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. 1985 Jan;47(1):43–54. doi: 10.1016/S0006-3495(85)83875-3

Excited-state dynamics of bacteriorhodopsin.

T Kouyama, K Kinosita Jr, A Ikegami
PMCID: PMC1435072  PMID: 3978189

Abstract

Near infrared emission of bacteriorhodopsin at neutral pH and at room temperature was characterized by a large Stokes shift. This characteristic was lost in an acidic pH (approximately pH 2) where a remarkable enchancement (more than 10 times) in the fluorescence quantum yield accompanied the red shift in the main absorption band. It is suggested from fluorescence polarization measurements that the emission occurs from the first allowed excited state of the retinylidene chromophore, irrespective of pH. We suggest that the large Stokes shift observed at neutral pH is a result of a charge displacement (e.g., proton translocation) that occurs immediately after excitation, and is prevented by protonation (in the ground state) of an amino-acid residue in the protein.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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