7K8A

CryoEM structure of a trehalose monomycolate transporter in lipid nanodiscs


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.65 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structures of the mycobacterial membrane protein MmpL3 reveal its mechanism of lipid transport.

Su, C.C.Klenotic, P.A.Cui, M.Lyu, M.Morgan, C.E.Yu, E.W.

(2021) PLoS Biol 19: e3001370-e3001370

  • DOI: https://doi.org/10.1371/journal.pbio.3001370
  • Primary Citation of Related Structures:  
    7K7M, 7K8A, 7K8B, 7K8C, 7K8D, 7N6B

  • PubMed 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.


  • Organizational Affiliation

    Department of Pharmacology, Case Western Reserve University School of Medicine, Cleveland, Ohio, United States of America.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Drug exporters of the RND superfamily-like protein1,019Mycolicibacterium smegmatis MC2 155Mutation(s): 0 
Gene Names: mmpL3MSMEI_0243
Membrane Entity: Yes 
UniProt
Find proteins for A0QP27 (Mycolicibacterium smegmatis (strain ATCC 700084 / mc(2)155))
Explore A0QP27 
Go to UniProtKB:  A0QP27
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0QP27
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.65 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data

  • Released Date: 2021-09-22 
  • Deposition Author(s): Su, C.-C.

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2021-09-22
    Type: Initial release
  • Version 1.1: 2024-05-29
    Changes: Data collection