期刊
BIOCHIMIE
卷 92, 期 7, 页码 772-778出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.biochi.2010.02.018
关键词
Bacterial RNase P; RNA-protein interaction; Magnetic detection; Magnetic beads
资金
- Deutsche Forschungsgemeinschaft [HA 1672/14-1/3, GRK 1384]
A magnetic sensor technique was applied to analyze the interaction of immobilized bacterial RNase P protein and 3'-biotinylated RNase P RNA bound to streptavidin-coated magnetic beads. Our measurements with three types of beads from different suppliers resulted in K-d values of about 1-2 nM (at 4.5 mM Mg2+ and 150 mM NH4+) for Escherichia coli RNase P RNA and protein, consistent with previous analyses using different techniques. We further measured affinity of the E. coli RNase P protein to chimeric RNase P RNA variants, consisting of an E. coli specificity domain and an engineered archaeal catalytic domain. A bacterial-like 1-bp insertion and 2-nt deletion in the helix P2/P3 region largely improved affinity, providing independent evidence that these elements are crucial for interaction of the two RNase P subunits. Moreover, our study documents that the properties of the streptavidin-coated magnetic beads decide on success or failure of the technique. (C) 2010 Elsevier Masson SAS. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据