Molecular and General Genetics MGG

, Volume 234, Issue 3, pp 390–400

Multiple plant RNA binding proteins identified by PCR: expression of cDNAs encoding RNA binding proteins targeted to chloroplasts in Nicotiana plumbaginifolia

Authors

  • Maja Mieszczak
    • Friedrich Miescher-Institut
  • Ulrich Klahre
    • Friedrich Miescher-Institut
  • Jonathan H. Levy
    • Friedrich Miescher-Institut
  • Gregory J. Goodall
    • Friedrich Miescher-Institut
  • Witold Filipowicz
    • Friedrich Miescher-Institut
Article

DOI: 10.1007/BF00538698

Cite this article as:
Mieszczak, M., Klahre, U., Levy, J.H. et al. Molec. Gen. Genet. (1992) 234: 390. doi:10.1007/BF00538698

Summary

Pre-mRNA processing in eukaryotic cells requires the participation of multiple protein factors and ribonucleoprotein particles. One class of proteins involved in this process are RNA-binding proteins, which contain a domain of ca. 90 amino acids with a characteristic ribonucleoprotein consensus sequence (RNP-CS). A PCR approach that is suitable for the characterization of RNP-CS-type proteins is described. Fifteen different RNA-binding domains were amplified from Nicotiana tabacum (tobacco) using oligonucleotide primers specific for the sequences (K/R)G(F/Y)(G/A)FVX(F/Y) and (L/I/V)(F/Y)(V/I)(G/K)(N/G)L, which are conserved in known RNP-CS proteins. Using the tobacco domains as probes, cDNAs encoding two RNA-binding proteins, each containing two RNP-CS-type domains, were characterized in N. plumbaginifolia. The proteins, designated CP-RBP30 and CP-RBP31, are targeted to chloroplasts as demonstrated by expression of epitope-tagged cDNAs in transfected protoplasts, followed by indirect immunofluorescence. High levels of mRNA for each protein were found in leaves but not in roots, and expression of the CP-RBP31 mRNA was strongly regulated by light. The N. plumbaginifolia proteins described in this work are distinct from chloroplast RNA-binding proteins characterized recently in tobacco and spinach.

Key words

Immunofluorescence Polymerase chain reaction Protein sorting Protein/RNA interactions Protoplast transfection

Copyright information

© Springer-Verlag 1992