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Spectral and kinetic evidence for 2 early electron acceptors in photosystem i

, : Spectral and kinetic evidence for 2 early electron acceptors in photosystem i. Proceedings of the National Academy of Sciences of the United States of America 76(2): 770-773

Triton-fractionated photosystem-I particles poised at -625 mV, where the 2 bound Fe-S proteins are reduced, were studied by optical and EPR spectroscopies from K. At K, these particles exhibit 2 decay components with lifetimes of 1.3 and 130 ms in the laser pulse-induced absorption and EPR signal changes. Spectral properties of the 130 ms decay component reflect the charge separation between P-700 and some Fe-S center having a broad optical absorbance in the 400-550 nm region and a previously reported EPR signal with g = 1.78, 1.88 and 2.08. Spectral properties of the 1-msec decay component indicate photoinduced charge separation between P-700 and a chlorophyll a dimer having absorption bands at 420, 450 and 700 nm. It is assumed that these 2 acceptors participate in the electron transfer from P-700* to the bound Fe-S proteins.

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