RNAs can be catalysts {RNA catalyst}.
RNase-P RNA part splits tyrosine-tRNA precursor to make tRNA.
Fungus-mitochondria mRNA and rRNA precursors, and bacteriophage mRNA precursors {Class I self-splicing}, can catalyze themselves to remove introns, using guanosine as cofactor. Introns have further processing to make different RNA catalysts.
Yeast and fungus mitochondria mRNA precursors, and Chlamydomonas chloroplast mRNA precursors {Class II self-splicing}, can catalyze themselves to remove introns, using no cofactors.
Some protozoa edit transcribed RNA to make correct reading frames, possibly using RNA catalysts.
Mammals edit intestine transcribed apolipoprotein B mRNA, possibly using RNA catalyst.
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Date Modified: 2022.0224