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The transverse orientation of photosynthetic polypeptides in the membrane of Rhodopseudomonas capsulata was investigated using surface radioiodination of chromatophores and spheroplasts with the reagent 1,3,4,6‐tetrachloro‐3α, 6α‐diphenylglycoluril. Native pigment‐protein complexes were isolated by Triton X‐100‐polyacrylamide gel electrophoresis to identify and distinguish polypeptides not separated by sodium dodecylsulphate‐polyacrylamide gel electrophoresis. The two antenna light‐harvesting complexes were found to be asymmetrically oriented with polypeptides 14 kDa and 8 kDa of complex B800‐850 and 12 kDa of B870 being exposed on either membrane surface. Subunits H and M of the photochemical reaction centre, and probably L, span the membrane.
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Peters et al. (1983) studied this question.
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