IR @ Goa University

A mesohaline thraustochytrid produces extremely halophilic alpha-amylases

Show simple item record Shirodkar, P.V. Muraleedharan, U.D. Damare, S. Raghukumar, S. 2020-03-16T05:13:09Z 2020-03-16T05:13:09Z 2020
dc.identifier.citation Marine Biotechnology. 22(3); 2020; 403-410. en_US
dc.description.abstract 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 degrees 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 percent 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. en_US
dc.publisher Springer en_US
dc.subject Biotechnology en_US
dc.title A mesohaline thraustochytrid produces extremely halophilic alpha-amylases en_US
dc.type Journal article en_US
dc.identifier.impf y

Files in this item

This item appears in the following Collection(s)

Show simple item record

Search IR

Advanced Search


My Account