Table 1.
Sequence of Oligonucleotide Primersa
| H154Nf | GGCCACGGAATTATGTTCGACAATGCAACAGGTATTGTTGTGG |
| H154Nr | CCACAACAATACCTGTTGCATTGTCGAACATAATTCCGTGGCC |
| H189Nfb | CGGGAAAAGAATCAGGCGATCGTAATCCCAAAGTACGCGAGGGTG |
| H189Nrb | CACCCTCGCGTACTTTGGGATTACGATCGCCTGATTCTTTTCCCG |
| D139Nf | CAGTAGCTTTCGATGTAAATATTCACCCAGCGGCG |
| D139Nr | CGCCGCTGGGTGAATATTTACATCGAAAGCTACTG |
Codons for mutation are in bold. Subscripts f and r represent forward and reverse primers, respectively.
These two primers were used to make the H154N/H189N double mutant, and the plasmid of H154 was the template.