Abstract
Three methods for extraction and preparation of high-quality proteins from both toxic and non-toxic dinoflagellates for proteomics analysis, including Trizol method, Lysis method and Tris method, were compared with the subsequent protein separation profiles using 2-D differential gel electrophoresis (2-D DIGE), Coomassie Blue and silver staining. These methods showed suitability for proteins with different pIs and molecular weights. Tris method was better for low molecular weight and low pI protein isolation; whereas both Lysis and Trizol method were better for high-molecular weight and high pI protein purification. Trizol method showed good results with Alexandrium species and Gynodinium species, and the background in gel was much clearer than the other two methods. At the same time, only Lysis method caused breaking down of the target proteins. On the other hand, Trizol method obtained higher concentration of ribulose-1,5-bisphosphate carboxylase/oxygenase proteins by Western-blotting, while Tris method was the best for peridinin-chlorophyll-protein complexes protein and T1 protein preparation. DIGE was better than Coomassie Blue and silver staining, except for some limitations, such as the high cost of the dyes, relatively short shelf life and the requirements for extensive and special image capturing equipment. Some proteins related to PSTs synthesis in dinoflagellates are hydrophobic with high molecular weight or binding on membranes and Trizol method performed better than Tris method for these proteins. The Trizol method and 2-D DIGE were effective combination for proteomics investigations of dinoflagellates. This procedure allows reliable and high recovery efficiency of proteins from dinoflagellates for better understanding on their occurrence and toxin-production for physiological and biochemical information.
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Acknowledgments
This research was supported by Hong Kong RGC CERG grant HKU765507M and PhD studentships from The University of Hong Kong. We are grateful to the laboratory assistance and support from Miss Jessie Lai.
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Xi-Wen Jiang and Jing Wang have contributed equally to this paper.
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Jiang, XW., Wang, J., Chan, L.L. et al. Comparison of three protein extraction procedures from toxic and non-toxic dinoflagellates for proteomics analysis. Ecotoxicology 24, 1395–1406 (2015). https://doi.org/10.1007/s10646-015-1514-9
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DOI: https://doi.org/10.1007/s10646-015-1514-9