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髓光链异型的自上而下的蛋白质组学定义了人类心脏中的室内特异性表达
Elizabeth F Bayne1, Kalina J Rossler2, Zachery R Gregorich3
1Department of Chemistry, University of Wisconsin-Madison, Madison, WI 53706, USA.
Journal of molecular and cellular cardiology
|June 16, 2023
概括
人类心脏中的肌光链 (MLC) 表达不是像以前认为的那样特定于室内. 顶向下的蛋白质组学揭示了对MLC异形分布和修改的新见解.
科学领域:
- 心血管生物学 心血管生物学
- 蛋白质组学是指蛋白质组学.
- 分子心脏病学分子心脏病学
背景情况:
- 髓光链 (MLC-1和-2) 调节心肌收缩.
- 人们认为心房和心室异型具有室内限制的表达.
- 最近的发现质疑了这些异构体的室内特异性表达.
研究的目的:
- 在所有四个心室中分析MLC-1和-2心房和心室异型体的表达.
- 调查MLC异型的潜在的翻译后修饰 (PTM).
- 为了确定成年人心脏中真正的室内特异性MLC异型.
主要方法:
- 采用了基于上下质谱 (MS) 的蛋白质组学.
- 分析是在成年非衰竭的人体捐赠心脏上进行的.
- 协奏MS (MS/MS) 用于蛋白质序列确认.
主要成果:
- 在心房中检测到心室MLC-2v异型,在N13处出现了新的除化PTM.
- MLC-1v和MLC-2a是唯一的异构体,表现出一致的室内受限表达.
- MLC-1v,而不是MLC-2v,是成年人心脏中心室特异的异型.
- 在男性心脏和女性心脏中观察到高MLC-2酸化.
结论:
- 人类心脏中MLC异型表达比以前认为的更复杂.
- MLC-1v是确定的心室特异性异型.
- 蛋白质组学提供了对心脏蛋白质表达和PTMs的无偏见.
- 在MLC-2酸化中基于性别的差异需要进一步研究.
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