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MBE Advance Access originally published online on September 8, 2004
Molecular Biology and Evolution 2005 22(1):21-28; doi:10.1093/molbev/msh250
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Molecular Biology and Evolution vol. 22 no. 1 © Society for Molecular Biology and Evolution 2005; all rights reserved.

Research Article

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

Min Chen*, Roger G. Hiller{dagger}, Christopher J. Howe{ddagger} and Anthony W. D. Larkum*

* School of Biological Sciences, University of Sydney, Australia and Sydney University Biological Informatics and Technology Centre (SUBIT), University of Sydney, NSW, Australia; {dagger} Department of Biology, Macquarie University, NSW, Australia; and {ddagger} Department of Biochemistry, University of Cambridge, Cambridge, United Kingdom

E-mail: alark{at}mail.usyd.edu.au.

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–containing or Chl d–containing organisms. This may indicate widespread lateral transfer of the Pcb protein–based light-harvesting system.

Key Words: prochlorophyte chlorophyll a/b protein • Acaryochloris marina • Prochloron didemni • lateral genes transfer • chlorophyll-d • light-harvesting protein complexes


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