A Mesohaline Thraustochytrid Produces Extremely Halophilic Alpha-Amylases
Autor: | Priyanka V. Shirodkar, Samir Damare, Usha Devi Muraleedharan, Seshagiri Raghukumar |
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Rok vydání: | 2019 |
Předmět: |
0106 biological sciences
0301 basic medicine chemistry.chemical_classification Salinity Microorganism Size-exclusion chromatography Biology 01 natural sciences Applied Microbiology and Biotechnology Halophile 03 medical and health sciences 030104 developmental biology Enzyme chemistry Biochemistry 010608 biotechnology Enzyme Stability biology.protein Solvents Seawater Amylase alpha-Amylases Alpha-amylase Stramenopiles |
Zdroj: | Marine biotechnology (New York, N.Y.). 22(3) |
ISSN: | 1436-2236 |
Popis: | Halophilic bacteria are well known to produce highly salt-tolerant enzymes that have unusual applications in biotechnology. Production of halophilic proteins is generally not expected in mesohaline microorganisms. Ulkenia sp. AH-2, a mesohaline, marine straminipilan thraustochytrid isolated from waters of a mangrove ecosystem, produces halophilic alpha-amylases. Four enzyme fractions, viz.., A, B, C, and D, were obtained upon ammonium sulfate fractionation and gel filtration. These had a broad salinity tolerance ranging from 0 to 4 M NaCl, with an optimum at 3 M NaCl. Pools A, C, and D each resolved as a single band on PAGE and zymogram analysis, and the purified proteins were designated Amy a, Amy c, and Amy h. The major activity resided in “pool B,” consisting of several amylases which could not be further resolved into pure fractions. Together, these had an optimum at 2 M NaCl. All the enzymes were stable to storage for 2 to 24 h at 4 °C in a range of salt concentrations and even showed enhanced activity following such incubations. True to halophilic enzymes, the complex of “pool B” amylases showed improved activity in the presence of a wide range of organic solvents at 20% concentration. These enzymes are of particular interest by virtue of their constitutive nature as well as production under culture conditions that do not require salinity beyond that of seawater. |
Databáze: | OpenAIRE |
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