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Preparation of protoplasts from Laminaria japonica using native and recombinant abalone alginate lyases

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Abstract

Laminaria japonica protoplasts were released with high yields using the abalone alginate lyase HdAly in combination with a cellulase and chelating agents. Addition of EDTA at concentrations higher than 10 mM to Laminaria thalli which had been preincubated with HdAly and Cellulase Onozuka, dramatically improved the yield of protoplasts. EDTA was far more effective than EGTA, indicating that chelating divalent metal ions such as Mg2+ and Sr2+ in addition to Ca2+ is a key factor for high-yield production of Laminaria protoplasts. Protoplasts had a mean diameter of 27 μm, suggesting that most protoplasts were derived from cortical cells rather than epidermal layer cells. Recombinant HdAly (rHdAly) was produced from a cDNA clone in the Sf9 insect cell expression system. rHdAly had substantially the same enzymatic properties and protoplast-producing ability as did native HdAly. The optimal conditions for high yield production of protoplasts from Laminaria using native and recombinant HdAlys were investigated.

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Acknowledgments

This work was supported by a Grant-in-Aid for Young Scientists (B), No. 17780164, and a 21st century COE program grant of the international COE of "Marine Bio-Manipulation Frontier for Food Production" both from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan, and the Akiyama Foundation.

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  1. Laboratory of Marine Biotechnology and Microbiology, Graduate School of Fisheries Sciences, Hokkaido University, 3-1-1 Minato-cho, Hakodate, Hokkaido, 041-8611, Japan

    Akira Inoue, Mayu Kagaya & Takao Ojima

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  1. Akira Inoue
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  2. Mayu Kagaya
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  3. Takao Ojima
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Correspondence to Takao Ojima.

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Inoue, A., Kagaya, M. & Ojima, T. Preparation of protoplasts from Laminaria japonica using native and recombinant abalone alginate lyases. J Appl Phycol 20, 633–640 (2008). https://doi.org/10.1007/s10811-007-9199-y

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  • DOI: https://doi.org/10.1007/s10811-007-9199-y

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