6.5.1.3 D292E about 10% of the ligation activity of wild-type enzyme 662241 6.5.1.3 E296A about 10% of the ligation activity of wild-type enzyme 662241 6.5.1.3 Y5A about 10% of the RNA ligation activity of wild-type enzyme, mutant enzyme displays 39% of the adenylyltransferase activity observed with wild-type enzyme 662241 6.5.1.3 K54A about 15% of the RNA ligation activity of wild-type enzyme, mutant displays near wild-type adenylyltransferase activity 662241 6.5.1.3 Q106A about 20% of the RNA ligation activity of wild-type enzyme, mutant displays near wild-type adenylyltransferase activity 662241 6.5.1.3 S292N about 25% of the ligation activity of wild-type enzyme 662241 6.5.1.3 R155A about 35% of the ligation activity of wild-type enzyme, mutant enzyme displays 16% of the adenylyltransferase activity observed with wild-type enzyme 662241 6.5.1.3 D135A about 5% of the ligation activity of wild-type enzyme, mutant enzyme displays 4% of the adenylyltransferase activity observed with wild-type enzyme 662241 6.5.1.3 S170A about 5% of the ligation activity of wild-type enzyme, mutant enzyme displays 8% of the adenylyltransferase activity observed with wild-type enzyme 662241 6.5.1.3 E300A about 50% of the ligation activity of wild-type enzyme 662241