Essential peptidyl-tRNA hydrolase component of the mitochondrial large ribosomal subunit. Acts as a codon-independent translation release factor that has lost all stop codon specificity and directs the termination of translation in mitochondrion, possibly in case of abortive elongation. May be involved in the hydrolysis of peptidyl-tRNAs that have been prematurely terminated and thus in the recycling of stalled mitochondrial ribosomes (By similarity). an N-acyl-L-alpha-aminoacyl-tRNA + H2O = a tRNA + an N-acyl-L-amino acid + H(+) Component of the mitochondrial 39S ribosomal subunit. Belongs to the prokaryotic/mitochondrial release factor family. Mitochondrion-specific ribosomal protein mL62 subfamily. In contrast to other members of the family, lacks the regions that come into close contact with the mRNA in the ribosomal A-site and determine the STOP codon specificity, explaining the loss of codon specificity for translation release factor activity.