β-Lactoglobulin associative interactions: a small-angle scattering study.

In this study, the β-lactoglobulin (β-lg) conformation stability in solution was studied as a function of the protein concentration, pH, NaCl and temperature when the protein concentration is significantly higher in the buffer solution. Using small-angle X-ray and neutron scattering methods (SANS and SAXS), it was shown that β-lg forms dimeric structures in 50 mM HEPES buffer under various conditions of the medium. At pH 5.9, β-lg preserves its dimeric form in the high protein concentration range of 10-40 mg/mL. However, the conformation swelled with the addition of 50 mM NaCl in the system with 20 mg/mL β-lg concentration. Further increase of NaCl concentration leads to a decrease of the radius of gyration of the β-lg dimer. At pH below 5.9 where the protein is positively charged, β-lg dimer preserves its conformation, and only an increase of the radius of gyration was attested by SAXS as the acidity of the medium increased to pH 3.6. This supports and adds to the findings presented above regarding the stability of β-lg dimer in 50 mM HEPES buffer in D2O. Furthermore, at neutral and alkaline pH, the values of both radius of gyration and maximum particle dimension decrease by increasing the pH of the medium.
PMID: 30923869 [PubMed - as supplied by publisher]

Source: European Biophysics Journal : EBJ - March 27, 2019 Category: Physics Authors: Anghel L, Rogachev A, Kuklin A, Erhan RV Tags: Eur Biophys J Source Type: research