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Pufferfish Saxitoxin and Tetrodotoxin Binding Protein (PSTBP) Analogues in the Blood Plasma of the Pufferfish Arothron nigropunctatus , A. hispidus , A. manilensis , and Chelonodon patoca .
Marine Drugs 2018 June 30
Pufferfish saxitoxin and tetrodotoxin (TTX) binding protein (PSTBP) is a glycoprotein that we previously isolated from the blood plasma of the pufferfish Takifugu pardalis ; this protein was also detected in seven species of the genus Takifugu . We proposed that PSTBP is a carrier protein for TTX in pufferfish; however, PSTBP had not yet been found in genera other than Takifugu . In this study, we investigated the presence of PSTBP-like proteins in the toxic pufferfish Arothron nigropunctatus , A. hispidus , A. manilensis , and Chelonodon patoca . On the basis of ultrafiltration experiments, TTX was found to be present and partially bound to proteins in the plasma of these pufferfish, and Western blot analyses with anti-PSTBP antibody revealed one or two bands per species. The observed decreases in molecular mass following deglycosylation with glycopeptidase F suggest that these positive proteins are glycoproteins. The molecular masses of the deglycosylated proteins detected in the three Arothron species were larger than that of PSTBP in the genus Takifugu , whereas the two bands detected in C. patoca had molecular masses similar to that of tributyltin-binding protein-2 (TBT-bp2). The N -terminal amino acid sequences of 23⁻29 residues of these detected proteins were all homologous with those of PSTBP and TBT-bp2.
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