Conformational behaviour of the TraM headpiece

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The structure of the headpiece of the TraM protein was investigated in different solvents. The very first 22 amino acids which alternate in their hydrophilic and hydrophobic character formed a helical structure in the presence of a membrane mimetic. In water alone the structure was flexible with a small amount of helicity according to circular dichroism measurements, whereas a loop structure was observed in dimethyl sulphoxide

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