RNA-free RNase P that catalyzes the removal of the 5'-leader sequence from pre-tRNA to produce the mature 5'-terminus. Endonucleolytic cleavage of RNA, removing 5'-extranucleotides from tRNA precursor. Deletion mutant shows no growth phenotype under standard conditions or nitrogen deficiency. The ease to obtain knockout of this gene and the lack of growth phenotypes upon gene deletion suggests that archaeal HARPs do not make a major contribution to global tRNA 5'-end maturation in archaea, but may well exert a specialised, yet unknown function in (t)RNA metabolism. Belongs to the HARP family.