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.
粘膜相关不变 T (MAIT) 细胞是一类丰富的先天 T 细胞,受 MHC I 相关分子 MR1 的限制。 MAIT 细胞可以识别 MR1 呈现的核黄素途径中细菌衍生的代谢中间体,并被认为通过产生细胞因子和直接杀灭细菌,在先天抗菌免疫中发挥作用。 MR1 四聚体通常由 5-氨基-6-D-核糖氨基尿嘧啶 (5-A-RU) 和甲基乙二醛 (MeG) 的加合物稳定,是研究 MAIT 细胞的重要工具。 5-A-RU 的一个长期存在的问题是它在存储时不稳定。在此,我们报告了一种该配体 HCl 盐的有效合成方法,该方法提高了储存期间的稳定性。我们还表明,通过这种方法产生的合成 5-A-RU·HCl 可用于刺激人类 MAIT 细胞以及生产人类和小鼠 MR1 四聚体以进行 MAIT 细胞鉴定的方案。