HPr Kinase/Phosphorylase, the Sensor Enzyme of Catabolite Repression in Gram-Positive Bacteria: Structural Aspects of the Enzyme and the Complex with Its Protein Substrate

HPr kinase/phosphorylase (HprK/P), the sensor enzyme for catabolite repression in gram-positive bacteria, phosphorylates HPr, a phosphocarrier protein of a sugar transport and phosphorylation system ([41][1]), at a serine residue ([10][2]). To carry out its catalytic function in sugar transport and

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