Chloroplast-encoded small subunits of the three multiprotein complexes in photosynthetic electron transport |
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Authors: | Yuichiro Takahashi |
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Institution: | (1) Department of Biology, Faculty of Science, Okayama University, 3-1-1 Tsushima-naka, 700 Okayama, Japan |
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Abstract: | The photosystem I, photosystem II, and cytochromeb
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f complexes that are involved in electron transport of oxygenic photosynthesis consist of a number of subunits encoded by either
the chloroplast or nuclear genomes. In addition to the major subunits that carry redox components or photosynthetic pigments,
these complexes contain several to more than ten subunits with molecular masses of less than 10 kDa. Directed mutagenesis
has served as a powerful tool for investigation of the roles of these small subunits in the organization or function of the
complexes. Various chloroplast transformants of the green algaChlamydomonas reinhardtii and mutants of cyanobacteria in which a gene encoding a small subunit was deleted or altered have been constructed. Evidence
has accumulated suggesting that these small subunits function in the assembly, stabilization, or protection from photoinhibition
of the complexes or in the modulation or regulation of electron transport. This article presents an overview of the properties
and functions of the chloroplast-encoded small subunits of the three multiprotein complexes of photosynthetic electron transport
that have been mainly analyzed with chloroplast transformants ofC. reinhardtii and the corresponding cyanobacterial transformants.
Recipient of the Botanical Society Award for Young Scientists, 1995. |
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Keywords: | Chloroplast transformant Cytochromeb 6 f Photosynthesis Photosystem I Photosystem II Small subunits |
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