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Protoplast Preparation from Laminaria japonica with Recombinant Alginate Lyase and Cellulase

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Abstract

Functional recombinant abalone alginate lyase (rHdAly) and β-1,4-endoglucanase (rHdEG66) were expressed as secreted proteins with baculoviral expression systems. The specific activity of each recombinant enzyme, 2,490 and 18.2 U/mg for rHdAly and rHdEG66, respectively, was comparable to its native form at 30°C. Purified rHdAly and rHdEG66 showed the highest specific activity both at 35°C and optimum pH 8.7 and 5.9, respectively. These properties were also comparable to those of the native enzymes. Protoplast isolation was attempted from Laminaria japonica using both rHdAly and rHdEG66. When L. japonica blades were incubated in artificial seawater containing rHdAly and rHdEG66, very low numbers of protoplasts (<1 × 103 protoplasts/g fresh weight) resulted. However, using blades pretreated with proteinase K, the protoplast was increased up to 5 × 106 protoplasts/g fresh weight. Since the average diameter of isolated protoplasts was 11.6 μm, these cells were mostly derived from the epidermal layer rather than the cortical layer. Our results suggest that at least three enzymes, alginate lyase, cellulase, and protease, are essential for effective protoplast isolation from L. japonica. The protoplast isolation method in this study is more useful than earlier methods because it preferentially yielded protoplasts of the epidermal layer, which are known to be able to be regenerated.

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Acknowledgements

This work was supported by a Grant-in-Aid for Young Scientists (B) no. 20780150 from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan and the Akiyama Foundation.

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Authors and Affiliations

  1. Laboratory of Marine Biotechnology and Microbiology, Graduate School of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido, 041-8611, Japan

    Akira Inoue, Chieco Mashino, Teina Kodama & Takao Ojima

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  1. Akira Inoue
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  2. Chieco Mashino
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  3. Teina Kodama
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  4. Takao Ojima
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Correspondence to Takao Ojima.

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Inoue, A., Mashino, C., Kodama, T. et al. Protoplast Preparation from Laminaria japonica with Recombinant Alginate Lyase and Cellulase. Mar Biotechnol 13, 256–263 (2011). https://doi.org/10.1007/s10126-010-9290-2

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  • DOI: https://doi.org/10.1007/s10126-010-9290-2

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