8VOX

Cryo-EM structure of the ABC transporter PCAT1 cysteine-free core bound with MgADP


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.07 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history


Literature

Conformational cycle of a protease-containing ABC transporter in lipid nanodiscs reveals the mechanism of cargo-protein coupling.

Zhang, R.Jagessar, K.L.Brownd, M.Polasa, A.Stein, R.A.Moradi, M.Karakas, E.Mchaourab, H.S.

(2024) Nat Commun 15: 9055-9055

  • DOI: https://doi.org/10.1038/s41467-024-53420-0
  • Primary Citation of Related Structures:  
    8VOW, 8VOX, 8VOZ, 8VP1, 8VP3, 8VP5, 8VP6, 8VP8, 8VP9, 8VPA, 8VPB, 9AZL, 9BAA

  • PubMed Abstract: 

    Protease-containing ABC transporters (PCATs) couple the energy of ATP hydrolysis to the processing and export of diverse cargo proteins across cell membranes to mediate antimicrobial resistance and quorum sensing. Here, we combine biochemical analysis, single particle cryoEM, and DEER spectroscopy in lipid bilayers along with computational analysis to illuminate the structural and energetic underpinnings of coupled cargo protein export. Our integrated investigation uncovers competitive interplay between nucleotides and cargo protein binding that ensures the latter's orderly processing and subsequent transport. The energetics of cryoEM structures in lipid bilayers are congruent with the inferred mechanism from ATP turnover analysis and reveal a snapshot of a high-energy outward-facing conformation that provides an exit pathway into the lipid bilayer and/or the extracellular side. DEER investigation of the core ABC transporter suggests evolutionary tuning of the energetic landscape to fulfill the function of substrate processing prior to export.


  • Organizational Affiliation

    Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ABC-type bacteriocin transporter
A, B
601Acetivibrio thermocellus ATCC 27405Mutation(s): 4 
UniProt
Find proteins for A3DCU1 (Acetivibrio thermocellus (strain ATCC 27405 / DSM 1237 / JCM 9322 / NBRC 103400 / NCIMB 10682 / NRRL B-4536 / VPI 7372))
Explore A3DCU1 
Go to UniProtKB:  A3DCU1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA3DCU1
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.07 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTPHENIX1.20.1-4487
RECONSTRUCTIONcryoSPARC4.2.1

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01 128087

Revision History  (Full details and data files)

  • Version 1.0: 2024-10-30
    Type: Initial release