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Specific Buffer Effects on the Intermolecular Interactions among Protein Molecules at Physiological pH
journal contribution
posted on 2020-08-07, 15:41 authored by Andrea Salis, Luca Cappai, Cristina Carucci, Drew F. Parsons, Maura MonduzziBSA and lysozyme
molecular motion at pH 7.15 is buffer-specific.
Adsorption of buffer ions on protein surfaces modulates the protein
surface charge and thus protein–protein interactions. Interactions
were estimated by means of the interaction parameter kD obtained from plots of diffusion coefficients at different
protein concentrations (Dapp = D0[1 + kDCprotein]) via dynamic light scattering and nuclear
magnetic resonance. The obtained results agree with recent findings
confirming doubts regarding the validity of the Henderson–Hasselbalch
equation, which has traditionally provided a basis for understanding
pH buffers of primary importance in solution chemistry, electrochemistry,
and biochemistry.