Analysis of Catalytic Residues of Thermoactinomyces vulgaris R-47 α-Amylase 2(TVA 2) by Site-directed Mutagenesis
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- ICHIKAWA Kazuhiro
- Department of Applied Biological Science, Faculty of Agriculture, Tokyo University of Agriculture and Technology
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- TONOZUKA Takashi
- Department of Applied Biological Science, Faculty of Agriculture, Tokyo University of Agriculture and Technology
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- YOKOTA Takehiro
- Department of Applied Biological Science, Faculty of Agriculture, Tokyo University of Agriculture and Technology
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- SHIMURA Yoichiro
- Department of Applied Biological Science, Faculty of Agriculture, Tokyo University of Agriculture and Technology
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- SAKANO Yoshiyuki
- Department of Applied Biological Science, Faculty of Agriculture, Tokyo University of Agriculture and Technology
書誌事項
- タイトル別名
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- Analysis of Catalytic Residues of Thermoactinomyces vulgaris R-47 .ALPHA.-Amylase II(TVA II) by Site-directed Mutagenesis.
- Analysis of Catalytic Residues of Thermoactinomyces vulgaris R 47 アルファ Amylase 2 TVA 2 by Site directed Mutagenesis
- Analysis of Catalytic Residues of<i>Thermoactinomyces vulgaris</i>R-47 α-Amylase II (TVA II) by Site-directed Mutagenesis
この論文をさがす
抄録
To confirm that the catalytic residues (Asp325, Glu354, and Asp421) are necessary for the hydrolysis of starch, pullulan, and cyclodextrins, we constructed TVA II mutated by site-directed mutagenesis. The mutated enzymes (D325N, E354Q, and D421N) had markedly reduced levels of activity, less than 0.006% of the wild type, indicating that these three residues are the catalytic sites for these substrates. Even E354D had reduced levels of activity, less than 0.05% of wild type. These four mutated enzymes retained a trace of activity. From the result of hydrolysis patterns for maltohexaose, in particular, D421N, unlike D325N and E354Q, catalyzed transglycosylation rather than hydrolysis. The results suggest that Asp421 could function to capture water molecules.<br>
収録刊行物
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- Bioscience, Biotechnology, and Biochemistry
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Bioscience, Biotechnology, and Biochemistry 64 (12), 2692-2695, 2000
公益社団法人 日本農芸化学会
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詳細情報 詳細情報について
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- CRID
- 1390282681450228864
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- NII論文ID
- 110002679881
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- NII書誌ID
- AA10824164
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- COI
- 1:CAS:528:DC%2BD3MXmtVyitQ%3D%3D
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- ISSN
- 13476947
- 09168451
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- NDL書誌ID
- 5627560
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- PubMed
- 11210138
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可