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rRNA endonuclease is an enzyme that catalyses the hydrolysis of the phosphodiester linkage between guanosine and adenosine residues at one specific position in the 28S rRNA of rat ribosomes. This enzyme also acts on bacterial rRNA.
A ribosome-inactivating protein produced by the mold Aspergillus giganteus, alpha-sarcin cleaves the portion of ribosomal RNA that forms the small ribosomal substrate. The high specificity of alpha-sarcin and its efficiency of cleavage are point of study and also account for this protein's very high toxicity level.
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