Salt-Induced Universal Slowing Down of the Short-Time Self-Diffusion of a Globular Protein in Aqueous Solution
- Inst. Laue-Langevin (ILL), Grenoble (France); Univ. Tubingen, Tubingen (Germany)
- Inst. Laue-Langevin (ILL), Grenoble (France)
- Univ. Tubingen, Tubingen (Germany)
- Julich Research Centre (Germany). Julich Centre for Neutron Science (JCNS); JCNS Outstation at the MLZ, Garching (Germany)
- Julich Research Centre (Germany). Julich Centre for Neutron Science (JCNS); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
The short-time self-diffusion D of the globular model protein bovine serum albumin in aqueous (D2O) solutions has been measured comprehensively as a function of the protein and trivalent salt (YCl3) concentration, noted cp and cs, respectively. We observe that D follows a universal master curve D(cs,cp) = D(cs = 0,cp) g(cs/cp), where D(cs= 0,cp) is the diffusion coefficient in the absence of salt and g(cs/cp) is a scalar function solely depending on the ratio of the salt and protein concentration. This observation is consistent with a universal scaling of the bonding probability in a picture of cluster formation of patchy particles. In conclusion, the finding corroborates the predictive power of the description of proteins as colloids with distinct attractive ion-activated surface patches.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1261447
- Journal Information:
- Journal of Physical Chemistry Letters, Vol. 6, Issue 13; ISSN 1948-7185
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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