WFRF:(Neutze Richard)
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Structural Dynamics of Light-Driven Proton Pumps
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- Andersson, Magnus (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Malmerberg, Erik, 1980 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för kemi,Department of Chemistry
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- Westenhoff, Sebastian, 1978 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för kemi,Department of Chemistry
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- (creator_code:org_t)
- Elsevier BV, 2009
- 2009
- English.
- In: Structure. - : Elsevier BV. - 0969-2126 .- 1878-4186. ; 17:9, s. 1265-1275
- Journal article (peer-reviewed)
Abstract
Subject headings
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- Bacteriorhodopsin and proteorhodopsin are simple heptahelical proton pumps containing a retinal chromophore covalently bound to helix G via a protonated Schiff base. Following the absorption of a photon, all-trans retinal is isomerized to a 13-cis conformation, initiating a sequence of conformational changes driving vectorial proton transport. In this study we apply time-resolved wide-angle X-ray scattering to visualize in real time the helical motions associated with proton pumping by bacteriorhodopsin and proteorhodopsin. Our results establish that three conformational states are required to describe their photocycles. Significant motions of the cytoplasmic half of helix F and the extracellular half of helix C are observed prior to the primary proton transfer event, which increase in amplitude following proton transfer. These results both simplify the structural description to emerge from intermediate trapping studies of bacteriorhodopsin and reveal shared dynamical principles for proton pumping.
Subject headings
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Keyword
- Chemistry
- Kemi
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Articles in the publication
- Structure
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- Uppsala University
- Chalmers University of Technology
- University of Gothenburg
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