Fig. 2 in Rapid screening of glycosyltransferases in plants using a linear DNA expression template based cell-free transcription-translation system

Fig. 2. UPLC-MS analysis of isoquercitrin converted from quercetin by AtUGTs expressed in TX-TL. (A) A glycosylation reaction catalyzed by a UDP-glucose glycosyltransferase. (B) The chromatogram of the blank sample, which only has 50% methanol solvent. (C) The chromatogram of the negative group, which has TX-TL, quercetin, UDPglucose but no additional DNA. (D) The chromatogram of the quercetin standard. (E) The chromatogram of the isoquercitrin standard. (F–O) Chromatograms of products from the catalysis of quercetin by different AtUGTs (the final concentrations of the linear DNAs used for each AtUGTs are listed below in brackets): (F) AT1G07250 (32.25 nM), (G) AT1G07260 (29.24 nM), (H) AT2G36790 (20.64 nM), (I) AT2G15480 (29.98 nM), (J) AT2G15490 (29.50 nM), (K) AT3G16520 (25.03 nM), (L) AT3G21750 (23.7 nM), (M) AT3G46660 (24.14 nM), (N) AT4G15280 (24.47 nM), and (O) AT4G34138 (22.52 nM), see Supplementary Fig. S4 for the duplicate group. The y axis indicates ion signal abundance relative to the highest signal in each chromatogram (%). The numbers in the top right of each chromatogram (for instance 3.38e7 in [E]) indicate the ion counts represented by "100" relative abundance. The retention time of the isoquercitrin standard is 4.0 min, and the red arrow in each figure indicates the retention time of the product isoquercitrin. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)