Structures of the apo- and the metal ion-activated forms of the diphtheria tox repressor from Corynebacterium diphtheriae. Academic Article uri icon

Overview

abstract

  • 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.

publication date

  • October 10, 1995

Research

keywords

  • Apoproteins
  • Bacterial Proteins
  • Corynebacterium diphtheriae
  • DNA-Binding Proteins
  • Nickel
  • Repressor Proteins

Identity

PubMed Central ID

  • PMC40899

Scopus Document Identifier

  • 0028826149

Digital Object Identifier (DOI)

  • 10.1073/pnas.92.21.9843

PubMed ID

  • 7568230

Additional Document Info

volume

  • 92

issue

  • 21