2HSG

Structure of transcription regulator CcpA in its DNA-free state

• PDB DOI: https://doi.org/10.2210/pdb2HSG/pdb

• Classification: TRANSCRIPTION REGULATOR
• Organism(s): Priestia megaterium
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2006-07-21 Released: 2007-06-05 
• Deposition Author(s): Loll, B., Alings, C., Saenger, W., Biesiadka, J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 
  0.337 (Depositor), 0.340 (DCC) 
• R-Value Work: 
  0.271 (Depositor), 0.270 (DCC) 
• R-Value Observed: 
  0.281 (Depositor) 

Starting Model: experimental

Literature

Structure of full-length transcription regulator CcpA in the apo form.

Loll, B., Saenger, W., Biesiadka, J.

(2007) Biochim Biophys Acta 1774: 732-736

• PubMed: 17500051 
• DOI: https://doi.org/10.1016/j.bbapap.2007.03.020
• Primary Citation of Related Structures:  
  2HSG


• PubMed Abstract: 
  

  The catabolite control protein A (CcpA) from Bacillus megaterium is a member of the bacterial repressor protein family GalR-LacI. CcpA functions as master transcriptional regulator of carbon catabolite repression/regulation in firmicutes. Here we present the crystal structure of full-length apo CcpA at 2.5 A resolution from B. megaterium. The structure reveals the location of the helix-turn-helix domain as well as the hinge region, which were not visible due to their high flexibility in earlier crystallographic studies on CcpA molecules. The structure of the apo CcpA homodimer in the present form is in contrast to other reported structures for CcpA.

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Organizational Affiliation: 

Institute for Chemistry and Biochemistry/Crystallography, Freie Universität Berlin, Takustrasse 6, D-14195 Berlin, Germany. [e-mail]

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 36.69 kDa 
• Atom Count: 2,506 
• Modelled Residue Count: 328 
• Deposited Residue Count: 332 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Glucose-resistance amylase regulator	A	332	Priestia megaterium	Mutation(s): 0  Gene Names: ccpA
UniProt
Find proteins for P46828 (Priestia megaterium) Explore P46828  Go to UniProtKB:  P46828

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free:  0.337 (Depositor), 0.340 (DCC) 
• R-Value Work:  0.271 (Depositor), 0.270 (DCC) 
• R-Value Observed: 0.281 (Depositor) 

Space Group: P 6₁ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 74.464	α = 90
b = 74.464	β = 90
c = 238.923	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
PDB_EXTRACT	data extraction
DENZO	data reduction
SCALEPACK	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2007-06-05 
Deposition Author(s): Loll, B., Alings, C., Saenger, W., Biesiadka, J.

Revision History  

• Version 1.0: 2007-06-05
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2023-08-30
  Changes: Data collection, Database references, Refinement description