1PEA | pdb_00001pea

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

• PDB DOI: https://doi.org/10.2210/pdb1PEA/pdb

• Classification: BINDING PROTEIN
• Organism(s): Pseudomonas aeruginosa
• Expression System: Pseudomonas aeruginosa
• Mutation(s): No 


• Deposited: 1995-11-16 Released: 1996-04-03 
• Deposition Author(s): Pearl, L.H., O'Hara, B.P.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Free: 
  0.275 (Depositor) 
• R-Value Work: 
  0.206 (Depositor) 
• R-Value Observed: 
  0.206 (Depositor) 

Literature

Crystal structure of AmiC: the controller of transcription antitermination in the amidase operon of Pseudomonas aeruginosa.

Pearl, L., O'Hara, B., Drew, R., Wilson, S.

(1994) EMBO J 13: 5810-5817

• PubMed: 7813419 
• DOI: https://doi.org/10.1002/j.1460-2075.1994.tb06924.x
• Primary Citation Related Structures: 
  1PEA


• PubMed Abstract: 
  

  The crystal structure for the negative regulator (AmiC) of the amidase operon from Pseudomonas aeruginosa has been solved at a resolution of 2.1 A. AmiC is the amide sensor protein in the amidase operon and regulates the activity of the transcription antitermination factor AmiR, which in turn regulates amidase expression. The AmiC structure consists of two domains with an alternating beta-alpha-beta topology. The two domains are separated by a central cleft and the amide binding site is positioned in this cleft at the interface of the domains. The overall fold for AmiC is extremely similar to that for the leucine-isoleucine-valine binding protein (LivJ) of Escherichia coli despite only 17% sequence identity, however, the two domains of AmiC are substantially closed compared with LivJ. The closed structure of AmiC is stabilized significantly by the bound acetamide, suggesting a molecular mechanism for the process of amide induction. The amide binding site is extremely specific for acetamide and would not allow a closed conformation in the presence of the anti-inducer molecule butyramide.

---

Organizational Affiliation: 
• Department of Biochemistry and Molecular Biology, University College London, UK.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 43.02 kDa 
• Atom Count: 3,044 
• Modeled Residue Count: 368 
• Deposited Residue Count: 385 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
AMIDASE OPERON	A	385	Pseudomonas aeruginosa	Mutation(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

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ACM	B [auth A]	ACETAMIDE C2 H5 N O DLFVBJFMPXGRIB-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Free:  0.275 (Depositor) 
• R-Value Work:  0.206 (Depositor) 
• R-Value Observed: 0.206 (Depositor) 

Space Group: P 4₂ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 104.96	α = 90
b = 104.96	β = 90
c = 65.8	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
MOSFLM	data reduction
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1996-04-03 
Deposition Author(s): Pearl, L.H., O'Hara, B.P.

Revision History  

• Version 1.0: 1996-04-03
  Type: Initial release
  
• Version 1.1: 2008-03-03
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2024-02-14
  Changes: Data collection, Database references, Derived calculations, Other