A. Cell growth on Fluconazole. 4 µl five-fold serial dilutions of BY4741 WT cells, pdr5 null mutant cells, and cells expressing PDR5-1, which was reconstructed with YPDR5 TMDR1 and BPDR5 TMDR2 and PDR5-2, which was reconstructed with BPDR5 TMDR1 and YPDR5 TMDR2, were spotted on SC-uracil drug agar plates. Before spotting, all strains were grown to exponential phase, diluted to 0.2 OD600. Plates were incubated for 3 days at 30°C. The results indicate that the TMDR1 in YJM789 PDR5 is functional (row #1 vs. row #3), but the TMDR2 in YJM789 PDR5 cannot conduct its original function (row #1 vs. row #4). B. Expression of hybrid constructs. Electrophoresis result for RT- PCR products was depicted. Total RNA (lane 1) and cDNA (lane 2) of pdr5Δ null mutant cells harboring YEplac195-PDR5-1, total RNA (lane 3) and cDNA (lane 4) of pdr5Δ null mutant cells harboring YEplac195-PDR5-2 were amplified by specific primer pairs. The result indicates that both constructs can be expressed successfully in the BY4741Δpdr5 background.