Title: The light-harvesting complexes of a thermophilic purple sulfur photosynthetic bacterium Chromatium tepidum
Abstract: Several biophysical properties (absorption, fluorescence, linear dichroism) are reported for the chromatophore membranes of the thermophilic purple sulfur bacterium, Chromatium tepidum. Like the mesophilic strain Chromatium vinosum, two types of light-harvesting complex are present: one absorbs at 800 nm and 855 nm; the second complex is equivalent to the B890 complex of C. vinosum, but absorbs at 918 nm, i.e., 30 nm higher. This is the highest absorption band observed so far for a light-harvesting complex containing bacteriochlorophyll a. In spite of the small overlap between the fluorescence and absorption bands of the two light-harvesting complexes, specially at low temperature, an efficient energy transfer occurs from the high-energy (B800–855) to the low-energy (B920) complexes. The B800–855 complexes have been isolated from the whole membrane by lauryldimethylamine N-oxide treatment, whereas only a partial purification was achieved for the B920 complexes.
Publication Year: 1986
Publication Date: 1986-07-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 47
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