Crystal structure of the peptidase-containing ABC transporter PCAT1

Experimental Data Snapshot

  • Resolution: 3.61 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.266 
  • R-Value Observed: 0.267 

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Crystal structures of a polypeptide processing and secretion transporter.

Lin, D.Y.Huang, S.Chen, J.

(2015) Nature 523: 425-430

  • DOI: https://doi.org/10.1038/nature14623
  • Primary Citation of Related Structures:  
    4RY2, 4S0F

  • PubMed Abstract: 

    Bacteria secrete peptides and proteins to communicate, to poison competitors, and to manipulate host cells. Among the various protein-translocation machineries, the peptidase-containing ATP-binding cassette transporters (PCATs) are appealingly simple. Each PCAT contains two peptidase domains that cleave the secretion signal from the substrate, two transmembrane domains that form a translocation pathway, and two nucleotide-binding domains that hydrolyse ATP. In Gram-positive bacteria, PCATs function both as maturation proteases and exporters for quorum-sensing or antimicrobial polypeptides. In Gram-negative bacteria, PCATs interact with two other membrane proteins to form the type 1 secretion system. Here we present crystal structures of PCAT1 from Clostridium thermocellum in two different conformations. These structures, accompanied by biochemical data, show that the translocation pathway is a large α-helical barrel sufficient to accommodate small folded proteins. ATP binding alternates access to the transmembrane pathway and also regulates the protease activity, thereby coupling substrate processing to translocation.

  • Organizational Affiliation

    1] Laboratory of Membrane Biology and Biophysics, The Rockefeller University, 1230 York Avenue, New York, New York 10065, USA [2] Howard Hughes Medical Institute, 1230 York Avenue, New York, New York 10065, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ABC-type bacteriocin transporter
A, B
730Acetivibrio thermocellus ATCC 27405Mutation(s): 0 
Gene Names: ABN51770.1Cthe_0534
EC: 3.4.22
Membrane Entity: Yes 
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
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.61 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.266 
  • R-Value Observed: 0.267 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.59α = 90
b = 89.73β = 90
c = 296.59γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-07-22
    Type: Initial release
  • Version 1.1: 2015-08-05
    Changes: Database references
  • Version 1.2: 2023-09-20
    Changes: Data collection, Database references, Refinement description