Mutant 5’-primer
A266T CATGTCTTGCAAACCGTTCATCCATCTC
V267A CATGTCTTGCAAGCTGCGCATCCATCTCCTTTG
Double (A266T/V267A) CATGTCTTGCAAACCGCGCATCCATCTCCTTTG
A274V CCTTTGTCTGTGCATCGTGGGTTCCTTGGTTG
Triple1 (A266T/V267A/A274V) GCAAACCGCGCATCCATCTCCTTTGTCTGTGCATCGTG
H275Y GTCTGCTTATCGTGGGTTC
Leuloop
(A266T/V267A/A274V/H275Y)
CTTGCAAACCGCGCATCCATCTCCTTTGTCTGTGTATCGTG
L279F CCTTTGTCTGCTCATCGTGGGTTCTTTGGTTG
Triple2 (A274V/H275Y/L279F) CCTTTGTCTGTGTATCGTGGGTTCTTTGGTTG
Table 1: Primers used for construction of mutants.