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. 1986 Dec 15;240(3):709–715. doi: 10.1042/bj2400709

Synthesis of the small subunit of ribulose-bisphosphate carboxylase from genes cloned into plasmids containing the SP6 promoter.

S Anderson, S M Smith
PMCID: PMC1147477  PMID: 3827863

Abstract

DNA sequences encoding ribulose 1,5-bisphosphate carboxylase small subunit precursor from Pisum sativum L. have been transcribed from plasmids containing the SP6 promoter, and translated in a wheat germ cell-free system. The small subunit precursor polypeptide, its N-terminal leader sequence (transit peptide) and the mature small subunit have each been synthesized independently from three different plasmid constructs. The precursor polypeptide is imported into isolated pea chloroplasts and processed to the mature small subunit by a stromal proteinase. The mature polypeptide is neither imported, nor subject to proteolysis by stromal extracts. The transit peptide alone is very rapidly degraded by a stromal proteinase activity which can be inhibited by EDTA or 1,10-phenanthroline. The use of these gene constructs helps to establish the crucial role of the transit peptide in protein import into the chloroplast.

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Selected References

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