Mucus Glycoproteins Selectively Secreted from Bacteriocytes in Gill Filaments of the Deep-Sea Clam <i>Calyptogena okutanii</i> — Oak Academic Publishing
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Mucus Glycoproteins Selectively Secreted from Bacteriocytes in Gill Filaments of the Deep-Sea Clam <i>Calyptogena okutanii</i>
Institute of Biogeoscience (Biogeos), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan
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Institute of Biogeoscience (Biogeos), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan
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Institute of Biogeoscience (Biogeos), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan
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Institute of Biogeoscience (Biogeos), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan
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Marine Works Japan, Ltd., Yokosuka, Japan
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Institute of Biogeoscience (Biogeos), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan
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Institute of Biogeoscience (Biogeos), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan
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School of Medicine, Yokohama City University, Yokohama, Japan
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Graduate School of Science and Engineering, Yamaguchi University, Yamaguchi, Japan
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Institute of Biogeoscience (Biogeos), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan
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Institute of Biogeoscience (Biogeos), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan
1 Institute of Biogeoscience (Biogeos), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan
2 Institute of Biogeoscience (Biogeos), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan
3 Institute of Biogeoscience (Biogeos), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan
4 Institute of Biogeoscience (Biogeos), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan
5 Marine Works Japan, Ltd., Yokosuka, Japan
6 Institute of Biogeoscience (Biogeos), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan
7 Institute of Biogeoscience (Biogeos), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan
8 School of Medicine, Yokohama City University, Yokohama, Japan
9 Graduate School of Science and Engineering, Yamaguchi University, Yamaguchi, Japan
10 Institute of Biogeoscience (Biogeos), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan
11 Institute of Biogeoscience (Biogeos), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan
The deep-sea clam Calyptogena okutanii possesses a large gill containing vertically transmitted symbiotic sulfur-oxi dizing bacteria. It produces large amounts of highly viscoelastic mucus from the gill, which is thought to be a physical and chemical barrier. The mucus collected from the gill was shown to be composed of glycoproteins having the follow ing sugar composition: Man (17.4%), GlcNAc (16.6%), GalNAc (15%), Glc (1.1%), Gal (29.9%), Xyl (3.0%), Fuc (14.4%), and unknown (2.6%), indicating that it contained mucin-like glycoproteins. In a monoclonal antibody library against the gill tissue, we found a monoclonal antibody (mAb), CokG-B3C10, reacting to the mucus. Western blot ana lysis using the mAb showed that it reacted to several glycoproteins in the mucus from the gill tissue, but not with those of other tissues such as the mantle, foot, and ovary, where mucus production has been reported in bivalves. Further, immunohistochemical analysis showed the CokG-B3C10 mAb reacting to glycoproteins was detected in the inner area of the gill, which was occupied by many bacteriocytes in the row of gill filaments. Strong mAb signals were found on the outer surface of the bacteriocytes facing the interfilamental space, and in the interfilamental spaces between fila ments. Weaker signals were also observed in the bacteriocyte cells. These results indicate that the CokG-B3C10 mAb binding mucus glycoproteins were produced from cells including bacteriocytes and nonbacteriocyte cells in the inner area of the gill filaments.
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