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Phosphoenolpyruvate-dependent phosphotransferase system of Staphylococcus aureus: ¹H nuclear magnetic resonance studies on phosphorylated and unphosphorylated factor IIIlac and its interaction with the phosphocarrier protein HPr

Kalbitzer, Hans Robert ; Deutscher, J. ; Hengstenberg, W. ; Rösch, P.



Abstract

The trimeric phosphocarrier protein factor III specific for galactosides was investigated by 1H NMR spectroscopy. The protomer contains four histidyl residues with acidic pK values in the range 5.6-6.2. One of the histidyl residues, His-B, carries the phosphoryl group. The pK value of His-B increases from 6.0 to 8.6 upon phosphorylation. To determine the position of the phosphoryl group with ...

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