Inclusion of proteins into polyelectrolyte microparticles by alternative adsorption of polyelectrolytes on protein aggregates.

A new method of protein immobilization into polyelectrolyte microparticles by alternative adsorption of the oppositely charged polyelectrolytes on the aggregates obtained by salting out of protein is proposed. The model protein alpha-chymotrypsin (ChT) was included in the polyelectrolyte microparticles obtained by various number of polyelectrolyte adsorption steps (from 1 to 11). The main parameters of ChT inclusion into microparticles were calculated.

Encapsulation of proteins by layer-by-layer adsorption of polyelectrolytes onto protein aggregates: factors regulating the protein release.

A novel method of protein encapsulation is proposed. Preformed protein aggregates are covered with polyelectrolyte layers by means of layer-by-layer adsorption. The polyelectrolyte membrane prevents protein leakage out of the capsule.

Effect of hydrophobization of basic pancreatic proteinase inhibitor on the inhibition of bovine trypsin and human leukocyte elastase.

The effect of modification of basic pancreatic trypsin inhibitor (BPTI) by derivatives of fatty acids (oleic, stearic) on the inhibition of bovine trypsin and human leukocyte elastase (HLE) was studied. Kinetic constants of interaction with trypsin and inhibition constants of both enzymes were determined. Hydrophobization of BPTI had virtually no effect on its high affinity for trypsin.

Interaction of human leukocyte elastase with plasma fibronectin and its inhibition by soybean Bowman-Birk protease inhibitor.

Binding of human leukocyte elastase (HLE) to human plasma fibronectin (Fn) was determined by its competition with an oligopeptide chromogenic substrate. Kinetic curves of accumulation of the substrate hydrolysis product in the presence of Fn were specific for slow-binding one-step inhibitors of the enzyme. Values of rate constants for HLE association with Fn and for the dissociation of the complex were, respectively, 2.