title: Production, characterization, and immobilization of partially purified surfactant-detergent and alkali-thermostable protease from newly isolated Aeromonas caviae.
abstract: Proteolytic Aeromonas caviae P-1-1 growing at wide-ranging pH (7.0-11.0) and moderate salinity (0-5% NaCl) was isolated from cattle shed of Thanjavur, India. It produced lipase, gelatinase, and polyhydroxybutyrate. Different culture conditions, incubation time, carbon and nitrogen sources, vitamins, amino acids, surfactants, and metal ions for optimal growth and protease production of P-1-1 were examined. Maximum protease (0.128 U/mL) production was achieved with 1% fructose, 1% yeast extract, 0.1% ammonium sulfate, 3% NaCl, 0.1% CaCl2· 2H2O, 1% glycine, 0.1% vitamin E, and 0.1% Tween-40 at pH 8.0 after 42 hr of incubation at 37°C. It was active over broad range of pH (7.0-12.0), temperature (15-100°C), and salinity (0-9% NaCl) with optima at pH 10.0, 55°C, and 3% NaCl. It retained 65 and 48% activities at pH 12.0 and 100°C, respectively. Partially purified protease was highly stable (100%) within pH range 7.0-12.0 and salinities of 0-5% NaCl for 48 hr. Cu2+, Mn2+, Co2+, and Ca2+did not inhibit its activity. Its stability at extreme pHs, temperatures, and in the presence of surfactants and commercial detergents suggests its possible application in laundry detergents. Partially purified protease was immobilized and reused. This is the first report of alkali-thermotolerant, surfactant-detergent-stable partially purified extracellular protease from A. caviae.
authors.affiliation: a Amity Institute of Biotechnology, Amity University , Kolkata , West Bengal , India.|b School of Chemical & Biotechnology, Shanmugha Arts, Science, Technology & Research Academy, Sastra University , Thanjavur , Tamilnadu , India.
authors.forename: Sumitra
authors.initials: S
authors.lastname: Datta
authors.affiliation: c School of Science, RK University , Rajkot , Gujarat , India.
authors.forename: Gopalakrishnan
authors.initials: G
authors.lastname: Menon
authors.affiliation: b School of Chemical & Biotechnology, Shanmugha Arts, Science, Technology & Research Academy, Sastra University , Thanjavur , Tamilnadu , India.
authors.forename: Bincy
authors.initials: B
authors.lastname: Varughese
mesh_terms: D057585:Aeromonas caviae / Q000737:chemistry / Q000201:enzymology* / Q000254:growth & development / Q000378:metabolism; D000468:Alkalies / Q000737:chemistry; D000818:Animals; D002417:Cattle / Q000382:microbiology; D018929:Cell Culture Techniques; D004795:Enzyme Stability; D004800:Enzymes, Immobilized / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D007218:Industrial Microbiology; D008670:Metals / Q000737:chemistry; D010447:Peptide Hydrolases / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D054712:Salinity; D012965:Sodium Chloride / Q000737:chemistry; D013501:Surface-Active Agents / Q000737:chemistry
chemical_list: D000468:Alkalies; D004800:Enzymes, Immobilized; D008670:Metals; D013501:Surface-Active Agents; D012965:Sodium Chloride; D010447:Peptide Hydrolases
keywords: Aeromonas; alkali-thermostable; detergent stable; extremophile; immobilization; protease