ムービー
コントローラー
構造ビューア
EMN文献について
+検索条件
-Structure paper
| タイトル | Cryo-EM structure of a 40 kDa SAM-IV riboswitch RNA at 3.7 Å resolution. |
|---|---|
| ジャーナル・号・ページ | Nat Commun, Vol. 10, Issue 1, Page 5511, Year 2019 |
| 掲載日 | 2019年12月3日 |
 著者 | Kaiming Zhang / Shanshan Li / Kalli Kappel / Grigore Pintilie / Zhaoming Su / Tung-Chung Mou / Michael F Schmid / Rhiju Das / Wah Chiu /  |
| PubMed 要旨 | Specimens below 50 kDa have generally been considered too small to be analyzed by single-particle cryo-electron microscopy (cryo-EM). The high flexibility of pure RNAs makes it difficult to obtain ...Specimens below 50 kDa have generally been considered too small to be analyzed by single-particle cryo-electron microscopy (cryo-EM). The high flexibility of pure RNAs makes it difficult to obtain high-resolution structures by cryo-EM. In bacteria, riboswitches regulate sulfur metabolism through binding to the S-adenosylmethionine (SAM) ligand and offer compelling targets for new antibiotics. SAM-I, SAM-I/IV, and SAM-IV are the three most commonly found SAM riboswitches, but the structure of SAM-IV is still unknown. Here, we report the structures of apo and SAM-bound SAM-IV riboswitches (119-nt, ~40 kDa) to 3.7 Å and 4.1 Å resolution, respectively, using cryo-EM. The structures illustrate homologies in the ligand-binding core but distinct peripheral tertiary contacts in SAM-IV compared to SAM-I and SAM-I/IV. Our results demonstrate the feasibility of resolving small RNAs with enough detail to enable detection of their ligand-binding pockets and suggest that cryo-EM could play a role in structure-assisted drug design for RNA. |
 リンク | Nat Commun / PubMed:31796736 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.7 - 4.1 Å |
| 構造データ | EMDB-20755, PDB-6ues: EMDB-20756, PDB-6uet: |
| 化合物 |  ChemComp-SAM: |
| 由来 |
|
 キーワード | RNA / SAM-IV riboswitch / Cryo-EM / Small RNA |
Helicobacter pylori (ピロリ菌)
