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能够处理具有新型PC固特异性的抗原的aminopeptidase ERAP1变体的结构导向发现

Suchita Pande^1,2, Hwai-Chen Guo¹

¹Department of Biological Sciences, University of Massachusetts Lowell, Lowell, Massachusetts, USA.

|October 20, 2023

概括

细胞内网膜氨基酶1 (ERAP1) 识别了基质基残留物. 一个特定的突变改变了ERAP1的基质偏好,突出了SC子站点在抗原处理和免疫反应调节中的作用.

科学领域:

生物化学生物化学
免疫学免疫学免疫学
结构生物学结构生物学

背景情况:

细胞内膜网膜氨基酶1 (ERAP1) 对于切割抗原对于主要基因相容性复合体 (MHC) 呈现至关重要.
ERAP1使用一种分子统治机制,涉及N-和C-终端基质结合.
之前的研究确定了ERAP1 C-终端 (ERAP1_C) 域结构与类碳素 (PC) 末端,确定了用于残留物识别的SC子站点.

研究的目的:

通过结构导向突变发生和运动分析,研究ERAP1 SC亚站点的功能性作用.
检查SC子站点如何影响基质结合和剪切.
探索SC子站点作为调节免疫组的目标的潜力.

主要方法:

结构引导的ERAP1.1的位点导向突变发生.
水解动力学测试以确定酶活性.
片修剪试验用于评估基质的ERAP1处理.
分析基质偏好在突变后的变化.

主要成果:

在ERAP1中发生的V737R点突变显著改变了基质偏好.
突变将偏好从疏水转移到负电荷的PC基残留物.
这些发现证实了SC子站点直接参与识别基板PC的有效性.

结论:

ERAP1的SC子站点对于结合和识别基质基残留物至关重要.
针对SC子站点提供了一个潜在的策略来调节MHC受限制的免疫群.
了解ERAP1 SC亚站点相互作用是开发免疫调节疗法的关键.

关键词:

抗原处理动力学免疫性皮体 (immunopeptidomes) 是一种免疫性皮体.分子统治者机制分子统治者机制胡酸碳基 (PC) 的.特异性SC子站点的特异性

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