1e0p
From Proteopedia
| Line 1: | Line 1: | ||
| - | [[Image:1e0p.jpg|left|200px]] | + | [[Image:1e0p.jpg|left|200px]] |
| - | + | ||
| - | '''L INTERMEDIATE OF BACTERIORHODOPSIN''' | + | {{Structure |
| + | |PDB= 1e0p |SIZE=350|CAPTION= <scene name='initialview01'>1e0p</scene>, resolution 2.1Å | ||
| + | |SITE= <scene name='pdbsite=AC1:Ret+Binding+Site+For+Chain+A'>AC1</scene> and <scene name='pdbsite=AC2:Ret+Binding+Site+For+Chain+B'>AC2</scene> | ||
| + | |LIGAND= <scene name='pdbligand=RET:RETINAL'>RET</scene> | ||
| + | |ACTIVITY= | ||
| + | |GENE= | ||
| + | }} | ||
| + | |||
| + | '''L INTERMEDIATE OF BACTERIORHODOPSIN''' | ||
| + | |||
==Overview== | ==Overview== | ||
| Line 7: | Line 16: | ||
==About this Structure== | ==About this Structure== | ||
| - | 1E0P is a [ | + | 1E0P is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Halobacterium_salinarum Halobacterium salinarum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1E0P OCA]. |
==Reference== | ==Reference== | ||
| - | Helix deformation is coupled to vectorial proton transport in the photocycle of bacteriorhodopsin., Royant A, Edman K, Ursby T, Pebay-Peyroula E, Landau EM, Neutze R, Nature. 2000 Aug 10;406(6796):645-8. PMID:[http:// | + | Helix deformation is coupled to vectorial proton transport in the photocycle of bacteriorhodopsin., Royant A, Edman K, Ursby T, Pebay-Peyroula E, Landau EM, Neutze R, Nature. 2000 Aug 10;406(6796):645-8. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/10949307 10949307] |
[[Category: Halobacterium salinarum]] | [[Category: Halobacterium salinarum]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
| Line 25: | Line 34: | ||
[[Category: transmembrane]] | [[Category: transmembrane]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 10:47:33 2008'' |
Revision as of 08:47, 20 March 2008
| |||||||
| , resolution 2.1Å | |||||||
|---|---|---|---|---|---|---|---|
| Sites: | and | ||||||
| Ligands: | |||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
L INTERMEDIATE OF BACTERIORHODOPSIN
Overview
A wide variety of mechanisms are used to generate a proton-motive potential across cell membranes, a function lying at the heart of bioenergetics. Bacteriorhodopsin, the simplest known proton pump, provides a paradigm for understanding this process. Here we report, at 2.1 A resolution, the structural changes in bacteriorhodopsin immediately preceding the primary proton transfer event in its photocycle. The early structural rearrangements propagate from the protein's core towards the extracellular surface, disrupting the network of hydrogen-bonded water molecules that stabilizes helix C in the ground state. Concomitantly, a bend of this helix enables the negatively charged primary proton acceptor, Asp 85, to approach closer to the positively charged primary proton donor, the Schiff base. The primary proton transfer event would then neutralize these two groups, cancelling their electrostatic attraction and facilitating a relaxation of helix C to a less strained geometry. Reprotonation of the Schiff base by Asp 85 would thereby be impeded, ensuring vectorial proton transport. Structural rearrangements also occur near the protein's surface, aiding proton release to the extracellular medium.
About this Structure
1E0P is a Single protein structure of sequence from Halobacterium salinarum. Full crystallographic information is available from OCA.
Reference
Helix deformation is coupled to vectorial proton transport in the photocycle of bacteriorhodopsin., Royant A, Edman K, Ursby T, Pebay-Peyroula E, Landau EM, Neutze R, Nature. 2000 Aug 10;406(6796):645-8. PMID:10949307
Page seeded by OCA on Thu Mar 20 10:47:33 2008
