FUNCTION: [Isoform 1]: Adds and repairs the conserved 3'-CCA sequence necessary for the attachment of amino acids to the 3' terminus of tRNA molecules, using CTP and ATP as substrates. {ECO:0000269|PubMed:11504732}.; FUNCTION: [Isoform 2]: Adds 2 C residues (CC-) to the 3' terminus of tRNA molecules...
                        FUNCTION: [Isoform 1]: Adds and repairs the conserved 3'-CCA sequence necessary for the attachment of amino acids to the 3' terminus of tRNA molecules, using CTP and ATP as substrates. {ECO:0000269|PubMed:11504732}.; FUNCTION: [Isoform 2]: Adds 2 C residues (CC-) to the 3' terminus of tRNA molecules instead of a complete CCA end as isoform 1 does (in vitro). {ECO:0000269|PubMed:17204286}.
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                        GO - Biological processes (BP): 
                        mitochondrial tRNA 3'-end processing [GO:1990180]; tRNA 3'-end processing [GO:0042780]; tRNA 3'-terminal CCA addition [GO:0001680]...
                        mitochondrial tRNA 3'-end processing [GO:1990180]; tRNA 3'-end processing [GO:0042780]; tRNA 3'-terminal CCA addition [GO:0001680]
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                        GO - Molecular function (MF): 
                        5'-3' RNA polymerase activity [GO:0034062]; ATP:3'-cytidine-cytidine-tRNA adenylyltransferase activity [GO:0052929]; ATP binding [GO:0005524]; CTP:3'-cytidine-tRNA cytidylyltransferase activity [GO:0052928]; CTP:tRNA cytidylyltransferase activity [GO:0052927]; tRNA binding [GO:0000049]; tRNA cytidyl...
                        5'-3' RNA polymerase activity [GO:0034062]; ATP:3'-cytidine-cytidine-tRNA adenylyltransferase activity [GO:0052929]; ATP binding [GO:0005524]; CTP:3'-cytidine-tRNA cytidylyltransferase activity [GO:0052928]; CTP:tRNA cytidylyltransferase activity [GO:0052927]; tRNA binding [GO:0000049]; tRNA cytidylyltransferase activity [GO:0016437]
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                        GO - Cellular component (CC): 
                        mitochondrial matrix [GO:0005759]; mitochondrion [GO:0005739]; nucleoplasm [GO:0005654]...
                        mitochondrial matrix [GO:0005759]; mitochondrion [GO:0005739]; nucleoplasm [GO:0005654]
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