Add time:08/30/2019         Source:sciencedirect.com

All purified preparations of the ribosome-inactivating proteins ricin A, phytolaccin (cas 1339-33-9) and Shiga toxin were shown to exhibit ribonuclease activity with 5S or 5.8S rRNA substrates. These toxin species generated reproducible patterns of RNA fragments distinct for each toxin species while multiple preparations of a single toxin species yielded similar RNA fragment patterns. The heat inactivation profile of Shiga toxin was identical for its RNase and protein synthesis inhibitory activities. These data are the first to indicate that the ribosome-inactivating catalytic toxins, in addition to alpha-sarcin, exhibit RNase activity. These results suggest RNase activity may be responsible for ribosome-inactivation catalyzed by ricin, phytolaccin and Shiga toxin proteins.

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