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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences >
Peer-reviewed Journal Articles, etc >
Discovery of a Novel Alginate Lyase from Nitratiruptor sp SB155-2 Thriving at Deep-sea Hydrothermal Vents and Identification of the Residues Responsible for Its Heat Stability
| Title: | Discovery of a Novel Alginate Lyase from Nitratiruptor sp SB155-2 Thriving at Deep-sea Hydrothermal Vents and Identification of the Residues Responsible for Its Heat Stability |
| Authors: | Inoue, Akira Browse this author →KAKEN DB | | Anraku, Moe Browse this author | | Nakagawa, Satoshi Browse this author →KAKEN DB | | Ojima, Takao Browse this author →KAKEN DB |
| Issue Date: | 23-Jul-2016 |
| Publisher: | American Society for Biochemistry and Molecular Biology (ASBMB) |
| Journal Title: | Journal of Biological Chemistry (JBC) |
| Volume: | 291 |
| Issue: | 30 |
| Start Page: | 15551 |
| End Page: | 15563 |
| Publisher DOI: | 10.1074/jbc.M115.713230 |
| Abstract: | Extremophiles are expected to represent a source of enzymes having unique functional properties. The hypothetical protein NIS_0185, termed NitAly in this study, was identified as an alginate lyase-homolog protein in the genomic database of epsilon-Proteobacteria Nitratiruptor sp.SB155-2, which was isolated from deep-sea hydrothermal vents at a water depth of 1,000 m. Among the characterized alginate lyases in the polysaccharide lyase family 7 (PL-7), the amino acid sequence of NitAly showed the highest identity (39%) with that of red alga Pyropia yezoensis alginate lyase PyAly. Recombinant NitAly (rNitAly) was successfully expressed in Escherichia coli. Purified rNitAly degraded alginate in an endolytic manner. Among alginate block types, polyM was preferable to polyG and polyMG as a substrate, and its end degradation products were mainly tri-, tetra-, and penta-saccharides. The optimum temperature and pH values were 70 degrees C and around 6, respectively. Ahigh concentration of NaCl (0.8-1.4 M) was required for maximum activity. In addition, a 50% loss of activity was observed after incubation at 67 degrees C for 30 min. Heat stability was decreased in the presence of 5 mM DTT, and Cys-80 and Cys-232 were identified as the residues responsible for heat stability but not lyase activity. Introducing two cysteines into PyAly based on homology modeling using Pseudomonas aeruginosa alginate lyase PA1167 as the template enhanced its heat stability. Thus, NitAly is a functional alginate lyase, with its unique optimum conditions adapted to its environment. These insights into the heat stability of NitAly could be applied to improve that of other PL-7 alginate lyases. |
| Rights: | This research was originally published in Journal of Biological Chemistry (JBC). Inoue, Akira, Anraku, Moe, Nakagawa, Satoshi, Ojima, Takao. Discovery of a Novel Alginate Lyase from Nitratiruptor sp SB155-2 Thriving at Deep-sea Hydrothermal Vents and Identification of the Residues Responsible for Its Heat Stability. Journal of Biological Chemistry (JBC). 2016; 291:15551pp-15563pp. © the American Society for Biochemistry and Molecular Biology. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/66755 |
| Appears in Collections: | 水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 井上 晶
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