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开发hERG使用PRM与单个同位素样本校准的绝对量化方法

Ge Chang¹, Fabusuyi A Aroge², Ravichandra Venkateshappa³

¹Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A1S6, Canada.

|August 12, 2024

概括

研究人员开发了一种新的质谱法,以量化人类以太基因相关基因 (hERG) 蛋白质副本的绝对数量. 这种技术在不需要控制的情况下提供精确的hERG表达水平,有助于进行心脏安全研究.

科学领域:

生物化学生物化学
分子生物学分子生物学
心脏病学心脏病学

背景情况:

人类以太-to-go-go相关基因 (hERG) 蛋白质形成Kv11.1通道,对心脏动作潜力至关重要.
hERG功能障碍与心律不整有关.
目前的方法评估hERG表达作为折叠变化,缺乏绝对量化.

研究的目的:

为绝对hERG蛋白质量测量开发一种简单,灵敏的方法.
用目标质谱法测量hERG的副本数量.
建立一个普遍可比的蛋白质量测量标准.

主要方法:

利用并行反应监测 (PRM),一种有针对性的质谱方法.
为了减轻矩阵效应,采用了重匹配光 (HML) 在样本校准.
根据标准加法方法验证的HML.

主要成果:

量化hERG的副本数,独立于控制.
使用四种蛋白型可以实现精确的hERG测量.
在HEK293T细胞中确定平均hERG拷贝为3.6 ± 0.5 × 10^6拷贝/细胞.

结论:

开发的PRM方法可以准确地绝对量化hERG蛋白质.
这种方法有助于在不同研究和蛋白质中直接比较hERG水平.
为心脏安全评估和药物开发提供了一个强大的工具.

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