Characterization and molecular docking of new Δ17 fatty acid desaturase genes from Rhizophagus irregularis and Octopus bimaculoides
| Autor: | Jianxin Zhao, Yong Q. Chen, Zhennan Gu, Wei Chen, Hao Zhang, Xin Tang, Chunchi Rong, Haiqin Chen |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Rhizophagus irregularis biology General Chemical Engineering Saccharomyces cerevisiae 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology biology.organism_classification 01 natural sciences Eicosapentaenoic acid 0104 chemical sciences chemistry.chemical_compound Fatty acid desaturase chemistry Biochemistry Biosynthesis Docosahexaenoic acid biology.protein lipids (amino acids peptides and proteins) 0210 nano-technology Gene Polyunsaturated fatty acid |
| Zdroj: | RSC Advances. 9:6871-6880 |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/c9ra00535h |
| Popis: | Fatty acid desaturases are key enzymes in the biosynthesis of n-3 polyunsaturated fatty acids (PUFAs) via conversion of n-6 polyunsaturates to their n-3 counterparts. In this study, we reported the characterization and molecular docking of Δ17 desaturases from Rhizophagus irregularis and Octopus bimaculoides. These two new desaturase genes were screened using the known Δ17 desaturase gene (oPaFADS17) from Pythium aphanidermatum as a template. Analysis of their genes revealed that the sequences of oRiFADS17 and oObFADS17 contained the typical His-rich motifs (one HXXXH and two HXXHH). They were then expressed in Saccharomyces cerevisiae INVSc1 to examine their activities and substrate preferences. Our results show that the two candidate n-3 desaturases possess a strong Δ17 desaturase activity, exhibiting remarkable increase in desaturation activity on C20 fatty acids compared to C18 fatty acids. To the best of our knowledge, oRiFADS17 desaturase has greater (3–4 fold) catalytic activity for C18 substrates than other reported Δ17 desaturases and oObFADS17 is the first reported Δ17 desaturase in sea mollusks. Characterization of these two new desaturases will be of greater value for genetic engineering in industrial production of eicosapentaenoic acid (EPA, C20:5n-3) and docosahexaenoic acid (DHA, C22:6n-3). Due to lack of crystal structure information about n-3 desaturases, for the first time, the view of their predicted structures, binding pockets and substrate tunnels was clearly observed based on molecular docking. This will contribute to strengthening our understanding of the structure–function relationships of n-3 fatty acid desaturases. |
| Databáze: | OpenAIRE |
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