Specificity and affinity of Lac repressor for the auxiliary operators O2 and O3 are explained by the structures of their protein-DNA complexes.
Romanuka, J., Folkers, G.E., Biris, N., Tishchenko, E., Wienk, H., Bonvin, A.M., Kaptein, R., Boelens, R.(2009) J Mol Biol 390: 478-489
- PubMed: 19450607 
- DOI: 10.1016/j.jmb.2009.05.022
- Primary Citation of Related Structures:  
2KEI, 2KEJ, 2KEK - PubMed Abstract: 
The structures of a dimeric mutant of the Lac repressor DNA-binding domain complexed with the auxiliary operators O2 and O3 have been determined using NMR spectroscopy and compared to the structures of the previously determined Lac-O1 and Lac-nonoperator complexes ...