Comparison of negative and positive ion electrospray ionization mass spectra of calmodulin and its complex with trifluoperazine
The protein calmodulin (apoCaM) undergoes a conformational change when it binds calcium. This structure of the protein (Ca4CaM) is a dumbbell-shaped molecule that undergoes a further profound conformational change on binding of the antipsychotic drug trifluoperazine (TFP). Experimental conditions were developed to prepare samples of apoCaM, Ca4CaM and Ca4CaM/TFP that were substantially free of sodium. The effects of the conformational changes of calmodulin on the charge-state distributions...[Show more]
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|Source:||Rapid Communications in Mass Spectrometry|
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