An Organic Solvent Resistant Tyrosinase from Streptomyces sp. REN-21 : Purification and Characterization
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概要
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We found a tyrosinase, which has high activity in the presence of organic solvents, in the culture filtrate of Streptomyces sp. REN-21. The organic solvent resistant tyrosinase (OSRT) was purified from the culture filtrate by three column chromatographies. About 1.2 mg of purified OSRT was obtained from 5.6 liters of the culture filtrate with a yield of 26.0%. The purified enzyme had a single polypeptide chain with a molecular mass of about 32,000 Da. The optimum pH and temperature of OSRT were pH 7.0 and 35℃ using L-β-(3,4-dihydroxyphenyl) alanine (L-DOPA) as substrate. OSRT showed stereospecificity toward L-, DL-, and D-enantiomers of DOPA or tyrosine. OSRT had 44% of the activity of the control even in the presence of 50% ethanol, while a mushroom tyrosinase showed only 6% activity under the same conditions. Moreover, OSRT retained its original activity even after 20 h of incubation at 30℃ in the presence of 30% ethanol.
- 社団法人日本農芸化学会の論文
- 2000-02-23
著者
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ITO Masaaki
Central Research Laboratory, Hitachi, Ltd.
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Oda Kohei
Department Of Agricultural Chemistry College Of Agriculture University Of Osaka Prefecture
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Ito Masaaki
Central Laboratory Rengo Co. Ltd.
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Ito Masaaki
Central Laboratory, Rengo Co., Ltd.
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