[Study of the effect of specific translation inhibitors on formation of native forms of chlorophyll in pigment-protein-lipid complexes of pea chloroplasts].

The effect of specific inhibitors of translation in chloroplasts (chloramphenicol) and in cytoplasm (cycloheximide) on the formation of pigment-protein-lipid complexes of photosynthetic membranes, on the chlorophyll state in chloroplasts and isolated membrane complexes had been studied. It is proved that the inhibition of translation blocks chlorophyll incorporation only into the complexes of reaction centres of photosystems without any change of the light-harvesting complex. The action of inhibitors leads to the disappearance of long-wave native forms of pigment in the complexes of reaction centres, which are characteristic for them. But the action of inhibitors does not effect the formation of non-specific short-wave forms which are present in all types of membrane complexes. Chloramphenicol proved to be more active in such processes than cycloheximide. On the basis of the data on localization of biosynthesis of polypeptide components of plastid membranes we suppose that during biogenesis of the photosynthetic apparatus the conditions for self-assembly of non-specific native forms of chlorophyll in light-harvesting complexes are made as the result of polymerazation of the main membrane polypeptides which are synthesized in the cytoplasms. Minor polypeptides of plastid (photosystems 1 and 2) and cytoplasmic (photosystem 1) orgin are necessary for self-assembly of the dense units of pigment in reaction centre complexes.