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The apoprotein precursor of the major light-harvesting complex of photosystem II (LHCIIb) is inserted primarily into stromal lamellae and subsequently migrates to the grana

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Abstract

The formation of the lateral distribution of the major antenna complex of photosystem II (LHCIIb) between the granal and stromal lamellae was studied. Specifically, the localization of the insertion and the assembly of the precursor of the apoprotein of LHCIIb (pLHCP) were studied with isolated thylakoids. After insertion of pLHCP into isolated thylakoids, fractionation of the latter into granal and stromal lamellar was performed. At 25 °C most of the precursor was located in the granal lamellae, although both highly purified granal and stromal lamellar fractions demonstrated a similar capability to insert pLHCP. When the insertion reaction to the thylakoids was performed at 10 °C, followed by their separation into stromal and granal lamellae, the labelled pLHCP was localized in the stromal ones. To examine whether pLHCP inserts into both granal and stromal lamellae, or preferentially into stromal lamellae and subsequently migrating to granal lamellae, a chase experiment was performed. Insertion of pLHCP at 10 °C was followed by chase of the radioactive precursor with excess of non-radioactive pLHCP at 25 °C. From the results presented it is evident that the level of pLHCP in stromal lamellae was gradually reduced, while it gradually accumulated in the granal lamellae. Furthermore, the pLHCP in the stromal lamellae was found to be in a ‘free’ form, while after migrating to the granal lamellae it assembled into the pigmented LHCIIb.

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Authors and Affiliations

  1. Department of Botany, The Hebrew University of Jerusalem, 91904, Jerusalem, Israel

    Shaul Yalovsky, Gadi Schuster & Rachel Nechushtai

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  1. Shaul Yalovsky
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  2. Gadi Schuster
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  3. Rachel Nechushtai
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Yalovsky, S., Schuster, G. & Nechushtai, R. The apoprotein precursor of the major light-harvesting complex of photosystem II (LHCIIb) is inserted primarily into stromal lamellae and subsequently migrates to the grana. Plant Mol Biol 14, 753–764 (1990). https://doi.org/10.1007/BF00016508

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  • DOI: https://doi.org/10.1007/BF00016508

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