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. 1994 Sep;67(3):1155–1160. doi: 10.1016/S0006-3495(94)80583-1

A comparison of the second harmonic generation from light-adapted, dark-adapted, blue, and acid purple membrane.

Z Chen 1, M Sheves 1, A Lewis 1, O Bouevitch 1
PMCID: PMC1225470  PMID: 7811928

Abstract

The second order nonlinear polarizability and dipole moment changes upon light excitation of light-adapted bacteriorhodopsin (BR), dark-adapted BR, blue membrane, and acid purple membrane have been measured by second harmonic generation. Our results indicate that the dipole moment changes of the retinal chromophore, delta mu, are very sensitive to both the chromophore structure and protein/chromophore interactions. Delta mu of light-adapted BR is larger than that of dark-adapted BR. The acid-induced formation of the blue membrane results in an increase in the delta mu value, and formation of acid purple membrane, resulting from further reduction of pH to 0, returns the delta mu to that of light-adapted BR. The implications of these findings are discussed.

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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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