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酵母Pah1酸盐酸酶活性和细胞功能的活性位点决定因素

Geordan J Stukey¹, Parth K Sharma¹, Ruta Jog¹

¹Department of Food Science and the Rutgers Center for Lipid Research, Rutgers University, New Brunswick, New Jersey, USA.

The Journal of biological chemistry

|July 18, 2025

概括

该研究确定了酵母Pah1中的关键活性部位残留物,一种酸盐酸酶,对其酶活性和细胞功能至关重要. 这些发现提供了对脂质代谢和相关疾病的见解.

科学领域:

生物化学生化学
分子生物学分子生物学
酵母遗传学酵母遗传学

背景情况:

Pah1是Saccharomyces cerevisiae中的一个关键的酸盐 (PA) 酸酶,调节糖醇和PA水平.
这些脂质对于三糖醇合成,膜脂生产和各种细胞过程至关重要.
Pah1的催化核心具有类似于酸脱基酶的酸域,具有保存的I-IV动机.

研究的目的:

识别和描述酵母Pah1的活性部位动图和基本残留物.
研究这些保存残留物对Pah1的催化活性和细胞作用的功能重要性.
提供Pah1功能及其对人类lipin相关疾病的影响的机制性理解.

主要方法:

序列对齐和AlphaFold建模以识别保存的动机和残留物.
部位定向突变发生,以分析保存的活性部位残留物的功能.
有限的蛋白质分解和脂质体结合测试,以评估结构完整性和膜协会.

主要成果:

在Pah1.中确定了四个活性位点动图 (I-IV) 和动图II中的一个额外的保存残留物 (Arg-445).
在I-IV基因内保存的残留物中的突变取消了Pah1的酸盐酸酶 (PAP) 活性和细胞功能.
突变没有影响Pah1的整体结构或膜结合能力,这表明它们在催化中的特定作用.

结论:

已识别的活性部位动图及其保存的残留物对Pah1的PAP活动至关重要.
这些发现阐明了Pah1的催化机制及其在脂质代谢中的作用.
这项研究为了解与人类脂酸酸盐酸酶突变相关的脂相关疾病提供了机制基础.

关键词:

在PA酸酶中.甲基甘油 (diacylglycerol) 是一种含有甲基的物质.脂质新陈代谢脂质新陈代谢李平平是个不错的人.酸酸是一种酸盐.脂酸是一种脂酸.三甲基甘油三甲基甘油三甲基甘油

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