Abstract
Purified chloroplasts from developing leaves of Vicia faba L. were broken and separated into stroma and thylakoid fractions. Both fractions contained polysomes as demonstrated by analytical density gradient centrifugation and in-vitro read-out translation. Messenger RNAs of free and thylakoid-bound polysomes were isolated and analysed by hybridization with heterologous gene probes from spinach and tobacco. Transcripts of the chloroplast genes psaA, psbB, psbC, psbD and petA were found predominantly on thylakoidbound polysomes engaged in the synthesis and the contrasslational integration of membrane proteins. In contrast, transcripts of the genes rbcL, psbE, petD, atpA, atpB, atpE and atpH were found more frequently on free polysomes corresponding to a stroma-located translation of these mRNAs and a posttranslational integration of the encoded intrinsic membrane proteins. We conclude from these findings that chloroplast-encoded membrane proteins are integrated by co-and posttranslational mechanisms.
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Abbreviations
- kb:
-
kilobase
- kDa:
-
kilodalton
- PSI,II:
-
photosystem I, II
- cpRNA:
-
total chloroplast RNA
- stRNA:
-
total chloroplast stromal RNA
- stpRNA:
-
chloroplast stromal RNA from free polysomes
- the RNA:
-
RNA electrostatically bound to thylakoids
- thpRNA:
-
RNA of polysomes bound to thylakoids via nascent polypeptide chains
- RuBPCase:
-
ribulose-1,5-bisphosphate carboxylase
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Friemann, A., Hachtel, W. Chloroplast messenger RNAs of free and thylakoid-bound polysomes from Vicia faba L. Planta 175, 50–59 (1988). https://doi.org/10.1007/BF00402881
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DOI: https://doi.org/10.1007/BF00402881