Synthesis and assembly of the cytochrome b-f complex in higher plants

The cytochrome b-f complex is composed of four polypeptide subunits, three of which, cytochrome f, cytochrome b-563 and subunit IV, are encoded in chloroplast DNA and synthesised within the chloroplast, and the fourth, the Rieske FeS protein, is encoded in nuclear DNA and synthesised in the cytoplas...

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Published in:Photosynthesis research 1988-07, Vol.17 (1-2), p.125-144
Main Authors: WILLEY, D. L, GRAY, J. C
Format: Article
Language:English
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Biological and medical sciences
Cell structures and functions
Chloroplast, photosynthetic membrane and photosynthesis
Fundamental and applied biological sciences. Psychology
Molecular and cellular biology
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description The cytochrome b-f complex is composed of four polypeptide subunits, three of which, cytochrome f, cytochrome b-563 and subunit IV, are encoded in chloroplast DNA and synthesised within the chloroplast, and the fourth, the Rieske FeS protein, is encoded in nuclear DNA and synthesised in the cytoplasm. The assembly of the cytochrome b-f complex therefore requires the interaction of subunits encoded by different genomes. A key role for the nuclear-encoded Rieske FeS protein in the assembly of the complex is suggested by a study of cytochrome b-f complex mutants. The assembly of individual subunits of the complex may be regulated by the availability of prosthetic groups. The genes for the chloroplast-encoded subunits and cDNA clones for the Rieske FeS protein have been isolated and characterised. Cytochrome f and the Rieske FeS protein are synthesised initially with N-terminal presequences required for their correct assembly within the chloroplast. The deduced amino acid sequences of the four subunits have been used to suggest models for the arrangement of the polypeptides in the thylakoid membrane.
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source Springer Online Journal Archives (Through 1996)
subjects Biological and medical sciences
Cell structures and functions
Chloroplast, photosynthetic membrane and photosynthesis
Fundamental and applied biological sciences. Psychology
Molecular and cellular biology
title Synthesis and assembly of the cytochrome b-f complex in higher plants
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