Ribosome-inactivating proteins (RNA N-glycosidases) from the seeds of Saponaria ocymoides and Vaccaria pyramidata

A. Bolognesi, F. Olivieri, M. G. Battelli, L. Barbieri, A. I. Falasca, A. Parente, F. Del Vecchio Blanco, F. Stirpe

Research output: Contribution to journalArticlepeer-review


From the seeds of the Caryophyllaceae Saponaria ocymoides and Vaccaria pyramidata two proteins were purified which have the properties of the type-1 (single-chain) ribosome-inactivating proteins [reviewed by Barbieri, L., Battelli, M.G. and Stirpe, F. (1993) Ribosome-inactivating proteins from plants, Biochim. Biophys. Acta 1154, 237-282]. The proteins have molecular masses of 30.2 kDa (S. ocymoides) and 28.0 kDa (V. pyramidata) and pI greater than 9.5, their N-terminal amino acid sequences are similar to those of saporin-S6 and dianthin 30, ribosome-inactivating proteins from other Caryophyllaceae, and they partially cross-react with sera against these proteins. Both proteins inhibit protein synthesis by a rabbit-reticulocyte lysate with IC50 (concentrations giving 50% inhibition) below 10-10 M, have a smaller effect on poly(U)-directed phenylalanine polymerisation by rat liver ribosomes (nanomolar IC50, approximately) and on protein synthesis by various cell lines (IC50 ranging from 4 nM to > 3000 nM) and possess rRNA N-glycosidase activity, releasing 1 mol adenine/ribosome.

Original languageEnglish
Pages (from-to)935-940
Number of pages6
JournalEuropean Journal of Biochemistry
Issue number3
Publication statusPublished - 1995


  • protein synthesis
  • ribosome-inactivating protein
  • RNA-N-glycosidase

ASJC Scopus subject areas

  • Biochemistry


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