Purification and Characterization of Aspartic Protease Derived from Sf9 Insect Cells
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概要
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An aspartic protease that is significantly produced by baculovirus-infected Spodoptera frugiperda Sf9 insect cells was purified to homogeneity from a growth medium. To monitor aspartic protease activity, an internally quenched fluoresce (IQF) substrate specific to cathepsin D was used. The purified aspartic protease showed a single protein band on SDS–PAGE with an apparent molecular mass of 40 kDa. The N-terminal amino acid sequence of the enzyme had a high homology to a Bombyx mori aspartic protease. The enzyme showed greatest affinity for the IQF substrate at pH 3.0 with a Km of 0.85 μM. The kcat and kcat⁄Km values were 13 s−1 and 15 s−1 μM−1 respectively. Pepstatin A proved to be a potent competitive inhibitor with inhibitor constant, Ki, of 25 pM.
- 2010-10-23
著者
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Takahashi S
Akita Res. Inst. Food And Brewing Akita Jpn
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Gotoh Takeshi
Department of Engineering in Applied Chemistry, Akita University
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Kikuchi Ken-Ichi
Department of Engineering in Applied Chemistry, Akita University
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TAKAHASHI Saori
Akita Research Institute of Food and Brewing
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Takahashi S
Kyoto Univ. Kyoto Jpn
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Ono Hiroki
Department of Materials-Process Engineering and Applied Chemistry for Environments, Akita University
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NIRASAWA Satoru
Japan International Research Center for Agricultural Sciences
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Takahashi S
Akita Res. Inst. Of Food And Brewing
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Takahashi Saori
Akita Res. Inst. Of Food And Brewing
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Ono Hiroki
Department Of Cardiovascular Medicine Kitakyushu Municipal Medical Center
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Kikuchi Ken-ichi
Department Of Engineering In Applied Chemistry Akita University
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Gotoh Takeshi
Department Of Engineering In Applied Chemistry Akita University
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Gotoh Takeshi
Department Of Engineering In Applied Chemistry Graduate School Of Engineering And Resource Science A
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Kikuchi Ken-ichi
Department Of Engineering In Applied Chemistry Graduate School Of Engineering And Resource Science A
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Nirasawa Satoru
Post-harvest Science And Technology Division Japan International Research Center For Agricultural Sc
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Suzuki Takahito
Biological Laboratory Faculty Of Science Nara Women's University
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Ono Hiroki
Department Of Materials-process Engineering And Applied Chemistry For Environments Akita University
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Takahashi S
Department Of Biology The University Of Tokyo
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Gotoh Takeshi
Department Of Engineering And Applied Chemistry Graduate School Of Engineering And Resource Science
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Takahashi Satoru
Institute Of Basic Medical Sceinces And Center For Tara
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KIKUCHI KEN-ICHI
Department of Chemical Engineering for Resources, Akita University
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