CLB19, a pentatricopeptide repeat protein required for editing of rpoA and clpP chloroplast transcripts

Plant J. 2008 Nov;56(4):590-602. doi: 10.1111/j.1365-313X.2008.03634.x. Epub 2008 Aug 23.


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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Arabidopsis / genetics*
  • Arabidopsis / metabolism
  • Arabidopsis Proteins / genetics
  • Arabidopsis Proteins / metabolism*
  • Chloroplasts / genetics*
  • DNA, Bacterial / genetics
  • Gene Expression Regulation, Plant
  • Genetic Complementation Test
  • Molecular Sequence Data
  • Mutagenesis, Insertional
  • Mutation
  • Phenotype
  • RNA Editing*
  • RNA, Chloroplast / metabolism*
  • RNA, Plant / metabolism
  • RNA-Binding Proteins / genetics
  • RNA-Binding Proteins / metabolism*


  • Arabidopsis Proteins
  • CLB19 protein, Arabidopsis
  • DNA, Bacterial
  • RNA, Chloroplast
  • RNA, Plant
  • RNA-Binding Proteins
  • T-DNA