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Experiments have been conducted to determine whether mono- and digalactosyldiacylglycerols (MGDG and DGDG) labeled by short term exposure of the green alga Dunaliella salina to exogenous radioactive lauric, myristic, or palmitic acids are preferentially recovered in one or more thylakoid protein complexes separated by electrophoresis on nondenaturing gels. A selective retention of certain lipid classes and molecular species by the major electrophoretically separable fractions, oligomeric form (LHCP-1) and monomeric form (LHCP-3) of hight-harvesting chlorophyll a/b protein complex, and major photosystem I protein complex (CPla), and nonprotein-bound lipids, was indicated. After 5 min of labeling with (3)H-palmitate the specific radioactivities of MGDG and DGDG molecular species recovered from LHCP-3 and CPla were slightly higher and lower, respectively, than specific radioactivities of equivalent molecular species from LHCP-1 and nonprotein-bound lipid. However, the differences were smaller than those which have been observed between whole thylakoids and the more highly labeled chloroplast envelopes from briefly labeled cells.

plant physiology

Galactolipids of Thylakoid Pigment Protein Complexes Separated Electrophoretically from Thylakoids of <i>Dunaliella salina</i> Labeled with Radioactive Fatty Acids

Galactolipids of Thylakoid Pigment Protein Complexes Separated Electrophoretically from Thylakoids of Dunaliella salina Labeled with Radioactive Fatty Acids