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Title: Salt-Induced Universal Slowing Down of the Short-Time Self-Diffusion of a Globular Protein in Aqueous Solution

Journal Article · · Journal of Physical Chemistry Letters
 [1];  [2];  [1];  [3];  [3];  [4];  [5];  [3];  [2]
  1. Inst. Laue-Langevin (ILL), Grenoble (France); Univ. Tubingen, Tubingen (Germany)
  2. Inst. Laue-Langevin (ILL), Grenoble (France)
  3. Univ. Tubingen, Tubingen (Germany)
  4. Julich Research Centre (Germany). Julich Centre for Neutron Science (JCNS); JCNS Outstation at the MLZ, Garching (Germany)
  5. 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
Citation Metrics:
Cited by: 29 works
Citation information provided by
Web of Science

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The role of pH, metal ions and their hydroxides in charge reversal of protein-coated nanoparticles text January 2019
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Liquid–Liquid Phase Separation by Intrinsically Disordered Protein Regions of Viruses: Roles in Viral Life Cycle and Control of Virus–Host Interactions journal November 2020