Abstract
Ribonuclease P (RNase P) is a key enzyme involved in tRNA biosynthesis. It catalyses the endonucleolytic cleavage of nearly all tRNA precursors to produce 5'-end matured tRNA. RNase P activity has been found in all organisms examined, from bacteria to mammals. Eubacterial RNase RNA is the only known RNA enzyme which functions in trans in nature. Similar behaviour has not been demonstrated in RNase P enzymes examined from archaebacteria or eukaryotes. Characterisation of RNase P enzymes from more diverse eukaryotic species, including the slime mold Dictyostelium discoideum, is useful for comparative analysis of the structure and function of eukaryotic RNase P.
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