Abstract
The cyclic electron transfer system in purple bacteria is composed of the photosynthetic reaction center, the cytochromebc 1 complex, cytochromec 2, and ubiquinone. These components share many characteristics with those of photosynthesis and respiration in other organisms. Studies of the cyclic electron transfer system have provided useful insights about the evolution and general mechanisms of membranous energy-conserving systems. The photosynthetic system in purple bacteria may represent a prototype of highly efficient, energy-conserving electron transfer systems in the organisms.
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