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Plastocyanin–ferredoxin oxidoreduction and endosymbiotic gene transfer

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Abstract

Sequence similarities of proteins associated with plastocyanin–ferredoxin oxidoreduction (PcFdOR) activity of Photosystem I (PSI) were grouped and compared. PsaA, psaB, psaC, and petG represent genes that have been retained in the chloroplasts of both green- and red-lineage species. PsaD, psaE, psaF, and petF represent genes that have been retained in the chloroplast of red-lineage species, but have been transferred to the nuclear genome of green-lineage species. Translated sequences from red- and green-lineage proteins were compared to that of contemporary cyanobacteria, Synechocystis PCC 6803, and Gloeobacter violaceus PCC 7421. Within the green lineage, a lower level of sequence conservation coincided with gene transfer to the nuclear genome. Surprisingly, a similar pattern of sequence conservation existed for the same set of genes found in the red lineage even though all those genes were retained in their chloroplast genomes. This discrepancy between green and red lineage is discussed in terms of endosymbiotic gene transfer.

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Abbreviations

LHC-II:

Light-harvesting chlorophyll a/b-binding protein for Photosystem II

PcFdOR:

Plastocyanin–ferredoxin oxidoreduction

psaA:

Gene for Photosystem I, P700 apoprotein subunit Ia (A1)

psaB:

Gene for Photosystem I, P700 apoprotein subunit Ib (A2)

psaC:

Gene for Photosystem I subunit VII

psaD:

Gene for Photosystem I subunit II

psaE:

Gene for Photosystem I subunit IV

psaF:

Gene for Photosystem I subunit IX

petF:

Gene for ferredoxin

petG:

Gene for Cyt b 6 /f subunit; Plastocyanin

PSI:

Photosystem I

PSII:

Photosystem II

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Correspondence to Douglas R. Carter.

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Carter, D.R. Plastocyanin–ferredoxin oxidoreduction and endosymbiotic gene transfer. Photosynth Res 97, 245–253 (2008). https://doi.org/10.1007/s11120-008-9333-y

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  • DOI: https://doi.org/10.1007/s11120-008-9333-y

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