Structure of the transcription regulator CcpA from Lactococcus lactis
Loll, B., Kowalczyk, M., Alings, C., Chieduch, A., Bardowski, J., Saenger, W., Biesiadka, J.(2007) Acta Crystallogr D Biol Crystallogr 63: 431-436
- PubMed: 17372346 
- DOI: https://doi.org/10.1107/S0907444907000546
- Primary Citation of Related Structures:  
2O20 - PubMed Abstract: 
Catabolite control protein A (CcpA) functions as master transcriptional regulator of carbon catabolism in Firmicutes. It belongs to the family of bacterial repressor/regulator proteins. Here, the crystal structure of the 76 kDa homodimeric CcpA protein from Lactococcus lactis subsp. lactis IL1403 is presented at 1.9 A resolution in the absence of cognate DNA. The phases were derived by molecular replacement and the structure was refined to crystallographic R and R(free) factors of 0.177 and 0.211, respectively. The presence of a sulfate molecule in the direct vicinity of a putative effector-binding site in the monomer allowed the derivation of a model for the possible binding of small organic effector molecules.
Organizational Affiliation: 
Institute for Chemistry and Biochemistry/Crystallography, Freie Universität Berlin, Takustrasse 6, D-14195 Berlin, Germany.