Hydroxyl radical footprinting in vivo: mapping macromolecular structures with synchrotron radiation.
Hydroxyl radical footprinting in vivo: mapping macromolecular structures with synchrotron radiation.
复制标题
体内羟基自由基足迹:用同步辐射绘制大分子结构。
DOI:
10.1093/nar/gkl291
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发表时间:
2006-05-08
影响因子:
14.9
通讯作者:
Woodson, Sarah A.
中科院分区:
文献类型:
--
作者:
Adilakshmi, Tadepalli;Lease, Richard A.;Woodson, Sarah A.
We used a high flux synchrotron X-ray beam to map the structure of 16S rRNA and RNase P in viable bacteria in situ. A 300 ms exposure to the X-ray beam was sufficient for optimal cleavage of the phosphodiester backbone. The in vivo footprints of the 16S rRNA in frozen cells were similar to those obtained in vitro and were consistent with the predicted accessibility of the RNA backbone to hydroxyl radical. Protection or enhanced cleavage of certain nucleotides in vivo can be explained by interactions with tRNA and perturbation of the subunit interface. Thus, short exposures to a synchrotron X-ray beam can footprint the tertiary structure and protein contacts of RNA–protein complexes with nucleotide resolution in living cells.
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