Structural order in chromatophore membranes of Rhodospirillum rubrum

Abstract

STRUCTURAL studies of the purple membranes of Halobacterium halobium1–4 have raised the question of whether the in-plane structural order is an exceptional feature of very limited biomembranes or whether it is somewhat more common. We have found that the structural order exists in the chromatophores of Rhodospirillum rubrum and Rhodopseudomonas spheroides and the outer membranes of Salmonella typhimurium, although extension of the order is limited compared with purple membranes. The present paper reports our results concerning the chromatophores of R. rubrum.

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