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1H NMR study of water relaxation and self-diffusion in human serum albumin aqueous solutions

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Il Nuovo Cimento D

Summary

Water proton spin-lattice relaxation and self-diffusion in aqueous solutions of human serum albumin have been studied by1H NMR as a function of the protein concentration. Spin-lattice relaxation data, which display a nonlinear behaviour with the protein concentration, could be fitted with a two-phase model taking into account the experimentally determined hydration («bound») water values. Despite a similar trend is registered for the water self-diffusion coefficient, such a model has been found unable to explain the related experimental data taken as a function of the biomolecule concentration. On the other hand, the solute-induced proton self-diffusion decrease could be satisfactorily interpreted by postulating an enhanced probability of hydrogen-bond formation occurring within the «vicinal» water surrounding the biomolecules for several hydration shells. The consistency within the two models is discussed in connection with the magnetic interactions occurring within the solute-solvent systems.

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Authors and Affiliations

  1. Gruppo di Biofisica Molecolare, Dipartimento di Fisica dell'Università, I-06100, Perugia, Italia

    R. Lamanna & S. Cannistraro

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  1. R. Lamanna
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  2. S. Cannistraro
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Lamanna, R., Cannistraro, S. 1H NMR study of water relaxation and self-diffusion in human serum albumin aqueous solutions. Il Nuovo Cimento D 13, 261–271 (1991). https://doi.org/10.1007/BF02456954

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  • DOI: https://doi.org/10.1007/BF02456954

PACS 66.10

PACS 76.60

PACS 87.15

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