Studies on phospholipases from Streptomyces. II. Purification and properties of Streptomyces hachijoensis phospholipase D.

Abstract:

:1. Phospholipase D [EC 3.1.4.4] from Streptomyces hachijoensis was purified about 570-fold by column chromatography on DEAE-cellulose and Sephadex G-50 followed by isoelectric focusing. 2. The purified preparation was found to be homogeneous both by immunodiffusion and polyacrylamide disc gel electrophoresis. 3. The isoelectric point was found to be around pH 8.6 and the molecular weight was about 16,000. 4. The enzyme has maximal activity at pH 7.5 at 37 degrees. The optimal temperature is around 50 degrees at pH 7.5, using 20 min incubation. 5. The enzyme was stable at 50 degrees for 90 min. At neutral pH, between 6 and 8, the enzyme retained more than 95% of its activity on 24 hr incubation at 25 degrees. However, the enzyme lost 80% of its activity under the same conditions at pH 4.0. 6. The enzyme was stimulated slightly by Ca2+, Mn2+, and Co2+, and significantly by Triton X-100 and ethyl ether. It was inhibited by Sn2+, Fe2+, Fe3+, Al3+, EDTA, sodium dodecyl sulfate, sodium cholate, and cetylpyridinium chloride. 7. This phospholipase D hydrolyzes phosphatidylethanolamine, phosphatidylcholine, cardiolipin, sphingomyelin, phosphatidylserine, and lysophosphatidylcholine, liberating the corresponding bases. 8. The Km value was 4mM, determined with phosphatidylethanolamine as a substrate.

journal_name

J Biochem

journal_title

Journal of biochemistry

authors

Okawa Y,Yamaguchi T

doi

10.1093/oxfordjournals.jbchem.a130916

subject

Has Abstract

pub_date

1975-08-01 00:00:00

pages

363-72

issue

2

eissn

0021-924X

issn

1756-2651

journal_volume

78

pub_type

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