伊诺西六酸盐结合在ADAR2核中,并且需要用于RNA编辑
Mark R Macbeth1, Heidi L Schubert, Andrew P Vandemark
1Department of Biochemistry, University of Utah, Salt Lake City, UT 84132, USA.
概括
人类ADAR2的晶体结构显示,内醇基酸盐 (IP6) 对于RNA编辑活动至关重要. 这种辅助因子对于转移RNA (tRNA) 编辑中的相关酶ADAT1也至关重要.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 分子生物学分子生物学
背景情况:
- 作用于RNA的腺氨酸脱氨酶 (ADARs) 是参与RNA编辑的酶.
- 人类ADAR2的催化领域及其辅因子要求尚未完全理解.
研究的目的:
- 为了确定人类ADAR2的催化域的晶体结构2.
- 调查伊诺西六酸盐 (IP6) 在ADAR2和ADAT1酶活性中的作用.
主要方法:
- 在1.7安格斯特罗姆分辨率的X射线晶体学.
- 生物化学测试以测试具有和没有IP6的酶活性.
- 在ADAR2和ADAT之间对保存的氨基酸进行比较分析.
主要成果:
- 阐明了人类ADAR2催化域的晶体结构,显示了活性位点中的离子.
- 伊诺西六合酸盐 (IP6) 被发现意外地被埋在酶核心中,稳定了它的折叠.
- IP6被证明对ADAR2和ADAT1.1的催化活性至关重要.
结论:
- IP6是人类ADAR2RNA编辑活动的关键辅因子.
- IP6的结构和功能作用扩展到相关的酶,如ADAT1,对于转移RNA (tRNA) 编辑至关重要.
- 这一发现重新定义了对ADAR和ADAT酶的辅因子要求的理解.
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