Journal of Molecular Evolution

, Volume 48, Issue 1, pp 59–68

A Phylogenetic Assessment of the Eukaryotic Light-Harvesting Antenna Proteins, with Implications for Plastid Evolution

  • D.G.  Durnford
  • J.A.  Deane
  • S.  Tan
  • G.I.  McFadden
  • E.  Gantt
  • B.R.  Green

DOI: 10.1007/PL00006445

Cite this article as:
Durnford, D., Deane, J., Tan, S. et al. J Mol Evol (1999) 48: 59. doi:10.1007/PL00006445

Abstract.

The light-harvesting complexes (LHCs) are a superfamily of chlorophyll-binding proteins present in all photosynthetic eukaryotes. The Lhc genes are nuclear-encoded, yet the pigment–protein complexes are localized to the thylakoid membrane and provide a marker to follow the evolutionary paths of plastids with different pigmentation. The LHCs are divided into the chlorophyll a/b-binding proteins of the green algae, euglenoids, and higher plants and the chlorophyll a/c-binding proteins of various algal taxa. This work examines the phylogenetic position of the LHCs from three additional taxa: the rhodophytes, the cryptophytes, and the chlorarachniophytes. Phylogenetic analysis of the LHC sequences provides strong statistical support for the clustering of the rhodophyte and cryptomonad LHC sequences within the chlorophyll a/c-binding protein lineage, which includes the fucoxanthin–chlorophyll proteins (FCP) of the heterokonts and the intrinsic peridinin–chlorophyll proteins (iPCP) of the dinoflagellates. These associations suggest that plastids from the heterokonts, haptophytes, cryptomonads, and the dinoflagellate, Amphidinium, evolved from a red algal-like ancestor. The Chlorarachnion LHC is part of the chlorophyll a/b-binding protein assemblage, consistent with pigmentation, providing further evidence that its plastid evolved from a green algal secondary endosymbiosis. The Chlorarachnion LHC sequences cluster with the green algal LHCs that are predominantly associated with photosystem II (LHCII). This suggests that the green algal endosymbiont that evolved into the Chlorarachnion plastid was acquired following the emergence of distinct LHCI and LHCII complexes.

Key words: Light-harvesting complexes — Plastid evolution — Rhodophytes — Cryptomonads —Chlorarachnion 

Copyright information

© Springer-Verlag New York Inc. 1999

Authors and Affiliations

  • D.G.  Durnford
    • 1
  • J.A.  Deane
    • 2
  • S.  Tan
    • 3
  • G.I.  McFadden
    • 2
  • E.  Gantt
    • 3
  • B.R.  Green
    • 4
  1. 1.Department of Biology, University of New Brunswick, Mail Service #45111, Fredericton, New Brunswick E3B 6E1, CanadaCA
  2. 2.Plant Cell Biology Research Centre, School of Botany, University of Melbourne, Parkville, 3052 VIC, AustraliaAU
  3. 3.Department of Microbiology, University of Maryland, College Park, MD 20742, USAUS
  4. 4.Department of Botany, University of British Columbia, Vancouver, British Columbia V6T 1Z4, CanadaCA

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