National Aeronautic Space Administration (NASA, United States)
NNX14AK36G
米国
National Aeronautic Space Administration (NASA, United States)
80NSSC18K1139
米国
National Aeronautic Space Administration (NASA, United States)
NNX14AK16G
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
P41GM103832
米国
引用
ジャーナル: FEBS Open Bio / 年: 2020 タイトル: Cryo-electron microscopy visualization of a large insertion in the 5S ribosomal RNA of the extremely halophilic archaeon Halococcus morrhuae. 著者: Madhan R Tirumalai / Jason T Kaelber / Donghyun R Park / Quyen Tran / George E Fox / 要旨: The extreme halophile Halococcus morrhuae (ATCC 17082) contains a 108-nucleotide insertion in its 5S rRNA. Large rRNA expansions in Archaea are rare. This one almost doubles the length of the 5S rRNA. ...The extreme halophile Halococcus morrhuae (ATCC 17082) contains a 108-nucleotide insertion in its 5S rRNA. Large rRNA expansions in Archaea are rare. This one almost doubles the length of the 5S rRNA. In order to understand how such an insertion is accommodated in the ribosome, we obtained a cryo-electron microscopy reconstruction of the native large subunit at subnanometer resolution. The insertion site forms a four-way junction that fully preserves the canonical 5S rRNA structure. Moving away from the junction site, the inserted region is conformationally flexible and does not pack tightly against the large subunit. The high-salt requirement of the H. morrhuae ribosomes for their stability conflicted with the low-salt threshold for cryo-electron microscopy procedures. Despite this obstacle, this is the first cryo-electron microscopy map of Halococcus ribosomes.
凍結剤: ETHANE / チャンバー内湿度: 100 % / チャンバー内温度: 298 K / 装置: FEI VITROBOT MARK IV 詳細: 2 microliters of sample were applied to the grid, then 6 microliters of pure water was applied to the reverse face of the grid..