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-Structure paper
| タイトル | Structural basis of siderophore export and drug efflux by Mycobacterium tuberculosis. |
|---|---|
| ジャーナル・号・ページ | Nat Commun, Vol. 16, Issue 1, Page 1934, Year 2025 |
| 掲載日 | 2025年2月24日 |
著者 | Jennifer C Earp / Alisa A Garaeva / Virginia Meikle / Michael Niederweis / Markus A Seeger / ![]() |
| PubMed 要旨 | To replicate and cause disease, Mycobacterium tuberculosis secretes siderophores called mycobactins to scavenge iron from the human host. Two closely related transporters, MmpL4 and MmpL5, are ...To replicate and cause disease, Mycobacterium tuberculosis secretes siderophores called mycobactins to scavenge iron from the human host. Two closely related transporters, MmpL4 and MmpL5, are required for mycobactin secretion and drug efflux. In clinical strains, overproduction of MmpL5 confers resistance towards bedaquiline and clofazimine, key drugs to combat multidrug resistant tuberculosis. Here, we present cryogenic-electron microscopy structures of MmpL4 and identify a mycobactin binding site, which is accessible from the cytosol and also required for bedaquiline efflux. An unusual coiled-coil domain predicted to extend 130 Å into the periplasm is essential for mycobactin and bedaquiline efflux by MmpL4 and MmpL5. The mycobacterial acyl carrier protein MbtL forms a complex with MmpL4, indicating that mycobactin synthesis and export are coupled. Thus, MmpL4 and MmpL5 constitute the core components of a unique multi-subunit machinery required for iron acquisition and drug efflux by M. tuberculosis. |
リンク | Nat Commun / PubMed:39994240 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.0 - 6.3 Å |
| 構造データ | EMDB-51366, PDB-9gi0: EMDB-51368, PDB-9gi2: EMDB-51369, PDB-9gi3: ![]() EMDB-51370: Full-length MmpL4 in complex with the synthetic nanobody Sb09 and the E. coli acyl carrier protein ![]() EMDB-51371: Truncated MmpL4 mutant R375E/R383E. |
| 化合物 | ![]() ChemComp-PEE: ![]() PDB-1il5: |
| 由来 |
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キーワード | MEMBRANE PROTEIN / RND superfamily MmpL family Siderophore export Drug resistance Acyl carrier protein |
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