S-Protected Cysteine Sulfoxide-Enabled Tryptophan-Selective Modification with Application to Peptide Lipidation

Area of Science:

• Medicinal Chemistry
• Biotechnology
• Endocrinology

Background:

• Peptide lipidation enhances therapeutic potential by improving stability and bioavailability.
• Current lipidation methods can be complex and lack selectivity.
• Targeting tryptophan residues offers a specific site for modification.

Purpose of the Study:

• To develop a novel, late-stage, tryptophan-selective peptide lipidation protocol.
• To evaluate the therapeutic efficacy of lipidated peptides in vivo.

Main Methods:

• Developed a C-H sulfenylation protocol using S-p-methoxybenzyl cysteine sulfoxide.
• Applied the protocol for late-stage lipidation of peptides, including glucagon-like peptides.
• Conducted oral glucose tolerance tests in wild-type mice.

Main Results:

• Successfully achieved tryptophan-selective peptide lipidation using the novel protocol.
• Demonstrated successful lipidation of glucagon-like peptides.
• Lipidated peptides showed enhanced insulin secretion and prolonged blood-glucose-lowering effects compared to nonlipidated counterparts.

Conclusions:

• The developed protocol enables efficient and selective late-stage peptide lipidation.
• Lipidated peptides exhibit improved pharmacokinetic and pharmacodynamic profiles.
• This method holds significant potential for developing enhanced peptide therapeutics.