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-Structure paper
| タイトル | Mechanism of activation of contact-dependent growth inhibition tRNase toxin by the amino acid biogenesis factor CysK in the bacterial competition system. |
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| ジャーナル・号・ページ | Nucleic Acids Res, Vol. 53, Issue 1, Year 2025 |
| 掲載日 | 2025年1月7日 |
著者 | Zhaohang Feng / Yuka Yashiro / Kozo Tomita / ![]() |
| PubMed 要旨 | Contact-dependent growth inhibition (CDI) is a bacterial competition mechanism, wherein the C-terminal toxin domain of CdiA protein (CdiA-CT) is transferred from one bacterium to another, impeding ...Contact-dependent growth inhibition (CDI) is a bacterial competition mechanism, wherein the C-terminal toxin domain of CdiA protein (CdiA-CT) is transferred from one bacterium to another, impeding the growth of the toxin recipient. In uropathogenic Escherichia coli 536, CdiA-CT (CdiA-CTEC536) is a tRNA anticodon endonuclease that requires a cysteine biogenesis factor, CysK, for its activity. However, the mechanism underlying tRNA recognition and cleavage by CdiA-CTEC536 remains unresolved. Here, we present the cryo-EM structure of the CysK:CdiA-CTEC536:tRNA ternary complex. The interaction between CdiA-CTEC536 and CysK stabilizes the CdiA-CTEC536 structure and facilitates tRNA binding and the formation of the CdiA-CTEC536 catalytic core structure. The bottom-half of the tRNA interacts exclusively with CdiA-CTEC536 and the α-helices of CdiA-CTEC536 engage with the minor and major grooves of the bottom-half of tRNA, positioning the tRNA anticodon loop at the CdiA-CTEC536 catalytic site for tRNA cleavage. Thus, CysK serves as a platform facilitating the recognition and cleavage of substrate tRNAs by CdiA-CTEC536. |
リンク | Nucleic Acids Res / PubMed:39228374 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.6 - 3.04 Å |
| 構造データ | EMDB-60561, PDB-8zyc: EMDB-60562, PDB-8zyd: ![]() EMDB-60563: Cryo-EM structure of uropathogenic Escherichia coli 2:1 CysK:CdiA complex ![]() EMDB-60564: Cryo-EM structure of uropathogenic Escherichia coli 2:2 CysK:CdiA complex |
| 化合物 | ![]() ChemComp-MG: |
| 由来 |
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キーワード | TOXIN / RNase / Complex / Contact-dependent growth inhibition |
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