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The histidine kinase inhibitor Sda binds near the site of autophosphorylation and may sterically hinder autophosphorylation and phosphotransfer to Spo0F.

Mol. Microbiol.2009 Feb;71(3):659-77. Epub 2008 Nov 24
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摘要


Histidine kinases are widely used by bacteria, fungi and plants to sense and respond to changing environmental conditions. Signals in addition to those directly sensed by the kinase are often integrated by proteins that fine-tune the biological response by modulating the activity of the kinase or its targets. The Bacillus subtilis histidine kinase KinA promotes the initiation of sporulation when nutrients are limiting, but sporulation can be delayed by two inhibitors of KinA, Sda (when DNA replication is perturbed) or KipI (under unknown conditions). We have identified residues in the dimerization/histidine-phosphotransfer (DHp) domain of KinA that are functionally important for inhibition by Sda and KipI and overlapping surface-exposed residues that lie close to or comprise the Sda binding site. Sda inhibits the intermolecular transfer of phosphate from the catalytic ATP-binding (CA) domain of KinA to the autophosphorylation site in the DHp domain when the domains are split into separate polypeptides, either by steric hindrance or by altering the conformation of the DHp domain. Sda also slows the rate of phosphotransfer from KinA approximately P to its target, Spo0F, consistent with our finding that a KinA residue important for Sda function overlaps with the predicted Spo0F binding site on KinA.

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