Protein splicing mechanisms and applications

Area of Science:

• Biochemistry
• Molecular Biology
• Protein Engineering

Background:

• Inteins are protein splicing elements that excise themselves from precursor proteins.
• They ligate flanking protein sequences (exteins) through a series of nucleophilic displacements.
• Intein active sites are formed by the folding of the intein within the precursor protein.

Purpose of the Study:

• To elucidate the catalytic mechanisms of inteins in protein splicing.
• To explore novel applications stemming from intein-mediated proteolytic cleavage and ligation.
• To highlight recent advancements in intein technology.

Main Methods:

• Analysis of intein-mediated protein splicing pathways.
• Investigation of intein catalytic residues and their role in modified splicing pathways.
• Development of intein-based applications in protein engineering and biotechnology.

Main Results:

• Protein splicing involves four nucleophilic displacements, directed by the intein and the first C-extein residue.
• Non-canonical catalytic residues lead to modified intein splicing pathways.
• Intein activity has been harnessed for protein attachment, nucleic acid-protein linking, and controllable molecular switches.

Conclusions:

• Understanding intein catalysis is crucial for developing advanced protein engineering tools.
• Inteins offer versatile applications, including microarray analysis, target detection, and transgene activation.
• Controllable intein splicing represents a significant advancement in molecular switch technology.