Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 23.42 kDa 
• Atom Count: 1558 
• Modelled Residue Count: 198 
• Deposited Residue Count: 208 
• Unique protein chains: 1

1ZN2

Low Resolution Structure of Response Regulator StyR

• PDB DOI: 10.2210/pdb1ZN2/pdb

• Classification: transcription regulator
• Organism(s): Pseudomonas fluorescens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2005-05-11 Released: 2005-09-27 
• Deposition Author(s): Milani, M., Leoni, L., Rampioni, G., Zennaro, E., Ascenzi, P., Bolognesi, M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.91 Å
• R-Value Free: 0.352 
• R-Value Work: 0.265 
• R-Value Observed: 0.269 

Literature

An Active-like Structure in the Unphosphorylated StyR Response Regulator Suggests a Phosphorylation- Dependent Allosteric Activation Mechanism.

Milani, M., Leoni, L., Rampioni, G., Zennaro, E., Ascenzi, P., Bolognesi, M.

(2005) Structure 13: 1289-1297

• PubMed: 16154086 
• DOI: 10.1016/j.str.2005.05.014
• Primary Citation of Related Structures:  
  1YIO, 1ZN2


• PubMed Abstract: 
  

StyR belongs to the FixJ subfamily of signal transduction response regulators; it controls transcription of the styABCD operon coding for styrene catabolism in Pseudomonas fluorescens ST. The crystal structure of unphosphorylated StyR is reported at 2.2 A resolution. StyR is composed of an N-terminal regulatory domain (StyR-N) and a C-terminal DNA binding domain (StyR-C). The two domains are separated by an elongated linker alpha helix (34 residues), a new feature in known response regulator structures. StyR-C is structured similarly to the DNA binding domain of the response regulator NarL. StyR-N shows structural reorganization of the phosphate receiving region involved in activation/homodimerization: specific residues adopt an "active-like" conformation, and the alpha4 helix, involved in dimerization of the homologous FixJ response regulator, is trimmed to just one helical turn. Overall, structural considerations suggest that phosphorylation may act as an allosteric switch, shifting a preexisting StyR equilibrium toward the active, dimeric, DNA binding form.

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Organizational Affiliation: 

Giannina Gaslini Institute and INFM, Largo G. Gaslini 5, I-16147 Genova, Italy.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
response regulatory protein	A	208	Pseudomonas fluorescens	Mutation(s): 0  Gene Names: styR
UniProt
Find proteins for O30989 (Pseudomonas fluorescens) Explore O30989  Go to UniProtKB:  O30989

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
MG	B [auth A]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.91 Å
• R-Value Free: 0.352 
• R-Value Work: 0.265 
• R-Value Observed: 0.269 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 41.66	α = 90
b = 36.546	β = 100.32
c = 75.12	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling
MOLREP	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2005-05-11 
• Released Date: 2005-09-27 
Deposition Author(s): Milani, M., Leoni, L., Rampioni, G., Zennaro, E., Ascenzi, P., Bolognesi, M.

Revision History  

• Version 1.0: 2005-09-27
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance