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-Structure paper
タイトル | Structural basis for antibiotic resistance mediated by the ABCF ATPase VmlR. |
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ジャーナル・号・ページ | Proc Natl Acad Sci U S A, Vol. 115, Issue 36, Page 8978-8983, Year 2018 |
掲載日 | 2018年9月4日 |
著者 | Caillan Crowe-McAuliffe / Michael Graf / Paul Huter / Hiraku Takada / Maha Abdelshahid / Jiří Nováček / Victoriia Murina / Gemma C Atkinson / Vasili Hauryliuk / Daniel N Wilson / |
PubMed 要旨 | Many Gram-positive pathogenic bacteria employ ribosomal protection proteins (RPPs) to confer resistance to clinically important antibiotics. In , the RPP VmlR confers resistance to lincomycin (Lnc) ...Many Gram-positive pathogenic bacteria employ ribosomal protection proteins (RPPs) to confer resistance to clinically important antibiotics. In , the RPP VmlR confers resistance to lincomycin (Lnc) and the streptogramin A (S) antibiotic virginiamycin M (VgM). VmlR is an ATP-binding cassette (ABC) protein of the F type, which, like other antibiotic resistance (ARE) ABCF proteins, is thought to bind to antibiotic-stalled ribosomes and promote dissociation of the drug from its binding site. To investigate the molecular mechanism by which VmlR confers antibiotic resistance, we have determined a cryo-electron microscopy (cryo-EM) structure of an ATPase-deficient VmlR-EQ mutant in complex with a ErmDL-stalled ribosomal complex (SRC). The structure reveals that VmlR binds within the E site of the ribosome, with the antibiotic resistance domain (ARD) reaching into the peptidyltransferase center (PTC) of the ribosome and a C-terminal extension (CTE) making contact with the small subunit (SSU). To access the PTC, VmlR induces a conformational change in the P-site tRNA, shifting the acceptor arm out of the PTC and relocating the CCA end of the P-site tRNA toward the A site. Together with microbiological analyses, our study indicates that VmlR allosterically dissociates the drug from its ribosomal binding site and exhibits specificity to dislodge VgM, Lnc, and the pleuromutilin tiamulin (Tia), but not chloramphenicol (Cam), linezolid (Lnz), nor the macrolide erythromycin (Ery). |
リンク | Proc Natl Acad Sci U S A / PubMed:30126986 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 3.1 - 3.5 Å |
構造データ | |
化合物 | ChemComp-TEL: ChemComp-ATP: |
由来 |
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キーワード | RIBOSOME / single particle cryo-EM / stalling peptide / telithromycin / ABCF / ATPase / antibiotic resistiance |