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MBE Advance Access published online on September 8, 2004
Molecular Biology and Evolution, doi:10.1093/molbev/msh250
Molecular Biology and Evolution © Society for Molecular Biology and Evolution 2004; all rights reserved
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Accepted August 30, 2004

Research Article

Unique Origin and Lateral Transfer of Prokaryotic Chlorophyll-b and Chlorophyll-d Light-harvesting Systems

Min Chen 1, Roger G. Hiller 2, Christopher J. Howe 3, and Anthony W.D. Larkum 1*

1 School of Biological Sciences (A08), University of Sydney, NSW 2006, Australia and Sydney University Biological Informatics and Technology Centre (SUBIT), University of Sydney, NSW 2006, Australia
2 Dept of Biology, Macquarie University, NSW 2109, Australia
3 Department of Biochemistry, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QW, United Kingdom

* To whom correspondence should be addressed. E-mail: alark{at}mail.usyd.edu.au.


  Abstract

Pcb genes, encoding proteins binding light-harvesting chlorophylls, were cloned and sequenced from the Chl d-containing cyanobacterium, Acaryochloris marina and the Chl b-containing cyanobacterium Prochloron didemni. Both organisms contained two tandem pcb genes. Peptide fingerprinting confirmed the expression of one of the A. marina pcb genes. Phylogenetic tree reconstruction using distance matrix and maximum likelihood methods indicated a single origin of the pcb gene family, whether occurring in Chl b- or Chl d-containing organisms. This may indicate widespread lateral transfer of the Pcb-based light-harvesting system.

Keywords: prochlorophyte chlorophyll a/b protein (Pcb); Acaryochloris marina; Prochloron didemni; lateral genes transfer; chlorophyll d; Light-harvesting protein complexes.
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