According to Issac Gilman, these were possible functions of Bree's ribozyme
RNAse P related-tRNA synthesis
RNAse P is ribozyme which is cleaves the 5’ terminus of tRNA to give mature tRNA.
tRNA are involved in protein synthesis. Once the cell makes mRNA of the gene it wants the tRNA can ‘read’ the mRNA and transfer amino acids across so that they are in the correct order. The amino acids bind together to give a protein chain.
Splicsome related- intron/exon splicing
Splicosome is a ribozyme which cleaves introns out of the primary RNA to give the mature RNA (mRNA). Genes contain exons (sections which code for protein) and introns (junk). Before the mRNA can be read to make protein, these junk sequences (introns) need to be spliced out by the splicosome.
Hammerhead related: telomere synthesis
Telomeres are the end sections of chromosomes. Every time a cell replicates, it has to make another copy of all its chromosomes for the new cell. However every replication some of the telomere (end bits) are lost. Once all the telomeres are lost the cells stops dividing (hence we age etc). There is an enzyme which can make telomeres longer however it is inhibited by a ribozyme. It is thought hammerhead type ribozymes are responsible.
GlmS ribozyme related: fructose 6-phosphate pathway
GlmS is an enzyme which cleaves fructose 6-phosphate and glutamine to give glucosamine-6-phosphate which is important for metabolism. The mRNA of GlmS is a ribozyme. It can cleave itself. When GlmS is needed, the cell produces mRNA and this is made into the GlmS protein. However once there is enough GlmS, its own mRNA can cut itself up to stop its production.
Ref: GlmS glucosamine-6-phosphate activated ribozyme