6533b7d8fe1ef96bd126b718
RESEARCH PRODUCT
Crystal structures of bR(D85S) favor a model of bacteriorhodopsin as a hydroxyl-ion pump
Robert M. GlaeserRobert M. GlaeserMarc T. FacciottiShahab Rouhanisubject
Models MolecularProtein ConformationAnion Transport ProteinsBiophysicsBacteriorhodopsinProtonationCrystal structureCrystallography X-RayBiochemistryIon pumpIonchemistry.chemical_compoundResidue (chemistry)Structural BiologyMutant proteinHydroxidesGeneticsMolecular BiologyIon TransportSchiff basebiologyChemistryBacteriorhodopsinCell BiologyCrystallographyIon pumpBacteriorhodopsinsMutationbiology.proteinHydroxyl ionProtonsdescription
AbstractStructural features on the extracellular side of the D85S mutant of bacteriorhodopsin (bR) suggest that wild-type bR could be a hydroxyl-ion pump. A position between the protonated Schiff base and residue 85 serves as an anion-binding site in the mutant protein, and hydroxyl ions should have access to this site during the O-intermediate of the wild-type bR photocycle. The guanidinium group of R82 is proposed (1) to serve as a shuttle that eliminates the Born energy penalty for entry of an anion into this binding pocket, and conversely, (2) to block the exit of a proton or a related proton carrier.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2003-12-22 | FEBS Letters |