在哺乳动物中产生CDP-ribitol前体的Ribitol-phosphate的内源性还原酶活动
Shunsuke Hoshino1, Hiroshi Manya1, Rieko Imae1
1Molecular Glycobiology, Research Team for Mechanism of Aging, Tokyo Metropolitan Institute for Geriatrics and Gerontology, 35-2 Sakae-cho, Itabashi-ku, Tokyo 173-0015, Japan.
Journal of biochemistry
|December 23, 2023
概括
研究人员确定了核糖减少途径是人类细胞中D-ribitol-5-phosphate (Rbo5P) 的主要来源. 发现阿尔多基因减小酶B1 (AKR1B1) 是这种Rbo5P生产途径中的关键酶.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 在α-dystroglycan上的核心M3 O-mannosyl glycan对于结合细胞外矩阵分子至关重要.
- 核心M3甘氨酸的缺陷导致dystroglycanopathies,一个群体的先天性肌肉发育不良.
- 在M3甘氨酸中的D-ribitol-5-phosphate (Rbo5P) 结构是使用CDP-ribitol (CDP-Rbo) 合成的,但其在哺乳动物中的生物合成途径尚不清楚.
研究的目的:
- 为了阐明哺乳动物细胞内Rbo5P生产途径.
- 为了确定涉及Rbo5P生物合成的特定的阿尔多基因还原酶.
- 确定主导途径和关键还原酶负责内源Rbo5P生产.
主要方法:
- 研究了使用四种潜在基质的减少酶活性:核糖,核糖,核糖酸盐和核糖酸盐.
- 评估了阿尔多基因减少酶AKR1A1,AKR1B1和AKR1C1在这些途径中的作用.
- 利用HEK293T细胞研究内源Rbo5P的产生.
主要成果:
- 核糖减少途径被确定为HEK293T细胞内细胞内Rbo5P产生的主要贡献者.
- AKR1B1被确定为Rbo5P合成的核糖减少途径中主要的减少酶酶.
- 在Rbo5P生产的背景下,AKR1A1和AKR1C1的减少酶活性不那么显著.
结论:
- 主要由AKR1B1介导的核糖减少途径是人类细胞中D-ribitol-5-phosphate (Rbo5P) 生产的主要内源途径.
- 这一发现澄清了核心M3甘氨酸的生物合成中的关键步骤,这对于α-dystroglycan功能至关重要.
- 了解这种途径,可以了解二氧化甘油病变的分子基础和潜在的治疗点.
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