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Purification and Characterization of Phospholipase D from Actinomycetes KF923.  

곽보연 (한국식품개발연구원 식품기능연구본부)
윤석후 (한국식품개발연구원 식품기능연구본부)
김창진 (한국생명공학연구원)
손동화 (한국식품개발연구원 식품기능연구본부)
Publication Information
Microbiology and Biotechnology Letters / v.31, no.4, 2003 , pp. 389-394 More about this Journal
Abstract
In order to screen microorganisms producing phopholipase D (PLD) had high transphosphatidylation activity, about 1,000 Actinomycetes strains were isolated from the 63 soil samples, collected over 6 local area in Korea. When the hydrolytic activity in the supernatant was determined, 131 strains produced PLD more than 0.3 U/ml. Among 131 culture broths tested, 23 ones had transphosphatidylation activity higher than 20% and finally one strain (Actinomycetes KF 923), which had highest hydrolytic and transphophadylation activity, was selected. Actinomycetes KF923 showed the highest hydrolytic activity (13 U/ml) and phosphatidylation activity (95%) after 48 h fermentation using the P medium (yeast extract 1%, peptone 1%, glucose 1.5%, glycerol 1%, $CaCo_3$ 0.4%, pH 7.2). PLD was purified from the culture broth of Actinomycetes KF923 and the specific activity of purified PLD was 567 U/mg. The molecular weight of PLD was about 55 kD and the optimum pH and temperature were 6.0 and $60^{\circ}C$, respectively. The stability of PLD toward pH and temperature were high around pH 8.0 and below $40^{\circ}C$. Special metal ions were not necessary to the PLD activity.
Keywords
Purification; characteristics; phospholipase D; Actinomycetes;
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