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Related Experiment Videos

One RNA polymerase serving two genomes.

B Hedtke1, T Börner, A Weihe

  • 1Institut für Biologie, Abteilung Genetik, Humboldt-Universität zu Berlin, Germany.

EMBO Reports
|March 22, 2001
PubMed
Summary

Arabidopsis thaliana has three RNA polymerases. RpoT;2 is unique, with a transit peptide targeting it to both mitochondria and chloroplasts, transcribing genes in two genomes.

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Area of Science:

  • Plant molecular biology
  • Organelle gene expression
  • RNA polymerase function

Background:

  • Arabidopsis thaliana possesses three nuclear genes (RpoT;1, RpoT;2, RpoT;3) encoding phage-type RNA polymerases.
  • RpoT;1 and RpoT;3 gene products are localized to mitochondria and chloroplasts, respectively.
  • The specific localization and function of RpoT;2 remain to be fully elucidated.

Purpose of the Study:

  • To investigate the targeting properties of the RpoT;2 transit peptide.
  • To determine if RpoT;2 can function in multiple organelles.
  • To characterize the enzymatic activity of RpoT;2.

Main Methods:

  • Transient expression assays in tobacco protoplasts.
  • Stable transformation of Arabidopsis plants.
  • Construction of fusion proteins (RpoT;2 N-terminus with GFP).
  • Assessment of RNA polymerase activity and inhibitor sensitivity.

Main Results:

  • The RpoT;2 transit peptide exhibits dual targeting capabilities.
  • Fusion proteins were efficiently targeted to both mitochondria and chloroplasts.
  • Recombinant RpoT;2 demonstrated RNA polymerase activity unaffected by tagetin.
  • RpoT;2 is confirmed as a phage-type RNA polymerase.

Conclusions:

  • RpoT;2 is the first identified RNA polymerase capable of transcribing genes in two distinct organelle genomes.
  • The dual targeting ability of RpoT;2 has significant implications for understanding gene expression in plant organelles.
  • RpoT;2 represents a novel class of phage-type RNA polymerases with dual organelle localization.

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