Protoplast Preparation from <Emphasis Type="Italic">Laminaria japonica</Emphasis> with Recombinant Alginate Lyase and Cellulase |
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Authors: | Akira Inoue Chieco Mashino Teina Kodama Takao Ojima |
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Institution: | (1) Laboratory of Marine Biotechnology and Microbiology, Graduate School of Fisheries Sciences, Hokkaido University, Hakodate Hokkaido, 041-8611, Japan; |
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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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