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Two N-Linked Glycosylation Sites (Asn18 and Asn106) Are Both Required for Full Enzymatic Activity, Thermal Stability, and Resistance to Proteolysis in Mammalian Deoxyribonuclease I
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- FUJIHARA Junko
- Department of Legal Medicine, Shimane University School of Medicine
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- YASUDA Toshihiro
- Division of Medical Genetics and Biochemistry, Faculty of Medical Sciences, University of Fukui
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- KUNITO Takashi
- Department of Environmental Sciences, Faculty of Science, Shinshu University
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- FUJII Yoshimi
- Department of Legal Medicine, Shimane University School of Medicine
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- TAKATSUKA Hisakazu
- Department of Legal Medicine, Shimane University School of Medicine
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- MORITANI Tamami
- Department of Legal Medicine, Shimane University School of Medicine
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- TAKESHITA Haruo
- Department of Legal Medicine, Shimane University School of Medicine
Bibliographic Information
- Other Title
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- Two N-linked glycosylation sites (Asn18 and Asn106) are both required for full enzymatic activity, thermal stability, and resistance to proteolysis in mammalian deoxyribonuclease 1
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Description
Deoxyribonuclease I (DNase I) is known to be a glycoprotein, and two potential N-linked glycosylation sites (N18 and N106) are known for mammalian enzymes. In the present study, N18 and N106 were mutated in order to investigate the biological role of N-linked glycosylation in three mammalian (human, bovine, and equine) DNases I. The enzyme activities of N18Q and N106Q were lower than that of the wild type, and that of the double mutant (N18Q/N106Q) was lower than those of the single mutants, in accord with the sugar moiety contents in the three mammals. In addition, all mutant enzymes were unstable to heat, suggesting that both sites are required for heat stability. Moreover, in human and equine enzymes, the N18Q and N106Q mutant enzymes were less resistant to trypsin, while N18Q/N106Q was the most sensitive to trypsin. As for bovine DNase I, the trypsin resistance of N18Q and N106Q was similar to that of the wild type, but that of N18Q/N106Q decreased in a time-dependent manner. On the other hand, N-linked glycosylation was not related to pH sensitivity. The results of the present study suggest that N18 and N106 are both necessary for (i) full enzymatic activity, (ii) heat-stability, and (iii) trypsin resistance.
Journal
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- Bioscience, Biotechnology, and Biochemistry
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Bioscience, Biotechnology, and Biochemistry 72 (12), 3197-3205, 2008
Japan Society for Bioscience, Biotechnology, and Agrochemistry
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Keywords
Details 詳細情報について
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- CRID
- 1390282681454495488
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- NII Article ID
- 10027535084
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- NII Book ID
- AA10824164
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- ISSN
- 13476947
- 09168451
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- NDL BIB ID
- 9755948
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- PubMed
- 19060393
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- Text Lang
- en
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- Article Type
- journal article
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- Data Source
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- JaLC
- NDL Search
- Crossref
- CiNii Articles
- KAKEN
- OpenAIRE
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- Abstract License Flag
- Disallowed