9B46 | pdb_00009b46

Mycolicibacterium smegmatis MmpL5 structure

• PDB DOI: https://doi.org/10.2210/pdb9B46/pdb
• EM Map EMD-44171: EMDB EMDataResource

• Classification: TRANSPORT PROTEIN
• Organism(s): Mycolicibacterium smegmatis
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 
• Membrane Protein: Yes  PDBTM


• Deposited: 2024-03-20 Released: 2024-10-02 
• Deposition Author(s): Maharjan, R., Klenotic, P.A., Zhang, Z., Yu, E.W.
• Funding Organization(s): National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.00 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Structures of the mycobacterial MmpL4 and MmpL5 transporters provide insights into their role in siderophore export and iron acquisition.

Maharjan, R., Zhang, Z., Klenotic, P.A., Gregor, W.D., Tringides, M.L., Cui, M., Purdy, G.E., Yu, E.W.

(2024) PLoS Biol 22: e3002874-e3002874

• PubMed: 39423221 
• DOI: https://doi.org/10.1371/journal.pbio.3002874
• Primary Citation Related Structures: 
  9B43, 9B46, 9DP6


• PubMed Abstract: 
  

  The Mycobacterium tuberculosis (Mtb) pathogen, the causative agent of the airborne infection tuberculosis (TB), harbors a number of mycobacterial membrane protein large (MmpL) transporters. These membrane proteins can be separated into 2 distinct subclasses, where they perform important functional roles, and thus, are considered potential drug targets to combat TB. Previously, we reported both X-ray and cryo-EM structures of the MmpL3 transporter, providing high-resolution structural information for this subclass of the MmpL proteins. Currently, there is no structural information available for the subclass associated with MmpL4 and MmpL5, transporters that play a critical role in iron homeostasis of the bacterium. Here, we report cryo-EM structures of the M. smegmatis MmpL4 and MmpL5 transporters to resolutions of 2.95 Å and 3.00 Å, respectively. These structures allow us to propose a plausible pathway for siderophore translocation via these 2 transporters, an essential step for iron acquisition that enables the survival and replication of the mycobacterium.

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Organizational Affiliation: 
• Department of Pharmacology, Case Western Reserve University School of Medicine, Cleveland, Ohio, United States of America.
Department of Pharmaceutical Sciences, Northeastern University School of Pharmacy, Boston, Massachusetts, United States of America.
Department of Molecular Microbiology and Immunology, Oregon Health and Science University, Portland, Oregon, United States of America.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by (software)

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 106.43 kDa 
• Atom Count: 5,485 
• Modeled Residue Count: 726 
• Deposited Residue Count: 973 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
MmpL5 protein	A	973	Mycolicibacterium smegmatis	Mutation(s): 0  Gene Names: MSMEG_1382 Membrane Entity: Yes
UniProt
Find proteins for A0A653FL90 (Mycolicibacterium smegmatis) Explore A0A653FL90  Go to UniProtKB:  A0A653FL90

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.00 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2024-10-02 
Deposition Author(s): Maharjan, R., Klenotic, P.A., Zhang, Z., Yu, E.W.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)	United States	R01AI145069

Revision History  

• Version 1.0: 2024-10-02
  Type: Initial release
  
• Version 1.1: 2025-03-05
  Changes: Data collection, Database references, Structure summary