title: CLB19, a pentatricopeptide repeat protein required for editing of rpoA and clpP chloroplast transcripts.
abstract: RNA editing changes the sequence of many transcripts in plant organelles, but little is known about the molecular mechanisms determining the specificity of the process. In this study, we have characterized CLB19 (also known as PDE247), a gene that is required for editing of two distinct chloroplast transcripts, rpoA and clpP. Loss-of-function clb19 mutants present a yellow phenotype with impaired chloroplast development and early seedling lethality under greenhouse conditions. Transcript patterns are profoundly affected in the mutant plants, with a pattern entirely consistent with a defect in activity of the plastid-encoded RNA polymerase. CLB19 encodes a pentatricopeptide repeat protein similar to the editing specificity factors CRR4 and CRR21, but, unlike them, is implicated in editing of two target sites.
authors.affiliation: ARC Centre of Excellence in Plant Energy Biology, Molecular and Chemical Sciences Building (M316), University of Western Australia, 35 Stirling Highway, Crawley, Perth, 6009 WA, Australia.
authors.forename: Anne-Laure
authors.initials: AL
authors.lastname: Chateigner-Boutin
authors.forename: Maricela
authors.initials: M
authors.lastname: Ramos-Vega
authors.forename: Arturo
authors.initials: A
authors.lastname: Guevara-García
authors.forename: Charles
authors.initials: C
authors.lastname: Andrés
authors.forename: María
authors.initials: M
authors.lastname: de la Luz Gutiérrez-Nava
authors.forename: Araceli
authors.initials: A
authors.lastname: Cantero
authors.forename: Etienne
authors.initials: E
authors.lastname: Delannoy
authors.forename: Luis Felipe
authors.initials: LF
authors.lastname: Jiménez
authors.forename: Claire
authors.initials: C
authors.lastname: Lurin
authors.forename: Ian
authors.initials: I
authors.lastname: Small
authors.forename: Patricia
authors.initials: P
authors.lastname: León
mesh_terms: D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000235:genetics* / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D002736:Chloroplasts / Q000235:genetics*; D004269:DNA, Bacterial / Q000235:genetics; D018506:Gene Expression Regulation, Plant; D005816:Genetic Complementation Test; D008969:Molecular Sequence Data; D016254:Mutagenesis, Insertional; D009154:Mutation; D010641:Phenotype; D017393:RNA Editing; D018747:RNA, Chloroplast / Q000378:metabolism*; D018749:RNA, Plant / Q000378:metabolism; D016601:RNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*
chemical_list: D029681:Arabidopsis Proteins; C000603135:CLB19 protein, Arabidopsis; D004269:DNA, Bacterial; D018747:RNA, Chloroplast; D018749:RNA, Plant; D016601:RNA-Binding Proteins; C036483:T-DNA