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• W2321827298 abstract "The unspecific proteinase K and the specific proteases alpha-chymotrypsin, trypsin and S. aureus V 8 protease were used in order to determine the orientation of the polypeptides B 870-alpha and B 870-beta from the major antenna complex B 870 of Rs. rubrum G-9+ within the chromatophore membrane (inside-out vesicle). Although B 870-alpha exhibits cleavable peptide bonds, treatment with specific proteases yielded splitting only in B 870-beta within the N-terminal region. In the case of proteinase K, which was most effective, mainly 6 (B 870-alpha) and 16 (B 870-beta) amino acid residues were removed from their N-terminal parts as proved by means of Edman degradation of cleavage products. The major peptide bonds cleaved were identified as Gln6-Leu7 in B 870-alpha and as Lys16-Glu17 in B 870-beta. The central hydrophobic stretch regions and the relatively hydrophilic C-terminal parts of both light-harvesting polypeptides were not affected by proteinase K. On the basis of these degradation experiments a transmembrane orientation of B 870-alpha and B 870-beta is postulated, with their N-terminal towards the cytoplasm and their C-termini towards periplasm with regard to the photosynthetic membrane. This hypothesis is supported by the transmembrane model proposed by Brunisholz et al. (Hoppe-Seyler's Z., Physiol. Chem., (1984) 365, 675-688) in which the hydrophobic stretch of B 870-alpha and of B 870-beta forming an alpha-helix would span the membrane once. Organic solvent extraction of chromatophores treated with proteinase K yielded a fairly pure polypeptide fragment with an apparent molecular mass of 14000 Da. Its N-terminal amino-acid sequence is identical with the sequence within the N-terminal region of the reaction centre subunit L of Rs. rubrum G-9+. Thus it is most likely that as in the case of B 870-beta, proteinase K removed 16 amino acid residues from the N-terminal part of subunit L. This subunit therefore also seems to be exposed at the surface of the cytoplasmic side of the chromatophore membrane." @default.
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• W2321827298 date "1984-01-01" @default.
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• W2321827298 title "The Light-Harvesting Polypeptides of<i>Rhodospirillum rubrum.</i>II. Localisation of the Amino-Terminal Regions of the Light-Harvesting Polypeptides B 870-α and B 870-β and the Reaction-Centre Subunit L at the Cytoplasmic Side of the Photosynthetic Membrane of<i>Rhodospirillum rubrum</i>G-9^<b>+</b>" @default.
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• W2321827298 doi "https://doi.org/10.1515/bchm2.1984.365.2.689" @default.
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