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Protease-catalyzed peptide synthesis in acetonitrile/water mixtures, containing 0-90% water, was investigated. alpha-Chymotrypsin, as well as thermolysin, were deposited on solid supports, prior to exposure to the reaction media. Peptide syntheses were performed using both a kinetically controlled
Buried water molecules in the structurally homologous family of eukaryotic serine proteases were examined to determine whether buried waters and their protein environments are conserved in these proteins. We found 16 equivalent water sites conserved in trypsin/ogen, chymotrypsin/ogen, elastase,
Simultaneous Determination of Vitamins.--Klejdus et al. described a simultaneous determination of 10 water- and 10 fat-soluble vitamins in pharmaceutical preparations by liquid chromatography-diode-array detection (LC-DAD). A combined isocratic and linear gradient allowed separation of vitamins in 3
Sodium chloride extracts obtained from purified bovine brain myelin were found to contain proteolytic activity capable of degrading isolated myelin basic protein as assessed by SDS gel electrophoresis. Using gels copolymerized with gelatin as substrate, two bands at about 54 and 117-125 KDa,
We present a fully quantum mechanical calculation for binding interaction between HIV-1 protease (PR) and the water molecule W301 which bridges the flaps of the protease with the inhibitors of PR. The quantum calculation is made possible by applying a recently developed molecular fractionation with
Proteases are important bioactive compounds that have many applications in food processing. In this study, laboratory scale experiments were performed to establish conditions for recovery of a heat stable, acid protease from Pacific whiting (Merluccius productus) surimi process water. Reduction of
Wild type and mutant alpha-lytic protease, differing by only one amino acid, have distinct specificities. Previous studies have shown that motion patterns of the binding pocket play an important role. However, it is still unclear how these differences are generated from a single amino acid mutation.
Recovery of bioactive compounds, such as proteolytic enzymes, from waste streams is a means to both recuperate value and reduce environmental pollution. Previously optimized lab-scale parameters for the recovery of a stable crude protease fraction from Pacific whiting (Merluccius productus) surimi
The activity of two proteases in the esterification of N-acetyl-L-phenylalanine with ethanol was examined in the water-miscible ionic liquid, 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([emim][Tf]). The activity of subtilisin was not only improved 9-fold by changing from a water-miscible
Binding between biomolecules is usually accompanied by the formation of direct interactions with displacement of water from the binding sites. In some cases, however, the interactions are mediated by ordered water molecules, whose effect on binding affinity and the other thermodynamic functions is