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The phosphoenolpyruvate‐dependent phosphotransferase system of Staphylococcus aureus 3. 1H and 31P nuclear‐magnetic‐resonance studies on the phosphocarrier protein HPr; tyrosine titration and denaturation studies

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Schrecker,  Otto
Max Planck Institute for Medical Research, Max Planck Society;

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Hengstenberg,  Wolfgang
Max Planck Institute for Medical Research, Max Planck Society;

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Gassner,  Martin K.
Max Planck Institute for Medical Research, Max Planck Society;

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Stehlik,  Dietmar
Max Planck Institute for Medical Research, Max Planck Society;

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Citation

Maurer, W., Rüterjans, H., Schrecker, O., Hengstenberg, W., Gassner, M. K., & Stehlik, D. (1977). The phosphoenolpyruvate‐dependent phosphotransferase system of Staphylococcus aureus 3. 1H and 31P nuclear‐magnetic‐resonance studies on the phosphocarrier protein HPr; tyrosine titration and denaturation studies. European Journal of Biochemistry, 75(1), 297-301. doi:10.1111/j.1432-1033.1977.tb11529.x.


Cite as: https://hdl.handle.net/21.11116/0000-0002-DA26-E
Abstract

The phosphocarrier protein HPr has been investigated by proton nuclear magnetic resonance (NMR) at 270 MHz in order to evaluate structural properties of the whole molecule and its active site.

The titration behaviour of the three tyrosines of the HPr protein was analysed by monitoring the chemical shifts of the aromatic proton resonances of these residues as a function of pH.

It was found that the HPr protein contains a lot of slowly exchanging NH backbone protons which suggested a relatively rigid secondary structure of the protein molecule itself although it contains no disulfide bridges.

The HPr protein shows a sharp reversible denaturation behaviour at alkaline pH values. Between pH 10.8 and 11.1 two C‐2 proton resonance peaks for the single histidine residue could be observed together with abrupt changes in the aromatic and aliphatic absorption region of the HPr protein which are due to chemical exchange processes. The NMR spectrum of the HPr protein is only changed a little upon raising the temperature from 14°C to 70°C. At 76°C all resonances in the spectrum broaden and almost disappear. This process is irreversible.