CHANGES IN LIPID-COMPOSITION OF PHOTOSYSTEM-1 PARTICLES FROM THYLAKOIDS PHOSPHORYLATED UNDER REDUCTIVE OR ANAEROBIC CONDITIONS

Changes in lipid composition of Photosystem 1 (PS 1) particles isolate d from thylakoids phosphorylated under reductive or anaerobic conditio ns have been studied. Under reductive conditions, there was an increas e in monogalactosyldiacylglycerol containing highly saturated fatty ac ids and phosphatidylglycerol containing transhexadecenoic fatty acid. Under anaerobic conditions, the amount of all lipid classes was increa sed. As we have shown earlier (S.V. Manuilskaya, O. I. Volovik, A. I. Mikhno, A. I. Polischuk and S. M. Kochubey (1990) Photosynthetica 24: 419-423) these changes were due to a co-migration of some lipid specie s and light-harvesting chlorophyll a/b complex LHC II from PS 2 to PS 1. These data allow us to conclude that LHC II consists of the lipopro teins containing specific lipids. Different composition of lipids co-m igrating with LHC II under various conditions of phosphorylation might be caused by the variety of LHC II subpopulations transferred under e ach reductive condition.