Structure of E. coli AdiC (P1)

Experimental Data Snapshot

  • Resolution: 4.00 Å
  • R-Value Free: 0.331 
  • R-Value Work: 0.319 
  • R-Value Observed: 0.320 

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Structure and mechanism of an amino acid antiporter

Gao, X.Lu, F.Zhou, L.Dang, S.Sun, L.Li, X.Wang, J.Shi, Y.

(2009) Science 324: 1565-1568

  • DOI: https://doi.org/10.1126/science.1173654
  • Primary Citation of Related Structures:  
    3LRB, 3LRC

  • PubMed Abstract: 

    Virulent enteric pathogens such as Escherichia coli strain O157:H7 rely on acid-resistance (AR) systems to survive the acidic environment in the stomach. A major component of AR is an arginine-dependent arginine:agmatine antiporter that expels intracellular protons. Here, we report the crystal structure of AdiC, the arginine:agmatine antiporter from E. coli O157:H7 and a member of the amino acid/polyamine/organocation (APC) superfamily of transporters at 3.6 A resolution. The overall fold is similar to that of several Na+-coupled symporters. AdiC contains 12 transmembrane segments, forms a homodimer, and exists in an outward-facing, open conformation in the crystals. A conserved, acidic pocket opens to the periplasm. Structural and biochemical analysis reveals the essential ligand-binding residues, defines the transport route, and suggests a conserved mechanism for the antiporter activity.

  • Organizational Affiliation

    State Key Laboratory of Bio-membrane and Membrane Biotechnology, Tsinghua University, Beijing 100084, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Arginine/agmatine antiporter
A, B, C, D
445Escherichia coli O157:H7Mutation(s): 0 
Gene Names: adiCZ5717ECs5097
Membrane Entity: Yes 
Find proteins for P60063 (Escherichia coli O157:H7)
Explore P60063 
Go to UniProtKB:  P60063
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP60063
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 4.00 Å
  • R-Value Free: 0.331 
  • R-Value Work: 0.319 
  • R-Value Observed: 0.320 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 81.88α = 80.03
b = 111.67β = 74.34
c = 113.76γ = 68.83
Software Package:
Software NamePurpose
BSSdata collection
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-02-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-11-01
    Changes: Data collection, Database references, Refinement description