, Volume 56, Issue 1, pp 62–66 | Cite as

Chloroplast ribonucleoprotein-like proteins of the moss Physcomitrella patens are not involved in RNA stability and RNA editing

  • H. Uchiyama
  • M. Ichinose
  • M. Sugita
Brief Communication


Many RNA recognition motif (RRM)-containing proteins are known to exist in chloroplasts. Major members of the RRM protein family, which are chloroplast ribonucleoproteins (cpRNPs), have been investigated in seed plants, including tobacco and Arabidopsis thaliana, but never in early land plants, such as bryophytes. In this study, we surveyed RRM proteins encoded in the moss Physcomitrella patens genome and predicted 25 putative chloroplast RRM proteins. Among them, two RRM-containing proteins, PpRBP2a and PpRBP2b, resembled cpRNPs and were thus referred to as cpRNP-like proteins. However, knockout mutants of either one or two PpRBP2 genes exhibited a wild type-like phenotype. Unlike Arabidopsis cpRNPs, the levels of mRNA accumulation in chloroplasts were not affected in the PpRBP2 knockout mutants. In addition, the efficiency of RNA editing was also not altered in the mutants. This suggests that PpRBP2a and 2b may be functionally distinct from Arabidopsis cpRNPs.

Additional key words

pentatricopeptide repeat protein photosynthesis gene posttranscriptional regulation RNA-binding protein RNA processing 



5-formyltetrahydrofolate cyclo-ligase


chloroplast ribonucleoprotein


green fluorescence protein




heterogeneous nuclear ribonucleoprotein




poly(A)-binding protein


pentatricoepetide repeat


RNA recognition motif


small nuclear ribonucleoprotein


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Supplementary material

11099_2017_755_MOESM1_ESM.pdf (259 kb)
Supplementary Fig. 1. Schematic diagrams showing the domain structure of PpPPR_3 and newly identified chloroplastic RRM proteins.
11099_2017_755_MOESM2_ESM.pdf (1.1 mb)
Supplementary Fig. 2. Confirmation of chloroplast localization of RRM proteins.
11099_2017_755_MOESM3_ESM.pdf (319 kb)
Supplementary Fig. 3. Phenotype of knockout (KO) mutants of RRM protein genes.


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Copyright information

© The Institute of Experimental Botany 2018

Authors and Affiliations

  1. 1.Center for Gene ResearchNagoya UniversityChikusa-ku, NagoyaJapan
  2. 2.Institute of Transformative Bio-MoleculesNagoya UniversityChikusa-ku, NagoyaJapan

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