硫酸酶中的一种新型氨基酸修饰,在多重硫酸酶缺乏症中具有缺陷
B Schmidt1, T Selmer, A Ingendoh
1Universität Göttingen, Federal Republic of Germany.
Cell
|July 28, 1995
概括
多重硫酶缺乏症 (MSD) 是一种罕见的遗传疾病. 一个关键的蛋白质修饰,即将囊蛋白转化为2 - 氨基-3 - 氧酸,对于硫酶活性至关重要,其缺乏导致MSD.
科学领域:
- 生物化学 生物化学
- 遗传学 遗传学 是一个
- 分子生物学分子生物学
背景情况:
- 多重硫酶缺乏症 (MSD) 是一种溶酶体储存障碍.
- 肌肉硬化症的特征是所有已知的硫酸酶的活性降低.
- 在MSD中硫酶不活性的根本原因以前是未知的.
研究的目的:
- 研究MSD中硫酸酶活性降低的分子基础.
- 为了确定硫酸酶催化功能所需的常见的共同或后翻译性修饰.
主要方法:
- 活性硫酸盐酶的结构分析.
- 从健康个体和MSD患者的硫酶结构的比较.
- 在硫酸酶中对氨酸残留物修饰的分析.
主要成果:
- 活性硫酸酶的特点是氨酸残留物转化为2 - 氨基-3 - 氧酸.
- 来自MSD细胞的硫酶保留了未经修改的氨酸残留物.
- 这种转换是硫酸酶之间保存的修改.
结论:
- 氨酸转化为2-amino-3-oxopropionic酸对于硫酸酶的催化活性至关重要.
- 这种特定蛋白质修饰的缺乏是多重硫酶缺乏症的原因.
- 这一发现为MSD病原体提供了分子解释.
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