Structures of the mycobacterial membrane protein MmpL3 reveal its mechanism of lipid transport
Abstract
The mycobacterial membrane protein large 3 (MmpL3) transporter is essential and required for shuttling the lipid trehalose monomycolate (TMM), a precursor of mycolic acid (MA)-containing trehalose dimycolate (TDM) and mycolyl arabinogalactan peptidoglycan (mAGP), in Mycobacterium species, including Mycobacterium tuberculosis and Mycobacterium smegmatis. However, the mechanism that MmpL3 uses to facilitate the transport of fatty acids and lipidic elements to the mycobacterial cell wall remains elusive. Here, we report 7 structures of the M. smegmatis MmpL3 transporter in its unbound state and in complex with trehalose 6-decanoate (T6D) or TMM using single-particle cryo-electron microscopy (cryo-EM) and X-ray crystallography. Combined with calculated results from molecular dynamics (MD) and target MD simulations, we reveal a lipid transport mechanism that involves a coupled movement of the periplasmic domain and transmembrane helices of the MmpL3 transporter that facilitates the shuttling of lipids to the mycobacterial cell wall.
- Authors:
-
- Case Western Reserve University, Cleveland, OH (United States)
- Northeastern University, Boston, MA (United States)
- Publication Date:
- Research Org.:
- Case Western Reserve Univ., Cleveland, OH (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER); National Institutes of Health (NIH); National Cancer Institute (NCI)
- OSTI Identifier:
- 1903928
- Grant/Contract Number:
- AC05-76RL01830; R01AI145069; HSSN261200800001E; U24GM129547
- Resource Type:
- Accepted Manuscript
- Journal Name:
- PLoS Biology (Online)
- Additional Journal Information:
- Journal Name: PLoS Biology (Online); Journal Volume: 19; Journal Issue: 8; Journal ID: ISSN 1545-7885
- Publisher:
- Public Library of Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 60 APPLIED LIFE SCIENCES; electron cryo-microscopy; lipids; membrane proteins; mycobacterium tuberculosis; fungal structure; molecular dynamics; trehalose; crystal structure
Citation Formats
Su, Chih-Chia, Klenotic, Philip A., Cui, Meng, Lyu, Meinan, Morgan, Christopher E., and Yu, Edward W. Structures of the mycobacterial membrane protein MmpL3 reveal its mechanism of lipid transport. United States: N. p., 2021.
Web. doi:10.1371/journal.pbio.3001370.
Su, Chih-Chia, Klenotic, Philip A., Cui, Meng, Lyu, Meinan, Morgan, Christopher E., & Yu, Edward W. Structures of the mycobacterial membrane protein MmpL3 reveal its mechanism of lipid transport. United States. https://doi.org/10.1371/journal.pbio.3001370
Su, Chih-Chia, Klenotic, Philip A., Cui, Meng, Lyu, Meinan, Morgan, Christopher E., and Yu, Edward W. Thu .
"Structures of the mycobacterial membrane protein MmpL3 reveal its mechanism of lipid transport". United States. https://doi.org/10.1371/journal.pbio.3001370. https://www.osti.gov/servlets/purl/1903928.
@article{osti_1903928,
title = {Structures of the mycobacterial membrane protein MmpL3 reveal its mechanism of lipid transport},
author = {Su, Chih-Chia and Klenotic, Philip A. and Cui, Meng and Lyu, Meinan and Morgan, Christopher E. and Yu, Edward W.},
abstractNote = {The mycobacterial membrane protein large 3 (MmpL3) transporter is essential and required for shuttling the lipid trehalose monomycolate (TMM), a precursor of mycolic acid (MA)-containing trehalose dimycolate (TDM) and mycolyl arabinogalactan peptidoglycan (mAGP), in Mycobacterium species, including Mycobacterium tuberculosis and Mycobacterium smegmatis. However, the mechanism that MmpL3 uses to facilitate the transport of fatty acids and lipidic elements to the mycobacterial cell wall remains elusive. Here, we report 7 structures of the M. smegmatis MmpL3 transporter in its unbound state and in complex with trehalose 6-decanoate (T6D) or TMM using single-particle cryo-electron microscopy (cryo-EM) and X-ray crystallography. Combined with calculated results from molecular dynamics (MD) and target MD simulations, we reveal a lipid transport mechanism that involves a coupled movement of the periplasmic domain and transmembrane helices of the MmpL3 transporter that facilitates the shuttling of lipids to the mycobacterial cell wall.},
doi = {10.1371/journal.pbio.3001370},
journal = {PLoS Biology (Online)},
number = 8,
volume = 19,
place = {United States},
year = {Thu Aug 12 00:00:00 EDT 2021},
month = {Thu Aug 12 00:00:00 EDT 2021}
}
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