Establishment of an isolation method of Nostoc commune cells free from extracellular polysaccharides (EPS) using Percoll centrifugation
The terrestrial cyanobacterium Nostoc commune Vaucher ex Bornet et Flahault occurs worldwide, including in Japan and Antarctica. N. commune has a large amount of extracellular polysaccharides (EPS) that hold moisture and protect the cells and at the same time accumulate light-blocking substances whi...
| Main Authors: | , , , |
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| Format: | Article in Journal/Newspaper |
| Language: | English Japanese |
| Published: |
National Institute of Polar Research
2012
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| Subjects: | |
| Online Access: | https://doi.org/10.15094/00009663 https://doaj.org/article/3daea65796cb4f28be781dab5787f454 |
| Summary: | The terrestrial cyanobacterium Nostoc commune Vaucher ex Bornet et Flahault occurs worldwide, including in Japan and Antarctica. N. commune has a large amount of extracellular polysaccharides (EPS) that hold moisture and protect the cells and at the same time accumulate light-blocking substances which is believed to play an important part in adaptation to a severe environment. To evaluate the photoadaptation processes in N. commune and clarify the role(s) of EPS under ambient environmental condition at Antarctica, separation of cells from EPS is necessary. High yield is a prerequisite for the use of only small amount of natural N. commune from Antarctica. For this purpose, we developed a separation method by improving the Percoll density gradient centrifugation method using an EPS-coated field-grown Nostoc population. We established the most suitable condition to separate naked cells from EPS at high yield retaining high photosynthetic activity. The method is composed of centrifugation of cell homogenated N. commune in 10% (v/v) Percoll to separate cells efficiently from EPS followed by fractionating centrifugation to remove impurities using the gradient of Percoll (80% and 50%, v/v). |
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