Abstract
A model molecular complex of chlorophyll a and FMN is found to have properties resembling the P700 of photosynthesis. The model complex shows an absorption maximum near 700 nm which can be bleached reversibly by light. ESR studies show that the photobleaching is accompanied by light-driven electron transfer from the chlorophyll a to the flavin. These observations are consistent with the previous suggestion that P700 may be a molecular complex of chlorophyll a and the prosthetic group (FAD) of chloroplast NADP +-reductase.
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