The α10 helix of DevR, the Mycobacterium tuberculosis dormancy response regulator, regulates its DNA binding and activity
Abstract
The crystal structures of several bacterial response regulators provide insight into the various interdomain molecular interactions potentially involved in maintaining their 'active' or 'inactive' states. However, the requirement of high concentrations of protein, an optimal pH and ionic strength buffers during crystallization may result in a structure somewhat different from that observed in solution. Therefore, functional assessment of the physiological relevance of the crystal structure data is imperative. DevR/DosR dormancy regulator of Mycobacterium tuberculosis (Mtb) belongs to the NarL subfamily of response regulators. The crystal structure of unphosphorylated DevR revealed that it forms a dimer through the α5/α6 interface. It was proposed that phosphorylation may trigger extensive structural rearrangements in DevR that culminate in the formation of a DNA-binding competent dimeric species via α10-α10 helix interactions. The α10 helix-deleted DevR protein (DevR∆α10 ) was hyperphosphorylated but defective with respect to in vitro DNA binding. Biophysical characterization reveals that DevR∆α10 has an open but less stable conformation. The combined cross-linking and DNA-binding data demonstrate that the α10 helix is essentia...Continue Reading
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