title: Orthogenomics of photosynthetic organisms: bioinformatic and experimental analysis of chloroplast proteins of endosymbiont origin in Arabidopsis and their counterparts in Synechocystis.
abstract: Chloroplasts are descendents of a cyanobacterial endosymbiont, but many chloroplast protein genes of endosymbiont origin are encoded by the nucleus. The chloroplast-cyanobacteria relationship is a typical target of orthogenomics, an analytical method that focuses on the relationship of orthologous genes. Here, we present results of a pilot study of functional orthogenomics, combining bioinformatic and experimental analyses, to identify nuclear-encoded chloroplast proteins of endosymbiont origin (CPRENDOs). Phylogenetic profiling based on complete clustering of all proteins in 17 organisms, including eight cyanobacteria and two photosynthetic eukaryotes, was used to deduce 65 protein groups that are conserved in all oxygenic autotrophs analyzed but not in non-oxygenic organisms. With the exception of 28 well-characterized protein groups, 56 Arabidopsis proteins and 43 Synechocystis proteins in the 37 conserved homolog groups were analyzed. Green fluorescent protein (GFP) targeting experiments indicated that 54 Arabidopsis proteins were targeted to plastids. Expression of 39 Arabidopsis genes was promoted by light. Among the 40 disruptants of Synechocystis, 22 showed phenotypes related to photosynthesis. Arabidopsis mutants in 21 groups, including those reported previously, showed phenotypes. Characteristics of pulse amplitude modulation fluorescence were markedly different in corresponding mutants of Arabidopsis and Synechocystis in most cases. We conclude that phylogenetic profiling is useful in finding CPRENDOs, but the physiological functions of orthologous genes may be different in chloroplasts and cyanobacteria.
authors.affiliation: Department of Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan.
authors.forename: Masayuki
authors.initials: M
authors.lastname: Ishikawa
authors.forename: Makoto
authors.initials: M
authors.lastname: Fujiwara
authors.forename: Kintake
authors.initials: K
authors.lastname: Sonoike
authors.forename: Naoki
authors.initials: N
authors.lastname: Sato
mesh_terms: D020418:Algal Proteins / Q000235:genetics; D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000235:genetics*; D029681:Arabidopsis Proteins / Q000235:genetics; D002736:Chloroplasts / Q000235:genetics*; D019295:Computational Biology / Q000379:methods; D019143:Evolution, Molecular; D017343:Genes, Plant; D054628:Genome, Chloroplast; D018745:Genome, Plant; D023281:Genomics / Q000379:methods*; D008969:Molecular Sequence Data; D016296:Mutagenesis; D010802:Phylogeny; D018749:RNA, Plant / Q000235:genetics; D016415:Sequence Alignment; D013559:Symbiosis / Q000235:genetics*; D046939:Synechocystis / Q000235:genetics*
chemical_list: D020418:Algal Proteins; D029681:Arabidopsis Proteins; D018749:RNA, Plant