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Effect of limited enzymatic hydrolysis on linoleic acid binding properties of β-lactoglobulin.

Food chemistry (2013-11-02)
Osvaldo E Sponton, Adrián A Perez, Carlos Carrara, Liliana G Santiago
ABSTRACT

β-Lactoglobulin (BLG) is a member of lipocalin family, proteins with ability to bind small hydrophobic ligands, such as retinol, vitamins and fatty acids. Moreover, BLG is susceptible to protease action producing a wide range of polypeptides depending on the hydrolysis degree (HD). In the present work, the effect of limited enzymatic hydrolysis on fatty acid binding properties of BLG was studied. Linoleic acid (LA) was used as a model fatty acid. Limited enzymatic hydrolysis was performed using α-chymotrypsin immobilised on agarose microparticles. BLG hydrolysates were produced at HD: 1%, 3% and 5%. In order to determine the influence of HD on BLG molecular weight SDS-PAGE was used. BLG structural modification and LA binding properties were monitored by means of fluorescence spectroscopic techniques. The increase in HD produced: (i) a BLG degradation and a molecular weight distribution of BLG hydrolysates and (ii) an increased exposition of buried hydrophobic residues, however it was observed a decrease in surface hydrophobicity possibly due to a deterioration of hydrophobic protein domains. It was observed that enzymatic hydrolysis treatment produced a decrease in BLG ability for binding LA. It was concluded that limited enzymatic hydrolysis could deteriorate the specific site on BLG structure necessary for binding LA.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
α-Chymotrypsin from bovine pancreas, (TLCK treated to inactivate residual tryspin activity), Type VII, essentially salt-free, lyophilized powder, ≥40 units/mg protein
Sigma-Aldrich
α-Chymotrypsin from bovine pancreas, Type I-S, essentially salt-free, lyophilized powder
Sigma-Aldrich
α-Chymotrypsin from bovine pancreas, ≥40 units/mg protein, vial of 5 mg
Sigma-Aldrich
α-Chymotrypsin from human pancreas, lyophilized powder
Sigma-Aldrich
α-Chymotrypsin from bovine pancreas, Type II, lyophilized powder, ≥40 units/mg protein
Sigma-Aldrich
α-Chymotrypsin from bovine pancreas, suitable for protein sequencing, salt-free, lyophilized powder
Sigma-Aldrich
α-Chymotrypsin−Agarose from bovine pancreas, lyophilized powder, 2,000-3,500 units/g agarose (One ml gel will yield 65-120 units)