Subunit of RNase MRP%2C nuclear RNase P and telomerase%3B forms a soluble heterodimer with Pop6p that binds P3 domain of RNase MRP and RNase P RNAs%3B RNase MRP cleaves pre-rRNA%2C nuclear RNase P cleaves tRNA precursors to generate mature 5' ends and facilitates turnover of nuclear RNAs%2C while telomerase replenishes telomeric DNA