- EMDB-9272: EM structure of Bacillus subtilis ribonucleotide reductase inhibi... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-9272
タイトル
EM structure of Bacillus subtilis ribonucleotide reductase inhibited filament composed of NrdE alpha subunit and NrdF beta subunit with dATP
マップデータ
ASU of Bacillus subtilis ribonucleotide reductase inhibited filament composed of NrdE alpha and NrdF beta subunits with dATP. Handedness already corrected by reference to NrdE crystal structures.
試料
複合体: Inhibited filament of ribonucleoside-diphosphate reductase composed of NrdE alpha subunits and NrdF beta subunit tails
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM124847
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM100008
米国
引用
ジャーナル: Nat Commun / 年: 2019 タイトル: Convergent allostery in ribonucleotide reductase. 著者: William C Thomas / F Phil Brooks / Audrey A Burnim / John-Paul Bacik / JoAnne Stubbe / Jason T Kaelber / James Z Chen / Nozomi Ando / 要旨: Ribonucleotide reductases (RNRs) use a conserved radical-based mechanism to catalyze the conversion of ribonucleotides to deoxyribonucleotides. Within the RNR family, class Ib RNRs are notable for ...Ribonucleotide reductases (RNRs) use a conserved radical-based mechanism to catalyze the conversion of ribonucleotides to deoxyribonucleotides. Within the RNR family, class Ib RNRs are notable for being largely restricted to bacteria, including many pathogens, and for lacking an evolutionarily mobile ATP-cone domain that allosterically controls overall activity. In this study, we report the emergence of a distinct and unexpected mechanism of activity regulation in the sole RNR of the model organism Bacillus subtilis. Using a hypothesis-driven structural approach that combines the strengths of small-angle X-ray scattering (SAXS), crystallography, and cryo-electron microscopy (cryo-EM), we describe the reversible interconversion of six unique structures, including a flexible active tetramer and two inhibited helical filaments. These structures reveal the conformational gymnastics necessary for RNR activity and the molecular basis for its control via an evolutionarily convergent form of allostery.
ダウンロード / ファイル: emd_9272.map.gz / 形式: CCP4 / 大きさ: 52.7 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
ASU of Bacillus subtilis ribonucleotide reductase inhibited filament composed of NrdE alpha and NrdF beta subunits with dATP. Handedness already corrected by reference to NrdE crystal structures.
超分子 #1: Inhibited filament of ribonucleoside-diphosphate reductase compos...
超分子
名称: Inhibited filament of ribonucleoside-diphosphate reductase composed of NrdE alpha subunits and NrdF beta subunit tails タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1-#2 詳細: Beta subunit core density only visible at low threshold. Beta subunit tail is bound with strong density to alpha subunit and modeled as a poly-A peptide in the model.
詳細: Glycerol in original storage buffer was diluted to < 0.25% w/v.
グリッド
詳細: unspecified
凍結
凍結剤: ETHANE / チャンバー内湿度: 95 % / 装置: LEICA EM GP
詳細
Cryo-EM samples of the NrdEF filament were prepared by mixing 20 uM C382S holo-NrdE with 20 or 40 uM Mn-reconstituted NrdF in assay buffer with 100 uM dATP and 1 mM CDP, prior to dilution with nucleotide-containing buffer to a concentration of 5 uM protein. A subset of the grids were pre-coated with a support film of continuous, amorphous carbon by flotation of cleaved mica. For these grids, the sample was diluted to a final protein concentration of 2 uM.