对人体酸合成酶1的分子洞察表明,其抑制促进了LDL的吸收
Tao Long1, Dongyu Li1, Goncalo Vale2
1Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
Cell
|August 29, 2024
概括
对酸酶合成酶1 (PSS1) 的结构洞察力揭示了它的机制和抑制. 这项研究确定了PSS1抑制剂作为Lenz- Majewski综合征和高胆固醇的潜在治疗方法.
科学领域:
- 生物化学
- 结构生物学
- 细胞生物学
背景情况:
- 哺乳动物细胞通过两种合成合成酸 (PS).
- 在Ptdss1中获得功能突变会导致Lenz-Majewski综合征 (LMS).
- 药理上抑制PSS1可以抑制瘤生长.
研究的目的:
- 确定人类PSS1 (野生型和LMS突变) 和其抑制剂复合物的冷EM结构.
- 阐明PSS1介导PS合成的机制.
- 调查PSS1的全抑制及其下游效应.
主要方法:
- 电子显微镜 (cryo-EM) 解析PSS1变体和抑制剂复合物的结构.
- 生物化学测定用于研究酶活性和全抑制.
- 对SREBP通路激活和LDL受体表达的分析.
主要成果:
- 确定野生型PSS1,导致LMS的PSS1P269S突变的冷EM结构,以及与抑制剂DS55980254复合的PSS1.
- 透露了由4-8跨膜螺旋体形成的催化核心,表明类似于膜结合的O-转移酶的机制.
- 通过PS和DS55980254证明了PSS1的全质抑制,DS55980254激活SREBP通路并增加LDL吸收.
结论:
- 通过PSS1发现了哺乳动物PS合成的结构基础和机制.
- 鉴定了DS55980254作为PSS1的一种全oster抑制剂.
- 表明选择性PSS1抑制剂对LMS和降低血胆固醇水平的潜在治疗应用.
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