Thiazolidine Deprotection Using an Organic Solvent Extractable Aldehyde Scavenger for One-Pot Four-Segment Ligation

Area of Science:

• Chemical Biology
• Synthetic Chemistry
• Biochemistry

Background:

• Peptide synthesis often requires efficient methods for modifying terminal amino acids.
• N-terminal thiazolidine (Thz) is a protecting group used in peptide chemistry.
• Multisegment ligation is crucial for assembling large peptides and proteins.

Purpose of the Study:

• To develop a simple and effective N-terminal thiazolidine (Thz) deprotection strategy.
• To apply this strategy in a one-pot multisegment ligation.
• To demonstrate the utility of the method in assembling a biologically relevant peptide.

Main Methods:

• Utilized O-benzylhydroxylamine (O-BHA) for rapid conversion of Thz to N-terminal cysteine.
• Employed organic solvent extraction for easy separation of O-BHA.
• Performed one-pot multisegment ligation using the developed deprotection strategy.

Main Results:

• Achieved efficient and rapid deprotection of N-terminal Thz to cysteine.
• Successfully prevented degradation of peptide thioesters by O-BHA through extraction.
• Demonstrated the successful assembly of CC chemokine ligand-2 using this one-pot ligation approach.

Conclusions:

• The O-BHA-based strategy offers a convenient method for N-terminal Thz deprotection.
• This approach facilitates efficient one-pot multisegment peptide ligation.
• The method is applicable to the synthesis of complex peptides like CC chemokine ligand-2.