Plant Physiology Preview
Published on February 16, 2007; 10.1104/pp.106.092536
OPEN ACCESS ARTICLE
Received November 2, 2006
Accepted February 7, 2007
Tracing the Evolution of the Light-Harvesting Antennae in Chlorophyll a/b-Containing Organisms
Adam G. Koziol , Tudor Borza , Ken-Ichiro Ishida , Patrick Keeling , Robert W. Lee , and Dion G. Durnford *
Department of Biology, University of New Brunswick, Fredericton, NB, Canada, E3B 5A3; Department of Biology, Dalhousie University, Halifax, NS, Canada, B3H 4J1; Institute of Biological Sciences, University of Tsukuba, Tsukaba, Ibaraki, 305-8572, Japan; Department of Botany, University of British Columbia, Vancouver, B.C., Canada, V6T 1Z4
* Corresponding author; email: durnford{at}unb.ca.
The Light-harvesting complexes (LHCs) of land plants and green algae have essential roles in light capture and photoprotection. Though the functional diversity of the individual LHC proteins are well described in many land plants, the extent of this family in the majority of green algal groups is unknown. In order to examine the evolution of the chlorophyll a/b antennae system and to infer its ancestral state, we initiated several expressed sequence tag (EST) projects from a taxonomically broad range of chlorophyll a/b-containing protists. This included representatives from the Ulvophyceae (Acetabularia acetabulum), the Mesostigmatophyceae (Mesostigma viride) and the Prasinophyceae (Micromonas sp.), as well as one representative from each of the Euglenozoa (Euglena gracilis) and Chlorarachniophyta (Bigelowiella natans), whose plastids evolved secondarily from green alga. It is clear that the core antenna system was well developed prior to green algal diversification and likely consisted of the CP29 (Lhcb4) and CP26 (Lhcb5) proteins associated with PSII plus a PSI antenna composed of proteins encoded by at least Lhca3 and two green algal-specific proteins encoded by the Lhca2 and 9 genes. In organisms containing secondary plastids, we found no evidence for orthologs to the plant/algal antennae with the exception of CP29 . We also identified PsbS homologs in the Ulvophyceae and the Prasinophyceae, indicating that this distinctive protein appeared prior to green algal diversification. This analysis provides a snapshot of the antenna systems in diverse green algae, and allows us to infer the changing complexity of the antenna system during green algal evolution.
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