Agonistic or antagonistic mucosal-associated invariant T (MAIT) cell activity is determined by the 6-alkylamino substituent on uracil MR1 ligands
作者:Chriselle D. Braganza、Chihiro Motozono、Koh-Hei Sonoda、Sho Yamasaki、Kensuke Shibata、Mattie S. M. Timmer、Bridget L. Stocker
DOI:10.1039/d0cc00247j
日期:——
The 6-alkylamino side chain of aminouracil MR1 ligands controls MAIT cell agonistic or antagonistic activity.
6-烷基氨基尿嘧啶MR1配体的侧链控制MAIT细胞的激动或拮抗活性。
Design, Synthesis, and Evaluation of 6-Carboxyalkyl and 6-Phosphonoxyalkyl Derivatives of 7-Oxo-8-ribitylaminolumazines as Inhibitors of Riboflavin Synthase and Lumazine Synthase
6-carboxyalkyl and 6-phosphonoxyalkyl derivatives of 7-oxo-8-D-ribityllumazine were synthesized as inhibitors of both Escherichia coli riboflavinsynthase and Bacillus subtilis lumazinesynthase. The compounds were designed to bind to both the ribitylpurine binding site and the phosphate binding site of lumazinesynthase. In the carboxyalkyl series, maximum activity against both enzymes was observed with the
Location, location, location: All the stereoisomers of 5‐OP‐RU were synthesized to elucidate the effects of its stereochemistry on MR1‐dependent MAIT cell activation. Of the stereoisomers, only the 4’‐OH epimer demonstrated potent MAIT cell activity, thus indicating that the configuration of the 2’‐OH and 3’‐OH group could be important for agonistic activity.
Synthesis, stabilization, and characterization of the MR1 ligand precursor 5-amino-6-D-ribitylaminouracil (5-A-RU)
作者:Kelin Li、Charles K. Vorkas、Ashutosh Chaudhry、Donielle L. Bell、Richard A. Willis、Alexander Rudensky、John D. Altman、Michael S. Glickman、Jeffrey Aubé
DOI:10.1371/journal.pone.0191837
日期:——
Mucosal-associated invariant T (MAIT) cells are an abundant class of innate T cells restricted by the MHC I-related molecule MR1. MAIT cells can recognize bacterially-derived metabolic intermediates from the riboflavin pathway presented by MR1 and are postulated to play a role in innate antibacterial immunity through production of cytokines and direct bacterial killing. MR1 tetramers, typically stabilized by the adduct of 5-amino-6-D-ribitylaminouracil (5-A-RU) and methylglyoxal (MeG), are important tools for the study of MAIT cells. A long-standing problem with 5-A-RU is that it is unstable upon storage. Herein we report an efficient synthetic approach to the HCl salt of this ligand, which has improved stability during storage. We also show that synthetic 5-A-RU•HCl produced by this method may be used in protocols for the stimulation of human MAIT cells and production of both human and mouse MR1 tetramers for MAIT cell identification.
Biosynthesis of Riboflavin. The Reaction Catalyzed by 6,7-Dimethyl-8-ribityllumazine Synthase Can Proceed without Enzymatic Catalysis under Physiological Conditions<sup>†</sup>
作者:Klaus Kis、Karl Kugelbrey、Adelbert Bacher
DOI:10.1021/jo001120s
日期:2001.4.1
lumazine by condensation of 5-amino-6-ribitylamino-2,4(1H,3H)-pyrimidinedione and 3,4-dihydroxy-2-butanone 4-phosphate is catalyzed by the enzyme, lumazine synthase. We show that the condensation reaction can proceed without enzyme catalysis in dilute aqueous solution at room temperature and neutral pH. The reaction rate is proportional to e (pH). The activation energy of the uncatalyzed reaction is E(a)