Download MendeleyAssembly and inhibition of transferable TMexCD1-TOprJ1 efflux pump.
Shi, Y., Li, M., Cui, T., Gan, J., Huang, H., Su, Z., Yang, R., Zhang, X., Zhang, H., Feng, Y., Feng, Y.(2025) Nat Commun 16: 10025-10025
- PubMed: 41238543
- DOI: https://doi.org/10.1038/s41467-025-65038-x
- Primary Citation of Related Structures:
9J3D, 9J3E - PubMed Abstract:
Recent emergence and dissemination of plasmid-borne tmexCD1-toprJ1 tigecycline resistance threatens the efficacy of tigecycline as a "last-resort" defense against bacterial infections. Here, we report two cryo-EM structures of TMexCD1-TOprJ1 alone and in complex with its NMP inhibitor, and both are determined at the resolutions of 2.97 Å and 3.0 Å, respectively. The symmetry of overall architecture explains how the tripartite organization adopts a 3:6:3 protomer stoichiometry (TOprJ1: TMexC1: TMexD1) to assemble an elongated, rod-like pump spanning bacterial double membranes. The periplasmic TMexC1 adaptor bind the trimeric TOprJ1 funnel via a universal "tip-to-tip" contact, and bridges the bottom TMexD1 engine by extensive interactions. A unique form of resting (R) states is observed for TMexD1 trimer. Besides two binding-interfaces of TMexC1 with TOprJ1 and TMexD1, we characterize a substrate/inhibitor-loading cavity. Collectively, these findings constitute molecular bases for assembly and inhibition of transferable TMexCD1-TOprJ1 machinery, and benefit developing next-generation of antimicrobials targeting functional efflux pump.
- Department of General Intensive Care Unit of the Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.
Organizational Affiliation:
