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The 38 kDa chlorophyll a/b protein of the prokaryote Prochlorothrix hollandica is encoded by a divergent pcb gene

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Abstract

The chlorophyll (Chl) a/b proteins of the photosynthetic prokaryotes appear to have evolved by gene duplication and divergence of the core Chl a antenna family, which also includes CP43 and CP47 and the iron-stress induced Chl a-binding IsiA proteins. We show here that Prochlorothrix hollandica has a cluster of three pcb (prochlorophyte chlorophyll b) genes which are co-transcribed. The major antenna polypeptides of 32 and 38 kDa are encoded by pcbA and pcbC respectively. The pcbC gene is significantly divergent from the other two and may have originated by a gene duplication independent of the one that led to isiA and the other prochlorophyte pcb genes. The distant relatedness of the three prochlorophyte genera implies that not only the ability to make Chl b and use it for light-harvesting arose independently in the three lineages, but also that the pcb genes may have arisen as the result of independent gene duplications in each lineage.

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Author notes

  1. Georg W. M. van der Staay

    Present address: Station Biologique (UPMC-CNRS-INSU), BP74, 29682, Roscoff Cedex, France

Authors and Affiliations

  1. Botany Dept., University of British Columbia, Vancouver, B.C., Canada, V6T 1Z4

    Georg W. M. van der Staay, Natalya Yurkova & Beverley R. Green

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  1. Georg W. M. van der Staay
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  2. Natalya Yurkova
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  3. Beverley R. Green
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van der Staay, G.W.M., Yurkova, N. & Green, B.R. The 38 kDa chlorophyll a/b protein of the prokaryote Prochlorothrix hollandica is encoded by a divergent pcb gene. Plant Mol Biol 36, 709–716 (1998). https://doi.org/10.1023/A:1005930210515

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