview==
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We report the crystal structure of a bromide-bound form of the D85S mutant, of bacteriorhodopsin, bR(D85S), a protein that uses light energy rather, than ATP to pump halide ions across the cell membrane. Comparison of the, structure of the halide-bound and halide-free states reveals that both, displacements of individual side-chain positions and concerted helical, movements occur on the extracellular side of the protein. Analysis of, these structural changes reveals how this ion pump first facilitates ion, uptake deep within the cell membrane and then prevents the backward escape, of ions later in the pumping cycle. Together with the information provided, by structures of intermediate states in the bacteriorhodopsin photocycle, this study also suggests the overall design principles that are necessary, for ion pumping.
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We report the crystal structure of a bromide-bound form of the D85S mutant of bacteriorhodopsin, bR(D85S), a protein that uses light energy rather than ATP to pump halide ions across the cell membrane. Comparison of the structure of the halide-bound and halide-free states reveals that both displacements of individual side-chain positions and concerted helical movements occur on the extracellular side of the protein. Analysis of these structural changes reveals how this ion pump first facilitates ion uptake deep within the cell membrane and then prevents the backward escape of ions later in the pumping cycle. Together with the information provided by structures of intermediate states in the bacteriorhodopsin photocycle, this study also suggests the overall design principles that are necessary for ion pumping.
==About this Structure==
==About this Structure==
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1MGY is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Halobacterium_salinarum Halobacterium salinarum] with BR, K, RET and LI1 as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1MGY OCA].
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1MGY is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Halobacterium_salinarum Halobacterium salinarum] with <scene name='pdbligand=BR:'>BR</scene>, <scene name='pdbligand=K:'>K</scene>, <scene name='pdbligand=RET:'>RET</scene> and <scene name='pdbligand=LI1:'>LI1</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MGY OCA].
==Reference==
==Reference==
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[[Category: Halobacterium salinarum]]
[[Category: Halobacterium salinarum]]
[[Category: Single protein]]
[[Category: Single protein]]
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[[Category: Cheung, V.S.]]
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[[Category: Cheung, V S.]]
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[[Category: Facciotti, M.T.]]
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[[Category: Facciotti, M T.]]
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[[Category: Glaeser, R.M.]]
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[[Category: Glaeser, R M.]]
[[Category: Nguyen, D.]]
[[Category: Nguyen, D.]]
[[Category: Rouhani, S.]]
[[Category: Rouhani, S.]]
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[[Category: pump]]
[[Category: pump]]
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Tue Nov 20 21:24:37 2007''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:55:03 2008''

Revision as of 11:55, 21 February 2008

Image:1mgy.gif

1mgy, resolution 2.0Å

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Structure of the D85S mutant of bacteriorhodopsin with bromide bound

Overview

We report the crystal structure of a bromide-bound form of the D85S mutant of bacteriorhodopsin, bR(D85S), a protein that uses light energy rather than ATP to pump halide ions across the cell membrane. Comparison of the structure of the halide-bound and halide-free states reveals that both displacements of individual side-chain positions and concerted helical movements occur on the extracellular side of the protein. Analysis of these structural changes reveals how this ion pump first facilitates ion uptake deep within the cell membrane and then prevents the backward escape of ions later in the pumping cycle. Together with the information provided by structures of intermediate states in the bacteriorhodopsin photocycle, this study also suggests the overall design principles that are necessary for ion pumping.

About this Structure

1MGY is a Single protein structure of sequence from Halobacterium salinarum with , , and as ligands. Full crystallographic information is available from OCA.

Reference

Crystal structure of the bromide-bound D85S mutant of bacteriorhodopsin: principles of ion pumping., Facciotti MT, Cheung VS, Nguyen D, Rouhani S, Glaeser RM, Biophys J. 2003 Jul;85(1):451-8. PMID:12829500

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