Purification and characterization of a lipase from Pseudomonas aeruginosa KKA-5 and its role in castor oil hydrolysis |
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Authors: | C Sharon S Furugoh T Yamakido H I Ogawa Y Kato |
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Institution: | (1) Dept of Applied Chemistry, Kyushu Institute of Technology, 1-1 Sensui-cho, Tobata, Kitakyushu–804, Japan, JP |
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Abstract: | An extracellular lipase (triacylglycerol acylhydrolase, EC 3.1.1.3) from Pseudomonas aeruginosa KKA-5 hydrolyzed castor oil by 90%. Purification of this castor oil-hydrolyzing lipase included ammonium sulfate precipitation
and successive hydroxylapatite column chromatography. The enzyme was purified 518-fold. It was homogeneous electrophoretically
and its molecular weight was estimated to be 30 kDa. The enzyme was stable up to 45°C and retained its activity in the alkaline
pH range. Lipase was highly stable in the presence of aqueous organic solvents like methanol and ethanol. It was weakly inhibited
in the presence of acetone. The anionic surfactant, sodium dodecyl sulfate, was inhibitory while the cationic surfactants,
Triton X-100 and Tween-80 appreciably enhanced activity. Lipase was stabilized significantly by Ca2+. Inactivation of the enzyme by EDTA was overcome by sequential CaCl2 treatment. This finding suggests the existence of a calcium-binding site in Pseudomonas aeruginosa KKA-5 lipase.
Received 22 January 1998/ Accepted in revised form 27 April 1998 |
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Keywords: | : calcium castor oil hydrolysis lipase Pseudomonas aeruginosa purification |
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