3BRQ | pdb_00003brq

Crystal structure of the Escherichia coli transcriptional repressor ascG

• PDB DOI: https://doi.org/10.2210/pdb3BRQ/pdb

• Classification: TRANSCRIPTION REGULATOR
• Organism(s): Escherichia coli K-12
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2007-12-21 Released: 2008-01-22 
• Deposition Author(s): Singer, A.U., Kagan, O., Evdokimova, E., Osipiuk, J., Joachimiak, A., Edwards, A.M., Savchenko, A., Midwest Center for Structural Genomics (MCSG)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 
  0.249 (Depositor), 0.256 (DCC) 
• R-Value Work: 
  0.186 (Depositor), 0.194 (DCC) 
• R-Value Observed: 
  0.189 (Depositor) 

Literature

Structure of the E. coli transcriptional repressor ascG.

Singer, A.U., Kagan, O., Evdokimova, E., Osipiuk, J., Edwards, A.M., Joachimiak, A., Savchenko, A.

To be published.

Biological Assembly 1  

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

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

Macromolecule Content 

• Total Structure Weight: 66.22 kDa 
• Atom Count: 4,606 
• Modeled Residue Count: 548 
• Deposited Residue Count: 592 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
HTH-type transcriptional regulator ascG	A, B	296	Escherichia coli K-12	Mutation(s): 0  Gene Names: ascG, b2714, JW5434
UniProt
Find proteins for P24242 (Escherichia coli (strain K12)) Explore P24242  Go to UniProtKB:  P24242

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
FRU	C [auth A]	beta-D-fructofuranose C6 H12 O6 RFSUNEUAIZKAJO-ARQDHWQXSA-N
SO4	D [auth A], F [auth B]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
NA	E [auth B]	SODIUM ION Na FKNQFGJONOIPTF-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MSE	A, B	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free:  0.249 (Depositor), 0.256 (DCC) 
• R-Value Work:  0.186 (Depositor), 0.194 (DCC) 
• R-Value Observed: 0.189 (Depositor) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 62.229	α = 90
b = 65.446	β = 90
c = 130.706	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
ADSC	data collection
HKL-2000	data reduction
HKL-2000	data scaling
HKL-3000	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2008-01-22 
Deposition Author(s): Singer, A.U., Kagan, O., Evdokimova, E., Osipiuk, J., Joachimiak, A., Edwards, A.M., Savchenko, A., Midwest Center for Structural Genomics (MCSG)

Revision History  

• Version 1.0: 2008-01-22
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Source and taxonomy, Version format compliance
• Version 1.2: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Data collection, Database references, Derived calculations, Structure summary
• Version 1.3: 2024-11-13
  Changes: Data collection, Database references, Structure summary