Purification and identification of a tributyltin-binding protein from serum of Japanese flounder, Paralichthys olivaceus

Yohei Shimasaki, Yuji Oshima, Yoshiko Yokota, Takeshi Kitano, Miki Nakao, Shun Ichiro Kawabata, Nobuyoshi Imada, Tsuneo Honjo

研究成果: ジャーナルへの寄稿学術誌査読

33 被引用数 (Scopus)


Tributyltin (TBT) is an industrial chemical used as an antifoulant in marine environments. Previously, we reported that TBT accumulates in the serum or plasma of some fishes and is bound to a high molecular weight compound in the serum of the Japanese flounder Paralichthys olivaceus. In this study, we succeeded in purifying the TBT-binding protein (TBT-bp) from the serum of Japanese flounder by using gel filtration chromatography, anion exchange chromatography, and polyacrylamide gel electrophoresis, with a 2.6% yield and a 77-fold purification. The molecular mass of TBT-bp was approximately 46.5 kDa on sodium dodecyl sulfate-polyacrylamide gel electrophoresis, and its isoelectric point was approximately 3.0 on isoelectric focusing-polyacrylamide gel electrophoresis. The TBT-bp contained 42% N-glycan. The cDNA nucleotide sequence of TBT-bp was determined by reverse transcription-polymerase chain reaction of Japanese flounder liver, and we deduced a sequence of 191 amino acids of mature TBT-bp. No sequence identical to the TBT-bp amino acid sequence was found within the SWISS-PROT (http://www.nig. ac.jp/) protein database; however, a lipocalin-like sequence pattern was observed. We concluded that the TBT-bp was a novel protein that has not yet been reported, although some DNA sequences from expressed sequence tags (ESTs) of Japanese flounder liver had a high identity. A high expression level of TBT-bp gene was found in the liver, but the gene was slightly detectable in the kidney and brain.

ジャーナルEnvironmental Toxicology and Chemistry
出版ステータス出版済み - 1月 1 2002

!!!All Science Journal Classification (ASJC) codes

  • 環境化学
  • 健康、毒物学および変異誘発


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