7CH9

Cryo-EM structure of P.aeruginosa MlaFEBD


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 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

Structural Insight into Phospholipid Transport by the MlaFEBD Complex from P. aeruginosa.

Zhou, C.Shi, H.Zhang, M.Zhou, L.Xiao, L.Feng, S.Im, W.Zhou, M.Zhang, X.Huang, Y.

(2021) J Mol Biol 433: 166986-166986

  • DOI: https://doi.org/10.1016/j.jmb.2021.166986
  • Primary Citation of Related Structures:  
    7CH6, 7CH7, 7CH8, 7CH9, 7CHA

  • PubMed Abstract: 

    The outer membrane (OM) of Gram-negative bacteria, which consists of lipopolysaccharides (LPS) in the outer leaflet and phospholipids (PLs) in the inner leaflet, plays a key role in antibiotic resistance and pathogen virulence. The maintenance of lipid asymmetry (Mla) pathway is known to be involved in PL transport and contributes to the lipid homeostasis of the OM, yet the underlying molecular mechanism and the directionality of PL transport in this pathway remain elusive. Here, we reported the cryo-EM structures of the ATP-binding cassette (ABC) transporter MlaFEBD from P. areuginosa, the core complex in the Mla pathway, in nucleotide-free (apo)-, ADP (ATP + vanadate)- and ATP (AMPPNP)-bound states as well as the structures of MlaFEB from E. coli in apo- and AMPPNP-bound states at a resolution range of 3.4-3.9 Å. The structures show that the MlaFEBD complex contains a total of twelve protein molecules with a stoichiometry of MlaF 2 E 2 B 2 D 6 , and binds a plethora of PLs at different locations. In contrast to canonical ABC transporters, nucleotide binding fails to trigger significant conformational changes of both MlaFEBD and MlaFEB in the nucleotide-binding and transmembrane domains of the ABC transporter, correlated with their low ATPase activities exhibited in both detergent micelles and lipid nanodiscs. Intriguingly, PLs or detergents appeared to relocate to the membrane-proximal end from the distal end of the hydrophobic tunnel formed by the MlaD hexamer in MlaFEBD upon addition of ATP, indicating that retrograde PL transport might occur in the tunnel in an ATP-dependent manner. Site-specific photocrosslinking experiment confirms that the substrate-binding pocket in the dimeric MlaE and the MlaD hexamer are able to bind PLs in vitro, in line with the notion that MlaFEBD complex functions as a PL transporter.


  • Organizational Affiliation

    National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Chaoyang District, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing100101, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
MlaD domain-containing protein
A, B, C, D, E
A, B, C, D, E, F
157Pseudomonas aeruginosa PAO1Mutation(s): 0 
Gene Names: PA4454
UniProt
Find proteins for Q9HVW3 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9HVW3 
Go to UniProtKB:  Q9HVW3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9HVW3
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Probable permease of ABC transporter
G, H
265Pseudomonas aeruginosa PAO1Mutation(s): 0 
Gene Names: PA4455
Membrane Entity: Yes 
UniProt
Find proteins for Q9HVW2 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9HVW2 
Go to UniProtKB:  Q9HVW2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9HVW2
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Probable ATP-binding component of ABC transporter
I, J
269Pseudomonas aeruginosa PAO1Mutation(s): 0 
Gene Names: PA4456
UniProt
Find proteins for Q9HVW1 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9HVW1 
Go to UniProtKB:  Q9HVW1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9HVW1
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  • Reference Sequence
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
STAS domain-containing protein
K, L
102Pseudomonas aeruginosa PAO1Mutation(s): 0 
Gene Names: PA4452
UniProt
Find proteins for Q9HVW5 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9HVW5 
Go to UniProtKB:  Q9HVW5
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UniProt GroupQ9HVW5
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
LPP (Subject of Investigation/LOI)
Query on LPP

Download Ideal Coordinates CCD File 
M [auth A]
N [auth B]
O [auth B]
P [auth C]
Q [auth C]
M [auth A],
N [auth B],
O [auth B],
P [auth C],
Q [auth C],
R [auth E],
S [auth F],
T [auth G],
U [auth G],
V [auth H]
2-(HEXADECANOYLOXY)-1-[(PHOSPHONOOXY)METHYL]ETHYL HEXADECANOATE
C35 H69 O8 P
PORPENFLTBBHSG-MGBGTMOVSA-N
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION3.0

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China--

Revision History  (Full details and data files)

  • Version 1.0: 2021-10-06
    Type: Initial release
  • Version 1.1: 2024-05-29
    Changes: Data collection