1QNL

AMIDE RECEPTOR/NEGATIVE REGULATOR OF THE AMIDASE OPERON OF PSEUDOMONAS AERUGINOSA (AMIC) COMPLEXED WITH BUTYRAMIDE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.314 
  • R-Value Work: 0.269 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Structural Adaptation to Selective Pressure for Altered Ligand Specificity in the Pseudomonas Aeruginosa Amide Receptor, Amic

O'Hara, B.P.Wilson, S.A.Lee, A.W.L.Roe, S.M.Siligardi, G.Drew, R.E.Pearl, L.H.

(2000) Protein Eng 13: 129

  • DOI: 10.1093/protein/13.2.129
  • Primary Citation of Related Structures:  
    1QNL

  • PubMed Abstract: 
  • The AmiC protein in Pseudomonas aeruginosa is the negative regulator and ligand receptor for an amide-inducible aliphatic amidase operon. In the wild-type PAC1 strain, amidase expression is induced by acetamide or lactamide, but not by butyramide. A mutant strain of P ...

    The AmiC protein in Pseudomonas aeruginosa is the negative regulator and ligand receptor for an amide-inducible aliphatic amidase operon. In the wild-type PAC1 strain, amidase expression is induced by acetamide or lactamide, but not by butyramide. A mutant strain of P. aeruginosa, PAC181, was selected for its sensitivity to induction by butyramide. The molecular basis for the butyramide inducible phenotype of P.aeruginosa PAC181 has now been determined, and results from a Thr-->Asn mutation at position 106 in PAC181-AmiC. In the wild-type PAC1-AmiC protein this residue forms part of the side wall of the amide-binding pocket but does not interact with the acetamide ligand directly. In the crystal structure of PAC181-AmiC complexed with butyramide, the Thr-->Asn mutation increases the size of the ligand binding site such that the mutant protein is able to close into its 'on' configuration even in the presence of butyramide. Although the mutation allows butyramide to be recognized as an inducer of amidase expression, the mutation is structurally sub-optimal, and produces a significant decrease in the stability of the mutant protein.


    Related Citations: 
    • Crystal Structure of Amic: The Controller of Transcription Antitermination in the Amidase Operon of Pseudomonas Aeruginosa
      Pearl, L.H., O'Hara, B.P., Drew, R.E., Wilson, S.A.
      (1994) EMBO J 13: 5810
    • Antitermination of Amidase Expression in Pseudomonas Aeruginosa is Controlled by a Novel Cytoplasmic Amide- Binding Protein
      Wilson, S.A., Wachira, S.J., Drew, R.E., Jones, D., Pearl, L.H.
      (1993) EMBO J 12: 3637
    • Crystallization and Preliminary X-Ray Data for the Negative Regulator (Amic) of the Amidase Operon of Pseudomonas Aeruginosa
      Wilson, S.A., Chayen, N.E., Hemmings, A.M., Drew, R.E., Pearl, L.H.
      (1991) J Mol Biol 222: 869

    Organizational Affiliation

    Department of Biochemistry and Molecular Biology and Joint UCL/LICR X-Ray Crystallography Laboratory, University College London, Gower Street, London WC1E 6BT, UK.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ALIPHATIC AMIDASE EXPRESSION-REGULATING PROTEINA385Pseudomonas aeruginosaMutation(s): 0 
UniProt
Find proteins for P27017 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore P27017 
Go to UniProtKB:  P27017
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP27017
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BMD
Query on BMD

Download Ideal Coordinates CCD File 
B [auth A]BUTYRAMIDE
C4 H9 N O
DNSISZSEWVHGLH-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.314 
  • R-Value Work: 0.269 
  • Space Group: P 42 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 104.15α = 90
b = 104.15β = 90
c = 65.68γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
AMoREphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-12-23
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-07-05
    Changes: Data collection
  • Version 1.4: 2019-05-08
    Changes: Data collection, Experimental preparation