Chemo-enzymatic synthesis of fluorinated sugar nucleotide: useful mechanistic Probes for glycosyltransferases
摘要:
An effective procedure for the synthesis of 2-deoxy-2-fluoro-sugar nucleotides via Selectfluor-mediated electrophilic fluorination of glycals with concurrent nucleophilic addition or chemo-enzymatic transformation has been developed. and the fluorinated sugar nucleotides have been used as probes For glycosyltransferases, including fucosyltransferase III, V, VI, and VII, and sialyl transferases. In general, these fluorinated sugar nuclceotides act as competitive inhibitors versus sugar nucleotide substrates and form a tight complex with the glycosyltransferase. (C) 2000 Elsevier Science Ltd. All rights reserved.
Chemo-enzymatic synthesis of fluorinated sugar nucleotide: useful mechanistic Probes for glycosyltransferases
摘要:
An effective procedure for the synthesis of 2-deoxy-2-fluoro-sugar nucleotides via Selectfluor-mediated electrophilic fluorination of glycals with concurrent nucleophilic addition or chemo-enzymatic transformation has been developed. and the fluorinated sugar nucleotides have been used as probes For glycosyltransferases, including fucosyltransferase III, V, VI, and VII, and sialyl transferases. In general, these fluorinated sugar nuclceotides act as competitive inhibitors versus sugar nucleotide substrates and form a tight complex with the glycosyltransferase. (C) 2000 Elsevier Science Ltd. All rights reserved.
Chemoenzymatic synthesis of mono- and di-fluorinated Thomsen–Friedenreich (T) antigens and their sialylated derivatives
作者:Jun Yan、Xi Chen、Fengshan Wang、Hongzhi Cao
DOI:10.1039/c2ob26989a
日期:——
Fluorinated Thomsen–Friedenreich (T) antigens were synthesized efficiently from chemically produced fluorinated monosaccharides using a highly efficient one-pot two-enzyme chemoenzymatic approach containing a galactokinase and a D-galactosyl-β1–3-N-acetyl-D-hexosamine phosphorylase. These fluorinated T-antigens were further sialylated to form fluorinated ST-antigens using a one-pot two-enzyme system
氟化 Thomsen-Friedenreich (T) 抗原是使用含有半乳糖激酶和D-半乳糖基-β1-3- N-乙酰-D-己糖胺磷酸化酶的高效一锅双酶化学酶法从化学生产的氟化单糖有效合成的。使用含有 CMP-唾液酸合成酶和 α-2-3-唾液酸转移酶的一锅双酶系统将这些氟化 T 抗原进一步唾液酸化以形成氟化 ST 抗原。
Rapid Screening of Diverse Biotransformations for Enzyme Evolution
作者:Emily E. Kempa、James L. Galman、Fabio Parmeggiani、James R. Marshall、Julien Malassis、Clement Q. Fontenelle、Jean-Baptiste Vendeville、Bruno Linclau、Simon J. Charnock、Sabine L. Flitsch、Nicholas J. Turner、Perdita E. Barran
DOI:10.1021/jacsau.1c00027
日期:2021.4.26
of enzymes, in different formats, achieving sample throughputs equivalent to ∼40 s per sample. The heat map output allows rapid selection of active enzymes within 96-well plates facilitating identification of industrially relevant biocatalysts. This DiBT-MS screening workflow has been applied to the directed evolution of a phenylalanine ammonia lyase (PAL) as a case study, enhancing its activity toward
Enzymatic synthesis of UDP-(3-deoxy-3-fluoro)-d-galactose and UDP-(2-deoxy-2-fluoro)-d-galactose and substrate activity with UDP-galactopyranose mutase
作者:John N. Barlow、John S. Blanchard
DOI:10.1016/s0008-6215(00)00135-x
日期:2000.10
The novel UDP-sugar uridine 5'-(3-deoxy-3-fluoro-D-galactopyranosyl diphosphate) (I) and UDP-(2-deoxy-2-fluoro)-D-galactose (2) have been prepared enzymatically and tested as substrate analogues for the enzyme UDP-galactopyranose mutase (UDP-Galp mutase EC 5.4.99.9). Turnover of both 1 and 2 by UDP-Galp mutase was observed by HPLC and F-19 NMR. The HPLC elution profile and F-19 chemical shift of the products are consistent with the formation of the predicted furanose forms of 1 and 2. The K-m values for compounds 1 and 2 were similar to those of the natural substrate UDP-Galp (0.26 mM for 1, 0.2 mM for 2, and 0.6 mM for UDP-Galp), but the values for k(cat) were substantially different (1.6/min for I, 0.02/min for 2, and 1364/min for UDP-Galp). A correlation was also observed between the equilibrium yield of product formed during turnover of UDP-sugar by UDP-Galp mutase (UDP-Galp, compound 1 or compound 2), and the amount of furanose present for the free sugar at thermal equilibrium in aqueous solution, using H-1 and F-19 NMR spectroscopy. The implications of these results to the mechanism of the unusual enzymatic reaction are discussed. (C) 2000 Elsevier Science Ltd. All rights reserved.
Chemo-enzymatic synthesis of fluorinated sugar nucleotide: useful mechanistic Probes for glycosyltransferases
作者:Michael D Burkart、Stéphane P Vincent、Arno Düffels、Brion W Murray、Steven V Ley、Chi-Huey Wong
DOI:10.1016/s0968-0896(00)00139-5
日期:2000.8
An effective procedure for the synthesis of 2-deoxy-2-fluoro-sugar nucleotides via Selectfluor-mediated electrophilic fluorination of glycals with concurrent nucleophilic addition or chemo-enzymatic transformation has been developed. and the fluorinated sugar nucleotides have been used as probes For glycosyltransferases, including fucosyltransferase III, V, VI, and VII, and sialyl transferases. In general, these fluorinated sugar nuclceotides act as competitive inhibitors versus sugar nucleotide substrates and form a tight complex with the glycosyltransferase. (C) 2000 Elsevier Science Ltd. All rights reserved.