Structures of the apo- and the metal ion-activated forms of the diphtheria tox repressor from Corynebacterium diphtheriae.Schiering, N., Tao, X., Zeng, H., Murphy, J.R., Petsko, G.A., Ringe, D.
(1995) Proc Natl Acad Sci U S A 92: 9843-9850
- PubMed: 7568230
- DOI: 10.1073/pnas.92.21.9843
- Structures With Same Primary Citation
- PubMed Abstract:
- Iron, Dtxr, and the Regulation of Diphtheria Toxin Expression
Tao, X., Schiering, N., Zeng, H., Ringe, D., Murphy, J.
(1994) Mol Microbiol 14: 191
- Crystallization and Preliminary X-Ray Studies of the Diphtheria Tox Repressor from Corynebacterium Diphtheriae
Schiering, N., Tao, X., Murphy, J., Petsko, G., Ringe, D.
(1994) J Mol Biol 244: 654
The diphtheria tox repressor (DtxR) of Corynebacterium diphtheriae plays a critical role in the regulation of diphtheria toxin expression and the control of other iron-sensitive genes. The crystal structures of apo-DtxR and of the metal ion-activated ...
The diphtheria tox repressor (DtxR) of Corynebacterium diphtheriae plays a critical role in the regulation of diphtheria toxin expression and the control of other iron-sensitive genes. The crystal structures of apo-DtxR and of the metal ion-activated form of the repressor have been solved and used to identify motifs involved in DNA and metal ion binding. Residues involved in binding of the activated repressor to the diphtheria tox operator, glutamine 43, arginine 47, and arginine 50, were located and confirmed by site-directed mutagenesis. Previous biochemical and genetic data can be explained in terms of these structures. Conformational differences between apo- and Ni-DtxR are discussed with regard to the mechanism of action of this repressor.
Department of Chemistry, Brandeis University, Waltham, MA 02154, USA.