Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 67855.04 
• Atom Count: 4536 
• Residue Count: 610 
• Unique protein chains: 1

3FXQ

Crystal structure of the LysR-type transcriptional regulator TsaR

• DOI: 10.2210/pdb3FXQ/pdb

• Classification: Transcription regulator
• Organism(s): Comamonas testosteroni
• Expression System: Escherichia coli


• Deposited: 2009-01-21 Released: 2010-01-26 
• Deposition Author(s): Monferrer, D., Tralau, T., Kertesz, M.A., Kikhney, A., Svergun, D., Uson, I.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.85 Å
• R-Value Free: 0.213 
• R-Value Work: 0.180 

Literature

Structural studies on the full-length LysR-type regulator TsaR from Comamonas testosteroni T-2 reveal a novel open conformation of the tetrameric LTTR fold

Monferrer, D., Tralau, T., Kertesz, M.A., Dix, I., Sola, M., Uson, I.

(2010) Mol.Microbiol. 75: 1199-1214

• PubMed: 20059681 
• DOI: 10.1111/j.1365-2958.2010.07043.x
• Primary Citation of Related Structures:  
  3FZJ, 3FXU, 3FXR


• PubMed Abstract: 
  

LysR-type transcriptional regulators (LTTRs) constitute the largest family of regulators in prokaryotes. The full-length structures of the LTTR TsaR from Comamonas testosteroni T-2 and its complex with the natural inducer para-toluensulfonate have been characterized by X-ray diffraction. Both ligand-free and complexed forms reveal a dramatically different quaternary structure from that of CbnR from Ralstonia eutropha, or a putative LysR-type regulator from Pseudomonas aeruginosa, the only other determined full-length structures of tetrameric LTTRs. Although all three show a head-to-head tetrameric ring, TsaR displays an open conformation, whereas CbnR and PA01-PR present additional contacts in opposing C-terminal domains that close the ring. Such large differences may be due to a broader structural versatility than previously assumed or either, reflect the intrinsic flexibility of tetrameric LTTRs. On the grounds of the sliding dimer hypothesis of LTTR activation, we propose a structural model in which the closed structures could reflect the conformation of a ligand-free LTTR, whereas inducer binding would bring about local changes to disrupt the interface linking the two compact C-terminal domains. This could lead to a TsaR-like, open structure, where the pairs of recognition helices are closer to each other by more than 10 A.

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Related Citations: 

• High crystallizability under air-exclusion conditions of the full-length LysR-type transcriptional regulator TsaR from Comamonas testosteroni T-2 and data-set analysis for a MIRAS structure-solution approach
  Monferrer, D.,Tralau, T.,Kertesz, M.A.,Panjikar, S.,Uson, I.
  (2008) Acta Crystallogr.,Sect.F 64: 764




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Organizational Affiliation: 

IBMB-CSIC, Baldiri Reixach 15, Barcelona Science Park, 08028, Barcelona, Spain.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
LysR type regulator of tsaMBCD	A, B	305	Comamonas testosteroni	Mutation(s): 0  Gene Names: tsaR
Find proteins for P94678 (Comamonas testosteroni) Go to UniProtKB:  P94678

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
FMT	A	FORMIC ACID C H2 O2 BDAGIHXWWSANSR-UHFFFAOYSA-N
CL	A, B	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M
GOL	A	GLYCEROL GLYCERIN; PROPANE-1,2,3-TRIOL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N
BME	A, B	BETA-MERCAPTOETHANOL C2 H6 O S DGVVWUTYPXICAM-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.85 Å
• R-Value Free: 0.213 
• R-Value Work: 0.180 
• Space Group: C 1 2 1

Unit Cell:

Length (Å)	Angle (°)
a = 136.496	α = 90.00
b = 51.489	β = 110.35
c = 107.754	γ = 90.00

Software Package:

Software Name	Purpose
PDB_EXTRACT	data extraction
XSCALE	data scaling
XDS	data reduction
SADABS	data scaling
SHARP	phasing
RESOLVE	phasing
PROTEUM PLUS	data collection
REFMAC	refinement
PROTEUM	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2009-01-21 
• Released Date: 2010-01-26 
• Deposition Author(s): Monferrer, D., Tralau, T., Kertesz, M.A., Kikhney, A., Svergun, D., Uson, I.

Revision History 

• Version 1.0: 2010-01-26
  Type: Initial release
• Version 1.1: 2011-07-13
  Type: Advisory, Version format compliance
• Version 1.2: 2017-11-01
  Type: Refinement description