Exploration of the antibacterial proteins in pearl oyster <Emphasis Type="Italic">Pinctada fucata</Emphasis> induced by bacterial inoculation |
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Authors: | Haisheng Lin Shoichiro Ishizaki Yuji Nagashima Kiyohito Nagai Kaoru Maeyama Shugo Watabe |
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Institution: | 1.Graduate School of Marine Science and Technology,Tokyo University of Marine Science and Technology,Minato,Japan;2.College of Food Science and Technology,Guangdong Ocean University,Zhanjiang,China;3.Pearl Research Laboratory, Mikimoto Company Limited,Shima,Japan;4.Mikimoto Pharmaceutical Company Limited,Ise,Japan;5.School of Marine Biosciences,Kitasato University,Sagamihara,Japan |
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Abstract: | The aim of this research was to characterize immune-related antibacterial substances from pearl oyster Pinctada fucata induced by bacterial invasion. Bacteria inoculation was performed by injecting 0.1 ml of 1.0 × 1012 colony-forming units/ml Vibrio parahaemolyticus into adductor muscle. Acidic extracts were prepared with 0.1% trifluoroacetic acid from different tissues after 8 h of injection, and antibacterial activity against V. parahaemolyticus was determined via the microdilution broth method. The acidic extracts from gills of inoculated oysters (AEg) showed stronger antibacterial activity than those from non-inoculated ones. Based on this result, antibacterial proteins were purified from AEg via two-step gel filtration chromatography, followed by high-performance liquid chromatography using a TSkgel G3000 column. Protein components were analyzed by both sodium dodecyl sulfate and native polyacrylamide gel electrophoresis. As a result, two antibacterial proteins, APg-1 (with a molecular mass of approximately 210 kDa) and APg-2 (of approximately 30 kDa), were obtained from AEg. Matrix-assisted laser desorption/ionization time of flight mass spectrometry analysis and partial amino acid sequences revealed that these proteins might be novel antibacterial proteins. These results indicate that antibacterial proteins are potentially upregulated in the gill of pearl oysters or released therefrom for defense against bacterial invasion. |
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