+検索条件
-Structure paper
タイトル | Structural and mechanistic basis for recognition of alternative tRNA precursor substrates by bacterial ribonuclease P. |
---|---|
ジャーナル・号・ページ | Nat Commun, Vol. 13, Issue 1, Page 5120, Year 2022 |
掲載日 | 2022年8月31日 |
著者 | Jiaqiang Zhu / Wei Huang / Jing Zhao / Loc Huynh / Derek J Taylor / Michael E Harris / |
PubMed 要旨 | Binding of precursor tRNAs (ptRNAs) by bacterial ribonuclease P (RNase P) involves an encounter complex (ES) that isomerizes to a catalytic conformation (ES*). However, the structures of ...Binding of precursor tRNAs (ptRNAs) by bacterial ribonuclease P (RNase P) involves an encounter complex (ES) that isomerizes to a catalytic conformation (ES*). However, the structures of intermediates and the conformational changes that occur during binding are poorly understood. Here, we show that pairing between the 5' leader and 3'RCCA extending the acceptor stem of ptRNA inhibits ES* formation. Cryo-electron microscopy single particle analysis reveals a dynamic enzyme that becomes ordered upon formation of ES* in which extended acceptor stem pairing is unwound. Comparisons of structures with alternative ptRNAs reveals that once unwinding is completed RNase P primarily uses stacking interactions and shape complementarity to accommodate alternative sequences at its cleavage site. Our study reveals active site interactions and conformational changes that drive molecular recognition by RNase P and lays the foundation for understanding how binding interactions are linked to helix unwinding and catalysis. |
リンク | Nat Commun / PubMed:36045135 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 3.1 - 3.4 Å |
構造データ | EMDB-26636, PDB-7uo0: EMDB-26637, PDB-7uo1: EMDB-26638, PDB-7uo2: EMDB-26640, PDB-7uo5: |
化合物 | ChemComp-CA: ChemComp-MG: |
由来 |
|
キーワード | HYDROLASE/RNA / ribozyme / protein-RNA complex / divalent ion / RNA / HYDROLASE-RNA complex |