ΔpH and membrane potential in bacterial chromatophores

Interaction of Photophosphorylation and Electron Transport Systems in Bacterial Chromatophores.

Chromatophore fractions isolated from photosynthetic bacteria can catalyze light-dependent phosphorylation of adenosine diphosphate to triphosphate (l-3) and also a variety of lightactivated electron transfer reactions, including photoreduction and photo-oxidation of dyes and pyridine nucleotides (4, 5). Whether or not phosphorylation and such electron transport are independent, can occur simul...

The Reversible Interaction of Sodium Dodecyl Sulfate with Bacterial Chromatophores.

The interaction of detergents with photosynthetic systems was studied early by Emil Smith (l), who pointed out the utility of anionic detergents for dispersing chloroplast material. Smith obtained what appeared to be subunits of the pigment complex, and characterized these components by ultracentrifugation. Subsequently, a number of investigators have studied the enzymatic capabilities of chlor...

Conformational Changes of the Membrane-Bound ATPase of Bacterial Chromatophores Revealed by Fluorescence Changes of Fluorescamine-Labelled Coupling Factors

The solubilized coupling factor (Ft) of Rps. sphaeroides chromatophores was allowed to react with fiuorescamine which led to a fluorescence labelled Ft . After reconstitution with the depleted membranes the fluorescence-labelled Fj was shown to restore photophosphorylation in continuous light in a similar way to the non-labelled Ft . In parallel, a decrease of the fluorescence emission of the l...

Acetyl Choline and Chromatophores.

Cytomatrix in chromatophores

Although intracellular transport is a fascinating and vital function shared by diverse cell systems, our understanding of the processes involved remains incomplete, despite the enormous amount of attention it has received over the past 40 years (46). Recent work on pigment granule transport in chromatophores (e .g ., erythrophores, melanophores, and xanthophores), however, has begun to yield ne...