Download MendeleyNMR Structure of the DNA-Binding Domain of the Cell Cycle Protein Mbp1 from Saccharomyces cerevisiae
Nair, M., McIntosh, P.B., Frenkiel, T.A., Kelly, G., Taylor, I.A., Smerdon, S.J., Lane, A.N.(2003) Biochemistry 42: 1266-1273
- PubMed: 12564929
- DOI: https://doi.org/10.1021/bi0205247
- Primary Citation of Related Structures:
1L3G - PubMed Abstract:
The three-dimensional solution structure of the DNA-binding domain of Mlu-1 box binding protein (Mbp1) has been determined by multidimensional NMR spectroscopy. Mbp1 is a cell cycle transcription factor from Saccharomyces cerevisiae and consists of an N-terminal DNA-binding domain, a series of ankyrin repeats, and a heterodimerization domain at the C-terminus. A set of conformers comprising 19 refined structures was calculated via a molecular dynamics simulated annealing protocol using distance, dihedral angle, and residual dipolar coupling restraints derived from either double or triple resonance NMR experiments. The solution structure consists of a six-stranded beta-sheet segment folded against two pairs of alpha-helices in the topology of the winged helix-turn-helix family of proteins and is in agreement with the X-ray structures. In addition, the solution structure shows that the C-terminal tail region of this domain folds back and makes specific interactions with the N-terminal beta-strand of the protein. This C-terminal region is essential for full DNA-binding activity but appears in the X-ray structure to be disordered. The fold-back structure extends the region of positive electrostatic potential, and this may enhance the nonspecific contribution to binding by favorable electrostatic interactions with the DNA backbone.
Organizational Affiliation:
Division of Molecular Structure, National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, United Kingdom.
