Enhanced production and organic solvent stability of a protease fromBrevibacillus laterosporus strain PAP04
Braz. j. med. biol. res; 49 (4), 2016
Publication year: 2016
A bacterial strain (PAP04) isolated from cattle farm soil was shown to produce an extracellular, solvent-stable protease. Sequence analysis using 16S rRNA showed that this strain was highly homologous (99%) to Brevibacillus laterosporus. Growth conditions that optimize protease production in this strain were determined as maltose (carbon source), skim milk (nitrogen source), pH 7.0, 40°C temperature, and 48 h incubation. Overall, conditions were optimized to yield a 5.91-fold higher production of protease compared to standard conditions. Furthermore, the stability of the enzyme in organic solvents was assessed by incubation for 2 weeks in solutions containing 50% concentration of various organic solvents. The enzyme retained activity in all tested solvents except ethanol; however, the protease activity was stimulated in benzene (74%) followed by acetone (63%) and chloroform (54.8%). In addition, the plate assay and zymography results also confirmed the stability of the PAP04 protease in various organic solvents. The organic solvent stability of this protease at high (50%) concentrations of solvents makes it an alternative catalyst for peptide synthesis in non-aqueous media.
Proteínas Bacterianas/biosíntesis, Proteínas Bacterianas/química, Brevibacillus/aislamiento & purificación, Brevibacillus/metabolismo, Bovinos, Medios de Cultivo, Electroforesis en Gel de Poliacrilamida, Estabilidad de Enzimas, Concentración de Iones de Hidrógeno, Compuestos Orgánicos/metabolismo, Péptido Hidrolasas/biosíntesis, Péptido Hidrolasas/química, Microbiología del Suelo, Solventes, Temperatura, Factores de Tiempo