PCR-based site-direct mutagenesis was performed to mutate cystine73 (coded by TG218C) into a presumed functional tyrosine73 (coded by TAC) in a manner similar to that described above for PcAad1Cys76p, except that primer set ScAad3MutCys2Tyr_B1/ScAad3MutCys2Tyr_C1 was used against template vector pGS21a-ScAad3. The resulting constructs were screened by colony PCR using the primer set AAD3_pGS_F/AAD3_pGS_R, validated by Sanger sequencing, and then named pGS21a-ScAad3Cys73Tyr.
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