Section 55
Chapter 54,128

Light-induced generation of electric potential difference in membranes of purple and green sulfur bacteria

Krasinskaya, N.P.; Samuilov, V.D.

Journal of Bioenergetics and Biomembranes 9(3): 171-180


ISSN/ISBN: 0145-479X
PMID: 18265514
DOI: 10.1007/bf00743191
Accession: 054127162

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When associated with a planar phospholipid membrane, chromatophores isolated from photosynthetic sulfur bacteria Chromatium minutissimum, Ectothiorhodospira shaposhnikovii, and Chlorobium limicola f. thiosulfatophilum were shown to generate a light-induced transmembrane electric potential difference measured by a direct method using macroelectrodes and a voltmeter. The maximal photoelectric responses were observed upon the addition of 1,4-naphthoquinone in combination with phenazine methosulfate (or TMPD) and ascorbate. The photoeffects were inhibited by CCCP and gramicidin. The data demonstrate that similar mechanisms of photoelectric generation function in membranes of the different bacteria studied.

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