Chromatophores isolated from photosynthetic bacteria contain a disulfide-bonded repeating antigenic substructure that is serologically specific and present on the cell particles only during photosynthetic growth (l-3). This finding suggests that the structural antigen may also be a functional part of the photosynthetic electron transport system. This suggestion has been explored and supported b...

Ribulose 1,5-diphosphate carboxylase has been isolated from autotrophically cultured Rhoclospirillum rubrum. The molecular weight is 120,000. The K, for ribulose 1,5diphosphate is 83 mM, and for CO2 is 59 mM. The enzyme is inhibited by three important metabolites: citrate, an intermediate of the tricarboxylic acid cycle; inorganic phosphate; and 3-phosphoglyceric acid, the product of the reacti...

In the previous paper of this series (l), some characteristics of the photoreducing system of Rhodospirillum rubrum chromatophores were presented. In one of the experiments described, it appeared that methylene blue was being oxidized in the illuminated reaction mixture. Since such a photooxidation would be an expression of the photooxidizing system of the chromatophore, this reaction was inves...

Trying to detect the genes coding for light harvesting II polypeptides of the purple bacteria Ectothiorhodospira sp. a gene corresponding to a light harvesting I polypeptide was cloned. This paper discusses the probable reasons of this result. The sequence of this polypeptide underlines the strong similarity with light harvesting complexes from bacteria such as Rhodospirillum molischianum and C...

In coupling the reducing power of illuminated chloroplasts to the nitrogenase from photosynthetically grown Rhodospirillum rubrum cells, one of the native ferredoxins. FdI, was found to be three times more effective than FdII.

A novel hopanoid bearing a glucuronopyranosyl residue linked via an alpha-glycosidic bond to the hydroxyl group of C-35 in bacteriohopanetetrol was isolated, from the type strain of Rhodospirillum rubrum as well as from a mutant lacking blue carotenoid.

Ribulose 1,5-diphosphate carboxylase has been isolated from autotrophically cultured Rhoclospirillum rubrum. The molecular weight is 120,000. The K, for ribulose 1,5diphosphate is 83 mM, and for CO2 is 59 mM. The enzyme is inhibited by three important metabolites: citrate, an intermediate of the tricarboxylic acid cycle; inorganic phosphate; and 3-phosphoglyceric acid, the product of the reacti...