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Plant Cell, Vol. 11, 87-100, January 1999, Copyright © 1999, American Society of Plant Physiologists

A Chromodomain Protein Encoded by the Arabidopsis CAO Gene Is a Plant-Specific Component of the Chloroplast Signal Recognition Particle Pathway That Is Involved in LHCP Targeting

Victor I. Klimyuka, Fabienne Persello-Cartieauxb, Michel Havauxb, Pascale Contard-Davidb, Danja Schuenemannc, Karin Meiherhoffd, Patrice Gouete, Jonathan D. G. Jonesa, Neil E. Hoffmanc, and Laurent Nussaumeb
a Sainsbury Laboratory, John Innes Centre, Colney Lane, Norwich NR4 7UH, United Kingdom
b Département d'Ecophysiologie Végétale et de Microbiologie, Commissariat à l'Energie Atomique/Cadarache, F-13108 St. Paul lez Durance Cedex, France
c Carnegie Institution of Washington, Department of Plant Biology, Stanford University, 260 Panama Street, Stanford, California 94305
d Institut für Entwicklungs und Molekularbiologie der Pflanzen, Heinrich-Heine Universität, Universitätsstrasse 1, D-40225 Düsseldorf, Germany
e Institut de Pharmacologie, Centre National de la Recherche Scientifique/Institut de Pharmacologie et de Biologie Structurale, 29 rue Jeanne Marvig, 31055 Toulouse Cedex, France

Correspondence to: Laurent Nussaume, lnussaume{at}cea.fr (E-mail), 33-442-25-4656 (fax)

A recessive mutation in Arabidopsis, named chaos (for chlorophyll a/b binding protein harvesting–organelle specific; designated gene symbol CAO), was isolated by using transposon tagging. Characterization of the phenotype of the chaos mutant revealed a specific reduction of pigment binding antenna proteins in the thylakoid membrane. These nuclear-encoded proteins utilize a chloroplast signal recognition particle (cpSRP) system to reach the thylakoid membrane. Both prokaryotes and eukaryotes possess a cytoplasmic SRP containing a 54-kD protein (SRP54) and an RNA. In chloroplasts, the homolog of SRP54 was found to bind a 43-kD protein (cpSRP43) rather than to an RNA. We cloned the CAO gene, which encodes a protein identified as Arabidopsis cpSRP43. The product of the CAO gene does not resemble any protein in the databases, although it contains motifs that are known to mediate protein–protein interactions. These motifs include ankyrin repeats and chromodomains. Therefore, CAO encodes an SRP component that is unique to plants. Surprisingly, the phenotype of the cpSRP43 mutant (i.e., chaos) differs from that of the Arabidopsis cpSRP54 mutant, suggesting that the functions of the two proteins do not strictly overlap. This difference also suggests that the function of cpSRP43 is most likely restricted to protein targeting into the thylakoid membrane, whereas cpSRP54 may be involved in an additional process(es), such as chloroplast biogenesis, perhaps through chloroplast–ribosomal association with chloroplast ribosomes.




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