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. 2022 Oct 21;12:17658. doi: 10.1038/s41598-022-21678-3

Figure 1.

Figure 1

Construction of multigene expression vectors and biochemical analysis. (a) Assembly of individual expression vectors encoding TAS2R, mt-clytin II, and Gα16-gust44 by in vitro Cre-loxP recombination to generate type 1 and type 2 multigene vectors. With TAS2R as the gene of reference, the expression vectors are arranged in the following sequences in clockwise fashion: TAS2R–mt-clytin II–Gα16-gust44 (type 1) and TAS2R–Gα16-gust44–mt-clytin II (type 2). In both type 1 and type 2 plasmids, TAS2R is divergently orientated from mt-clytin II and Gα16-gust44 chimera. Black arrows indicate the direction of expression from the CMV or CAG promoter. Grey circles represent loxP sites. Only relevant elements of the expression constructs are shown for figure clarity. (b) Concentration–response curves of TAS2Rs upon stimulation with their cognate agonists in the bioluminescence-based intracellular calcium release assay. Type 2 vectors consistently produced larger assay spans than that of type 1 vectors. Data points are shown as mean ± s.e.m. from a representative experiment out of three independent biological replicates performed in technical quadruplicates. EC50, half-maximal effective concentration. Figure 1a was generated using Adobe Illustrator (Version 25.4.1).