Cloning, expression, and biological activity of growth hormone in bullfrog ( Rana catesbeiana)

The cDNA (GenBank, AY251538) encoding bullfrog growth hormone (fGH) was cloned by RT-PCR from the total RNA of pituitary glands. Its sequence encoded a putative polypeptide of 215 amino acids, including a signal peptide of 25 amino acids with no change to those of other previous reported bullfrog GH...

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Veröffentlicht in:General and comparative endocrinology 2006-05, Vol.146 (3), p.296-303
Hauptverfasser: Yu, Lin, Chen, Xiaomei, Liu, Shigui, Long, Zhangfu
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Chen, Xiaomei
Liu, Shigui
Long, Zhangfu
description The cDNA (GenBank, AY251538) encoding bullfrog growth hormone (fGH) was cloned by RT-PCR from the total RNA of pituitary glands. Its sequence encoded a putative polypeptide of 215 amino acids, including a signal peptide of 25 amino acids with no change to those of other previous reported bullfrog GHs. The fGH precursor shares 98.1, 96.3, and 95.3% homologies to those of other bullfrog GHs (AAB24792, AAB19428, CAA31038) in amino-acid sequence and its nucleotide sequences of the coding region shares 99.1 and 98.5% homologies to those of previous bullfrog GH genes (S52027 and X12520). The fGH cDNA was also efficiently expressed in Escherichia coli carrying a plasmid pGfGH in which the cDNA was under the control of GST promoter of pGEX1-λT. The expressed fusion protein GST-fGH is comprised about 29.3% of the total cellular protein in such bacteria. The purified GST-fGH cannot only showed a obvious dose–response curve when it reacted with the hepatic membrane receptor proteins from bullfrog, but also significantly increased the body weight and length of bullfrog after twice injection and such effects lasted two or three weeks after the last injection with purified GST-fGH.
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Its sequence encoded a putative polypeptide of 215 amino acids, including a signal peptide of 25 amino acids with no change to those of other previous reported bullfrog GHs. The fGH precursor shares 98.1, 96.3, and 95.3% homologies to those of other bullfrog GHs (AAB24792, AAB19428, CAA31038) in amino-acid sequence and its nucleotide sequences of the coding region shares 99.1 and 98.5% homologies to those of previous bullfrog GH genes (S52027 and X12520). The fGH cDNA was also efficiently expressed in Escherichia coli carrying a plasmid pGfGH in which the cDNA was under the control of GST promoter of pGEX1-λT. The expressed fusion protein GST-fGH is comprised about 29.3% of the total cellular protein in such bacteria. 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subjects Amino Acid Sequence
Animals
Biological activity
Bullfrog growth hormone
cDNA cloning
Cloning, Molecular
Escherichia coli
Expression
Glutathione Transferase - genetics
Growth Hormone - genetics
Growth Hormone - pharmacology
Molecular Sequence Data
Rana catesbeiana
Rana catesbeiana - growth & development
Recombinant Fusion Proteins - metabolism
Sequence Alignment
title Cloning, expression, and biological activity of growth hormone in bullfrog ( Rana catesbeiana)
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