Structure of transcription regulator CcpA in its DNA-free state

Experimental Data Snapshot

  • Resolution: 2.50 Å
  • R-Value Free: 0.337 
  • R-Value Work: 0.271 
  • R-Value Observed: 0.281 

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

Loll, B.Saenger, W.Biesiadka, J.

(2007) Biochim Biophys Acta 1774: 732-736

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

  • 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.

  • Organizational Affiliation

    Institute for Chemistry and Biochemistry/Crystallography, Freie Universität Berlin, Takustrasse 6, D-14195 Berlin, Germany. Bernard.Loll@mpimf-heidelberg.mpg.de

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Glucose-resistance amylase regulator332Priestia megateriumMutation(s): 0 
Gene Names: ccpA
Find proteins for P46828 (Priestia megaterium)
Explore P46828 
Go to UniProtKB:  P46828
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP46828
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.50 Å
  • R-Value Free: 0.337 
  • R-Value Work: 0.271 
  • R-Value Observed: 0.281 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.464α = 90
b = 74.464β = 90
c = 238.923γ = 120
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • 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