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RNase P, an enzyme with RNA and protein subunits, cleaves tRNA precursor molecules to form the 5' termini of mature tRNAs in both prokaryotes and eukaryotes. Rabbit antibodies made against the protein subunit, C5 protein, of Escherichia coli RNase P bound RNase P protein from E. coli and Bacillus subtilis in immunoblots and solid-phase immunoassays. These rabbit anti-C5 antibodies also bound a protein (Mr approximately 40,000) in preparations of RNase P from human (HeLa) cells and depleted the enzymatic activity from preparations of RNase P from both human and E. coli cells. Finally, rabbit anti-C5 antibodies immunoprecipitated from crude extracts of human cells a ribonucleoprotein complex containing H1 RNA, the putative RNA component of human RNase P. These results show that an antigenic determinant is shared by C5 protein from E. coli RNase P and a protein component of RNase P from human cells.

An immunological determinant of RNase P protein is conserved between Escherichia coli and humans.