Journal: Synthetic and Systems Biotechnology

Article Title: Functional characterization of four glycosyltransferases for biosynthesis of steroidal saponins in medicinal plant Paris polyphylla

doi: 10.1016/j.synbio.2026.04.002

Figure Lengend Snippet: Reaction schemes and LC-MS analysis of Pp UGTs reactions with diosgenin and pennogenin . ( a ) Biosynthesis of trillin mediated by UGT91BP2 and UGT703R1–3 through transferring glucose from UDP-glucose to the C-3 OH position of diosgenin. ( b ) Extracted ion chromatograms (EICs) of the in vitro enzyme activity assays of recombinant UGT91BP2 and UGT703R1–3 with UDP-glucose and diosgenin showing the formation of trillin, as compared to the authentic trillin standard. Control is the empty expression vector. ( c ) MS spectra of the enzymatic reaction products in hydrogen and sodium ion adducts compared to the fragmentation pattern of the trillin standard. The product molecular ions [M + H] + and [M +Na] + and the feature fragment ion [M + H − Glc] + with m / z 415.32 are marked. Of note, additional peaks observed in the diosgenin EIC ( m / z 415.32) for UGT703R1–3 might correspond to substrate isomeric impurities, in-source adducts, or minor non-enzymatic by-products; these peaks, which arose from the extracted ion flow of the substrate m / z , did not co-elute with the product, trillin , and therefore did not affect the interpretation of the product formation. ( d ) Biosynthesis of pennogenin 3- O -glucoside mediated by the UGT703R1–3 through transferring glucose from UDP-glucose to the C-3 OH position of pennogenin. ( e ) EICs of the in vitro enzyme activity assays of recombinant UGT91BP2 and UGT703R1–3 with UDP-glucose and pennogenin showing the formation of pennogenin 3- O -glucoside, compared to the control empty expression vector. ( f ) MS/MS spectra ([M + H – Glc] + and [M + H – Glc − H 2 O] + ) of the enzymatic reaction products.

Article Snippet: Diosgenin, pennogenin, and trillin standard compounds were purchased from Chengdu Push Biotechnology Co., Ltd., and Shanghai Yuanye Biotechnology Co., Ltd. (China).

Techniques: Liquid Chromatography with Mass Spectroscopy, Transferring, In Vitro, Activity Assay, Recombinant, Control, Expressing, Plasmid Preparation, Tandem Mass Spectroscopy

Journal: Synthetic and Systems Biotechnology

Article Title: Functional characterization of four glycosyltransferases for biosynthesis of steroidal saponins in medicinal plant Paris polyphylla

doi: 10.1016/j.synbio.2026.04.002

Figure Lengend Snippet: Transient expression and characterization of Pp UGTs in Nicotiana benthamiana . ( a ) UHPLC-MS traces of the trillin formation in N. benthamiana leaf extracts transiently expressing UGT91BP2 and UGT703R1–3 with the infiltration of diosgenin substrate, compared to trillin authentic standard and empty vector control. Q1: parent ion; Q3: daughter ion. ( b ) Confocal microscopic images of the localization of UGT91BP2-GFP, UGT703R1-GFP, UGT703R2-GFP and UGT703R3-GFP in N. benthamiana leaves. DAPI (a nuclear-specific fluorescence dye) acts as a nucleus indicator. Scale bars, 20 μm. The experiments were repeated two times with similar results.

Article Snippet: Diosgenin, pennogenin, and trillin standard compounds were purchased from Chengdu Push Biotechnology Co., Ltd., and Shanghai Yuanye Biotechnology Co., Ltd. (China).

Techniques: Expressing, Plasmid Preparation, Control, Fluorescence

Journal: eLife

Article Title: Multiplexed CRISPRi reveals a transcriptional switch between KLF activators and repressors in the maturing neocortex

doi: 10.7554/eLife.106510

Figure Lengend Snippet:

Article Snippet: Chemical compound , Opal 620 , Akoya Biosciences , FP1495001KT , 1:750 –1:1500.

Techniques: