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Phototrophs of the family Heliobacteriaceae contain the simplest known Type I reaction center (RC), consisting of a homodimeric (PshA)2 core devoid of bound cytochromes and antenna proteins. Unlike plant and cyanobacterial Photosystem I in which the FA/FB protein, PsaC, is tightly bound to P700–FX cores, the RCs of Heliobacterium modesticaldum contain two FA/FB proteins, PshBI and PshBII, which are...
An electrometrical technique was used to investigate electron transfer between the terminal iron-sulfur centers F A /F B and external electron acceptors in photosystem I (PS I) complexes from the cyanobacterium Synechococcus sp. PCC 6301 and from spinach. The increase of the relative contribution of the slow components of the membrane potential decay kinetics in the presence of both...
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