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多种异构体的Photolumazine V结合MR1和差异激活MAIT细胞

Jason R Krawic¹, Nicole A Ladd², Meghan Cansler³

¹Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, OK.

Journal of immunology (Baltimore, Md. : 1950)

|January 26, 2024

概括

这项研究确定了一种新型分子,光素 (PL) V,由MR1向MAIT细胞呈现. 在PLV异构体中微妙的结构变化显著改变MAIT细胞的识别,突出显示MR1连接体的多样性.

科学领域:

免疫学免疫学免疫学
微生物学微生物学
结构生物学结构生物学

背景情况:

粘膜关联不变T细胞 (MAIT) 对抗微生物感染的免疫力至关重要.
大型组织相容性复合体 (MHC) 类I相关蛋白1 (MR1) 向MAIT细胞呈现微生物代谢物.
了解MR1配体是解读MAIT细胞激活的关键.

研究的目的:

为了描述由Mycobacterium smegmatis产生的MR1配体.
识别和分析新型MR1配体及其结构变异.
为了研究连接体结构微异质性对T细胞受体 (TCR) 识别的影响.

主要方法:

质谱法用于识别来自M. smegmatis的MR1配体.
新型连接体光胺 (PL) V及其同位素被合成并进行了表征.
进行了MR1表面转位试验和MAIT细胞克隆刺激试验.

主要成果:

发现了一种新型MR1连接体 - - 光胺 (PL) V,它是一种含有四个异构体的氨基-氨基胺.
所有四个PLV异构体都是由M. smegmatis产生的,至少有三种诱导MR1表面转位.
显著的MAIT细胞TCRs对PLV异构体呈现差异性反应,表明基于基组定位的TCR选择性.

结论:

MR1呈现结构多样化的配体,包括新的PLV分子.
在MR1配体内的结构微异质性显著影响MAIT细胞识别.
MAIT细胞TCR对MR1呈现的抗原的微妙变异表现出显著的选择性.

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