The Structural Basis of Acyl Coenzyme A-Dependent Regulation of the Transcription Factor FadrVan Aalten, D.M.F., Dirusso, C.C., Knudsen, J.
(2001) Embo J. 20: 2041
- PubMed: 11296236
- DOI: 10.1093/emboj/20.8.2041
- Primary Citation of Related Structures:
- PubMed Abstract:
- Crystal Structure of Fadr, a Fatty Acid-Responsive Transcription Factor with a Novel Acyl Coenzyme A-Binding Fold
Van Aalten, D.M.,Dirusso, C.C.,Knudsen, J.,Wierenga, R.K.
(2000) Embo J. 19: 5167
- Crystallization and X-Ray Diffraction Studies of the Fatty-Acid Responsive Transcription Factor Fadr from Escherichia Coli
Van Aalten, D.M.F.,Knudsen, J.,Dirusso, C.C.,Kokko, T.,Wierenga, R.K.
(2000) Acta Crystallogr.,Sect.D 56: 469
FadR is an acyl-CoA-responsive transcription factor, regulating fatty acid biosynthetic and degradation genes in Escherichia coli. The apo-protein binds DNA as a homodimer, an interaction that is disrupted by binding of acyl-COA: The recently describ ...
FadR is an acyl-CoA-responsive transcription factor, regulating fatty acid biosynthetic and degradation genes in Escherichia coli. The apo-protein binds DNA as a homodimer, an interaction that is disrupted by binding of acyl-COA: The recently described structure of apo-FadR shows a DNA binding domain coupled to an acyl-CoA binding domain with a novel fold, but does not explain how binding of the acyl-CoA effector molecule > 30 A away from the DNA binding site affects transcriptional regulation. Here, we describe the structures of the FadR-operator and FadR- myristoyl-CoA binary complexes. The FadR-DNA complex reveals a novel winged helix-turn-helix protein-DNA interaction, involving sequence-specific contacts from the wing to the minor groove. Binding of acyl-CoA results in dramatic conformational changes throughout the protein, with backbone shifts up to 4.5 A. The net effect is a rearrangement of the DNA binding domains in the dimer, resulting in a change of 7.2 A in separation of the DNA recognition helices and the loss of DNA binding, revealing the molecular basis of acyl-CoA-responsive regulation.
Wellcome Trust Biocentre, Division of Biological Chemistry and Molecular Microbiology, School of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5EH, UK. firstname.lastname@example.org