(tRNA)-3'-end (ribonucleoside 5'-phosphate)-(guanosyl 5'-phosphate)-(cytosyl 5'-phosphate)-(cytosyl 5'-phosphate)-(adenosine 5'-phosphate) + H2O = GpCpCpA + tRNA 3'-end (ribonucleotide 3'-phosphate) + H(+) — reaction