A plasmid pET28aM01A82W
containing the M01A82W variant (R47L/A82W/F87V/L188Q/E267V) was used
as a template for the mutation.34 (link) Specifically,
under the action of Fast Mutagenesis System (TransGen Biotech, Beijing,
China), M01A82W was mutated into another BM3 variant M13 (R47L/L86I/F87V/L188Q),
thereby generating another plasmid pET28aM13.19 (link) Next, pET28aM13 was used as the template to yield diverse pET-28a
(+) derived plasmids containing M13 variants using Fast Mutagenesis
System. The primers used for the mutation are listed in Table S1. The presence of the desired mutations
in M13 was confirmed by DNA sequencing.
E. coli strains Trans1-T1 and Transetta
(DE3) (TransGen Biotech, Beijing, China) served as hosts for recombinant
plasmid amplification and enzyme expression, respectively.
Genistein
was purchased from Yuanye (Shanghai yuanye Bio-Technology
Co., Ltd., Shanghai, China).