A closer view of the conformation of the Lac repressor bound to operator.Bell, C.E., Lewis, M.
(2000) Nat.Struct.Mol.Biol. 7: 209-214
- PubMed: 10700279
- DOI: 10.1038/73317
- PubMed Abstract:
- The solution structure of lac repressor headpiece 62 complexed to a symmetrical lac operator sequence determined by NMR and restrained molecular dynamics
Spronk, C.A.E.M.,Bonvin, A.M.J.J.,Radha, P.K.,Melacini, G.,Boelens, R.
(1999) Structure 7: 1483
- Crystal structure of lac repressor core tetramer and its implications for DNA looping
Friedman, A.M.,Fischmann, T.O.,Steitz, T.A.
(1995) Science 268: 1721
- Crystal structure of the lactose operon repressor and its complexes with DNA and inducer
Lewis, M.,Chang, G.,Horton, N.C.,Kercher, M.A.,Pace, H.C.
(1996) Science 271: 1247
- Refined structure of lac repressor headpiece (1-56) determined by relaxation matrix calculations from 2D and 3D NOE data: change of tertiary structure upon binding to the lac operator
Slijper, M.,Bonvin, A.M.,Boelens, R.,Kaptein, R.
(1996) J.Mol.Biol. 259: 761
Crystal structures of the Lac repressor, with and without isopropyithiogalactoside (IPTG), and the repressor bound to operator have provided a model for how the binding of the inducer reduces the affinity of the repressor for the operator. However, b ...
Crystal structures of the Lac repressor, with and without isopropyithiogalactoside (IPTG), and the repressor bound to operator have provided a model for how the binding of the inducer reduces the affinity of the repressor for the operator. However, because of the low resolution of the operator-bound structure (4.8 A), the model for the allosteric transition was presented in terms of structural elements rather than in terms of side chain interactions. Here we have constructed a dimeric Lac repressor and determined its structure at 2.6 A resolution in complex with a symmetric operator and the anti-inducer orthonitrophenylfucoside (ONPF). The structure enables the induced (IPTG-bound) and repressed (operator-bound) conformations of the repressor to be compared in atomic detail. An extensive network of interactions between the DNA-binding and core domains of the repressor suggests a possible mechanism for the allosteric transition.
The Johnson Foundation and Department of Biochemistry and Biophysics, University of Pennsylvania School of Medicine, 37th and Hamilton walk, Philadelphia, Pennsylvania 19102-6059, USA.