Solid-Phase Synthesis of an “Inaccessible” hGH-Derived Peptide Using a Pseudoproline Monomer and SIT-Protection for Cysteine

Posted on 06.08.2022 - 00:00
The solid-phase peptide synthesis (SPPS) of the C-terminal sequence of hGH with one extra Tyr attached to its N-terminus (total of 16 residues with a disulfide bridge) has been accomplished for the first time by optimizing several synthetic parameters. First of all, the two Ser residues (positions 9 and 13 of the molecule) have been introduced as a single amino acid, Fmoc-Ser­(ψMe,Mepro)-OH, demonstrating that the acylation of these hindered moieties is possible. This allows us to avoid the use of the corresponding dipeptides, Fmoc-AA-Ser­(ψMe,Mepro)-OH, which are very often not commercially available or very costly. The second part of the sequence has been elongated via a double coupling approach using two of the most effective coupling methods (DIC-OxymaPure and HATU-DIEA). Finally, the disulfide bridging has been carried out very smoothly by a chemoselective thiol-disulfide interchange reaction between a SIT (sec-isoamyl mercaptan)-protected Cys residue and the free thiol of the second Cys. The synthesis of this short peptide has evidenced that SPPS is a multifactorial process which should be optimized in each case.

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Manne, Srinivasa Rao; Chakraborty, Amit; Rustler, Karin; Bruckdorfer, Thomas; de la Torre, Beatriz G.; Albericio, Fernando (2022): Solid-Phase Synthesis of an “Inaccessible” hGH-Derived Peptide Using a Pseudoproline Monomer and SIT-Protection for Cysteine. ACS Publications. Collection. https://doi.org/10.1021/acsomega.2c03261
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