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Entry to sporulation in bacilli is governed by a histidine kinase phosphorelay, a variation of the predominant signal transduction mechanism in prokaryotes. Sda directly inhibits sporulation histidine kinases in response to DNA damage and replication defects. We determined a 2.0-A-resolution X-ray crystal structure of the intact cytoplasmic catalytic core [comprising the dimerization and histidine phosphotransfer domain (DHp domain), connected to the ATP binding catalytic domain] of the Geobacillus stearothermophilus sporulation kinase KinB complexed with Sda. Structural and biochemical analyses reveal that Sda binds to the base of the DHp domain and prevents molecular transactions with the DHp domain to which it is bound by acting as a simple molecular barricade. Sda acts to sterically block communication between the catalytic domain and the DHp domain, which is required for autophosphorylation, as well as to sterically block communication between the response regulator Spo0F and the DHp domain, which is required for phosphotransfer and phosphatase activities.

Original publication

DOI

10.1016/j.jmb.2008.12.006

Type

Journal article

Journal

J Mol Biol

Publication Date

13/02/2009

Volume

386

Pages

163 - 177

Keywords

Amino Acid Sequence, Bacterial Proteins, Binding Sites, Crystallography, X-Ray, Dimerization, Geobacillus stearothermophilus, Histidine Kinase, Models, Biological, Models, Molecular, Molecular Sequence Data, Phosphorylation, Protein Conformation, Protein Kinase Inhibitors, Protein Kinases, Spores, Bacterial