Vrbka, L and Jungwirth, Pavel and Bauduin, P and Touraud, Didier and Kunz, Werner (2006) Specific ion effects at protein surfaces: A molecular dynamics study of bovine pancreatic trypsin inhibitor and horseradish peroxidase in selected salt solutions. JOURNAL OF PHYSICAL CHEMISTRY B, 110 (13). pp. 7036-7043. ISSN 1520-6106,
Full text not available from this repository. (Request a copy)Abstract
The distribution of sodium, choline, sulfate, and chloride ions around two proteins, horseradish peroxidase (HRP) and bovine pancreatic trypsin inhibitor (BPTI), is investigated by means of molecular dynamics simulations with the aim to elucidate ion adsorption at the protein surface. Although the two proteins under investigation are very different from each other, the ion distributions around them are remarkably similar. Sulfate is always strongly attached to the proteins, choline shows a significant, but unspecific, propensity for the protein surfaces, and sodium ions have a weak surface affinity, while chloride has virtually no preference for the protein surface. In mixtures of all four ion species in protein solutions, the resulting distributions are almost a superposition of the distributions of sodium sulfate and choline chloride, except that sodium partially replaces choline close to the proteins. The present simulations support a picture of ions interacting with individual ionic and polar amino acid groups rather than with an averaged protein surface. The results thus show how subtle the so-called Hofmeister and electroselectivity effects are in salt solution of proteins, making all simplified interaction models questionable.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | HOFMEISTER-SERIES; BINDING; RECEPTOR; ACETYLCHOLINE; MECHANISM; WATER; PH; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > Prof. Dr. Werner Kunz |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 16 Feb 2021 10:08 |
| Last Modified: | 16 Feb 2021 10:08 |
| URI: | https://pred.uni-regensburg.de/id/eprint/34701 |
Actions (login required)
 |
View Item |
