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-Structure paper
タイトル | Cryo-EM structures reveal the molecular mechanism of HflX-mediated erythromycin resistance in mycobacteria. |
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ジャーナル・号・ページ | Structure, Vol. 32, Issue 9, Page 1443-11453.e4, Year 2024 |
掲載日 | 2024年9月5日 |
著者 | Krishnamoorthi Srinivasan / Aneek Banerjee / Jayati Sengupta / |
PubMed 要旨 | Mycobacterial HflX confers resistance against macrolide antibiotics. However, the exact molecular mechanism is poorly understood. To gain further insights, we determined the cryo-EM structures of M. ...Mycobacterial HflX confers resistance against macrolide antibiotics. However, the exact molecular mechanism is poorly understood. To gain further insights, we determined the cryo-EM structures of M. smegmatis (Msm) HflX-50S subunit and 50S subunit-erythromycin (ERY) complexes at a global resolution of approximately 3 Å. A conserved nucleotide A2286 at the gate of nascent peptide exit tunnel (NPET) adopts a swayed conformation in HflX-50S complex and interacts with a loop within the linker helical (LH) domain of MsmHflX that contains an additional 9 residues insertion. Interestingly, the swaying of this nucleotide, which is usually found in the non-swayed conformation, is induced by erythromycin binding. Furthermore, we observed that erythromycin decreases HflX's ribosome-dependent GTP hydrolysis, resulting in its enhanced binding and anti-association activity on the 50S subunit. Our findings reveal how mycobacterial HflX senses the presence of macrolides at the peptide tunnel entrance and confers antibiotic resistance in mycobacteria. |
リンク | Structure / PubMed:39029461 |
手法 | EM (単粒子) |
解像度 | 3.3 - 3.6 Å |
構造データ | EMDB-37007, PDB-8kab: EMDB-38788, PDB-8xz3: |
化合物 | ChemComp-GNP: ChemComp-ERY: |
由来 |
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キーワード | RIBOSOME / Complex / Antibiotic |