Abstract
The B1020 antenna pigment—protein complex of Rhodopseudomonas viridis was isolated and found to contain two polypeptide subunits of apparent M r 8000 and 12000. Near-neighbour relationships between both antenna 8-kDa and 12-kDa polypeptides were revealed by reversible chemical cross-linking. Cross-linked homooligomers, probably up to the respective hexamer, were observed. Subunit M of the photochemical reaction center (RC) and the membrane-bound cytochrome c-553/558 were cross-linked in high yield at a 1:1 stoichiometry. The heavy subunit H of the RC was cross-linked to the 8-kDa polypeptide.
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