Download MendeleyIntegration Host Factor: putting a twist on protein-DNA recognition
Lynch, T.W., Read, E.K., Mattis, A.N., Gardner, J.F., Rice, P.A.(2003) J Mol Biol 330: 493-502
- PubMed: 12842466
- DOI: https://doi.org/10.1016/s0022-2836(03)00529-1
- Primary Citation of Related Structures:
1OUZ, 1OWF, 1OWG - PubMed Abstract:
Integration host factor (IHF) is a DNA-bending protein that recognizes its cognate sites through indirect readout. Previous studies have shown that binding of wild-type (WT)-IHF is disrupted by a T to A mutation at the center position of a conserved TTR motif in its binding site, and that substitution of betaGlu44 with Ala prevented IHF from discriminating between A and T at this position. We have determined the crystal structures and relative binding affinities for all combinations of WT-IHF and IHF-betaGlu44Ala bound to the WT and mutant DNAs. Comparison of these structures reveals that DNA twist plays a major role in DNA recognition by IHF, and that this geometric parameter is dependent on the dinucleotide step and not on the bound IHF variant.
Organizational Affiliation:
Department of Biochemistry and Molecular Biology, The University of Chicago, 920 E 58th Street CLSC 221, Chicago, IL 60637, USA.
