|Structure (2005) 13(9):1353-63|
|Northeast Structural Genomics Consortium|
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Response regulators (RRs), which undergo phosphorylation/dephosphorylation at aspartate residues, are highly prevalent in bacterial signal transduction. ...
RRs typically contain an N-terminal receiver domain that regulates the activities of a C-terminal DNA binding domain in a phosphorylation-dependent manner. We present crystallography and solution NMR data for the receiver domain of Escherichia coli PhoB which show distinct 2-fold symmetric dimers in the inactive and active states. These structures, together with the previously determined structure of the C-terminal domain of PhoB bound to DNA, define the conformation of the active transcription factor and provide a model for the mechanism of activation in the OmpR/PhoB subfamily, the largest group of RRs. In the active state, the receiver domains dimerize with 2-fold rotational symmetry using their alpha4-beta5-alpha5 faces, while the effector domains bind to DNA direct repeats with tandem symmetry, implying a loss of intramolecular interactions.
|chemistry metabolism |
|Crystallography Dimerization Transcription Factors Phosphorylation Binding Sites Protein Structure, Secondary Bacterial Proteins Escherichia coli Proteins Solutions |
|80 (Last update: 03/25/2017 11:36:30am)|
|Structure. 2005 Sep;13(9):1353-63.|