肝素硫酸盐可以选择性地抑制 cathepsin K 的原酶活性
Xiaoxiao Zhang1, Yin Luo1, Huanmeng Hao1
1Department of Oral Biology, School of Dental Medicine, University at Buffalo, the State University of New York, Buffalo, NY 14214, USA.
概括
肝素硫酸盐 (HS) 调节了甲素K (CtsK) 的结构和功能. 结合HS稳定了CtsK,促进了二分化并保持了酶活性,同时抑制了原酶活性,这表明HS寡糖类是潜在的治疗剂.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 分子药理学分子药理学
背景情况:
- 甲素K (CtsK) 是骨再吸收中的一个关键的囊蛋白酶,由骨质细胞高度表达.
- 已知CtsK与肝素硫酸盐 (HS) 之间的相互作用,但缺乏详细的结构和功能理解.
研究的目的:
- 阐明HS与CtsK结合的结构基础.
- 研究HS相互作用对CtsK酶活性的功能后果.
- 探索HS寡糖在调节CtsK活性中的治疗潜力.
主要方法:
- CtsK与HS寡糖的共同晶体学.
- 酶分析测量化酶和原酶活性.
- 在体外骨质细胞再吸收试验.
主要成果:
- HS与CtsK形成稳定的复合体,诱导二分化并揭示HS结合部位.
- 结合HS保留了CtsK酶的活性,但以硫化依赖的方式抑制了原酶的活性.
- 结构上定义的HS寡糖在体外阻断骨质细胞骨的再吸收,而不会影响骨质细胞的分化.
结论:
- HS是CtsK结构和功能的多方面的调节者.
- 远程的HS绑定站点解释了其对CtsK活动的双重监管作用.
- HS寡糖体代表了一种有前途的新类选择性CtsK抑制剂,用于过度骨再吸收的疾病.
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