| Abstract: | 1. 1. The structure of intracytoplasmic membranes of a photosynthetic bacterium Chromatium vinosum and a nitrogen-fixing bacterium Azotobacter vinelandii was studied by chemical modification of amino groups of phospatidylethanolamine and proteins with trinitrobenzensulfonate. 2. 2. Almost all the constituents of intracytoplasmic membranes of C. vinosum were solubilized in a mixture of chloroform, methanol and trichloroacetic acid. One-third of proteins in the intracytoplasmic membranes of C. vinosum was found solubilized in a mixture of chloroform and methanol. By using a column chromatography with Sephadex LH-20 in organic solvents, the unmodified as well as the trinitrophenylated proteins and also the trinitrophenylated phosphatidylethanolamine were separated from the other colored substances. 3. 3. In the chemical modification of the intracytoplasmic membrane preparations, 30% of phosphatidylethanolamine and 15% of protein amino groups in C. vinosum and 45% of phosphatidylethanolamine and 20% of protein amino groups in A. vinelandii were estimated to be exposed to the aqueous phase. In the single-layered liposomes composed of phosphatidylethanolamine and phospatidylglycerol with a ratio of 2:1, 40% of phosphatidylethanolamine were estimated to be exposed to the aqueous phase.
Abbreviations: N3Ph, trinitrophenylated |
