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-Structure paper
タイトル | Convergent allostery in ribonucleotide reductase. |
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ジャーナル・号・ページ | Nat Commun, Vol. 10, Issue 1, Page 2653, Year 2019 |
掲載日 | 2019年6月14日 |
著者 | William C Thomas / F Phil Brooks / Audrey A Burnim / John-Paul Bacik / JoAnne Stubbe / Jason T Kaelber / James Z Chen / Nozomi Ando / |
PubMed 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. |
リンク | Nat Commun / PubMed:31201319 / PubMed Central |
手法 | EM (らせん対称) / X線回折 |
解像度 | 2.5 - 6.0 Å |
構造データ | EMDB-9272, PDB-6mw3: EMDB-9293, PDB-6myx: PDB-6mt9: PDB-6mv9: PDB-6mve: |
化合物 | ChemComp-TTP: ChemComp-ADP: ChemComp-ATP: ChemComp-MG: ChemComp-HOH: ChemComp-DTP: |
由来 |
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キーワード | OXIDOREDUCTASE / ribonucleotide reductase / allostery / nucleotide metabolism / dATP / ATP / filament / PROTEIN FIBRIL |