Chemical synthesis of per-selenocysteine human epidermal growth factor

Takei, Toshiki; Tanaka, Hideaki; Okumura, Nobuaki; Takao, Toshifumi; Moroder, Luis; Hojo, Hironobu

doi:10.1002/psc.3464

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Chemical synthesis of per-selenocysteine human epidermal growth factor

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Moroder, Luis
Moroder, Luis / Bioorganic Chemistry, Max Planck Institute of Biochemistry, Max Planck Society;

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Citation

Takei, T., Tanaka, H., Okumura, N., Takao, T., Moroder, L., & Hojo, H. (2023). Chemical synthesis of per-selenocysteine human epidermal growth factor. Journal of Peptide Science, 29(5): e15931. doi:10.1002/psc.3464.

Cite as: https://hdl.handle.net/21.11116/0000-000C-2B93-E

Abstract

Human seleno-epidermal growth factor (seleno-EGF), a 53-residue peptide where all six cysteine residues of the parent human EGF sequence were replaced by selenocysteines, was synthesized and the oxidative folding of a polypeptide containing three diselenide bonds was compared to that of the parent cysteine peptide. The crude high performance liquid chromatography (HPLC) profiles clearly showed that both the native EGF and its selenocysteine-analogue fold smoothly, yielding a single sharp peak, proving that even in the case of three disulfide-bonded polypeptides the disulfide-to-diselenide bond substitution is highly isomorphous, as confirmed by conformational circular dichroism measurements and particularly by the biological assays.