Intein-mediated ligation and cyclization of expressed proteins

Area of Science:

• Biochemistry
• Molecular Biology
• Protein Engineering

Background:

• Protein splicing is a natural posttranslational modification.
• Inteins are internal protein sequences that catalyze their own excision.
• This process ligates flanking extein sequences.

Purpose of the Study:

• To review the chemical steps of protein splicing.
• To describe intein-enabled technologies.
• To explain applications in protein semisynthesis and backbone cyclization.

Main Methods:

• Dissection of the protein splicing pathway.
• Identification of key catalytic residues.
• Modulation of intein activity for protein engineering.

Main Results:

• Intein-catalyzed reactions enable protein and peptide production.
• These methods overcome size limitations of chemical synthesis.
• Intein technology offers a less technically demanding alternative.

Conclusions:

• Self-splicing inteins are powerful tools for protein engineering.
• Intein technology facilitates protein semisynthesis and backbone cyclization.
• Novel strategies expand the utility of inteins in biotechnology.