7Z6W

Complex of E. coli LolA and lipoprotein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.84 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.183 

Starting Model: experimental
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This is version 1.1 of the entry. See complete history


Literature

Structural basis of lipoprotein recognition by the bacterial Lol trafficking chaperone LolA.

Kaplan, E.Greene, N.P.Jepson, A.E.Koronakis, V.

(2022) Proc Natl Acad Sci U S A 119: e2208662119-e2208662119

  • DOI: https://doi.org/10.1073/pnas.2208662119
  • Primary Citation of Related Structures:  
    7Z6W, 7Z6X

  • PubMed Abstract: 

    In gram-negative bacteria, lipoproteins are vital structural components of the outer membrane (OM) and crucial elements of machineries central to the physiology of the cell envelope. A dedicated apparatus, the Lol system, is required for the correct localization of OM lipoproteins and is essential for viability. The periplasmic chaperone LolA is central to this trafficking pathway, accepting triacylated lipoproteins from the inner membrane transporter LolCDE, before carrying them across the periplasm to the OM receptor LolB. Here, we report a crystal structure of liganded LolA, generated in vivo, revealing the molecular details of lipoprotein association. The structure highlights how LolA, initially primed to receive lipoprotein by interaction with LolC, further opens to accommodate the three ligand acyl chains in a precise conformation within its cavity. LolA forms extensive interactions with the acyl chains but not with any residue of the cargo, explaining the chaperone's ability to transport structurally diverse lipoproteins. Structural characterization of a ligandedLolA variant incapable of lipoprotein release reveals aberrant association, demonstrating the importance of the LolCDE-coordinated, sequential opening of LolA for inserting lipoprotein in a manner productive for subsequent trafficking. Comparison with existing structures of LolA in complex with LolC or LolCDE reveals substantial overlap of the lipoprotein and LolC binding sites within the LolA cavity, demonstrating that insertion of lipoprotein acyl chains physically disengages the chaperone protein from the transporter by perturbing interaction with LolC. Taken together, our data provide a key step toward a complete understanding of a fundamentally important trafficking pathway.


  • Organizational Affiliation

    Department of Pathology, University of Cambridge, Cambridge CB2 1QP, United Kingdom.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Outer-membrane lipoprotein carrier protein192Escherichia coli K-12Mutation(s): 0 
Gene Names: lolAlplAyzzVb0891JW0874
UniProt
Find proteins for P61316 (Escherichia coli (strain K12))
Explore P61316 
Go to UniProtKB:  P61316
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP61316
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
IG7 (Subject of Investigation/LOI)
Query on IG7

Download Ideal Coordinates CCD File 
B [auth A][(2~{S})-3-[(2~{S})-3-azanyl-2-(hexadecanoylamino)-3-oxidanylidene-propyl]sulfanyl-2-hexadecanoyloxy-propyl] hexadecanoate
C54 H104 N2 O6 S
YHUVNRUCZVBSAB-LOYCUKJKSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.84 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.183 
  • Space Group: I 4
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 90.98α = 90
b = 90.98β = 90
c = 47.56γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
Aimlessdata scaling
PDB_EXTRACTdata extraction
iMOSFLMdata reduction
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Medical Research Council (MRC, United Kingdom)United KingdomMR/N000994/1
Medical Research Council (MRC, United Kingdom)United KingdomMR/V000616/1

Revision History  (Full details and data files)

  • Version 1.0: 2022-09-07
    Type: Initial release
  • Version 1.1: 2024-01-31
    Changes: Data collection, Refinement description