Methods to Study the Structure and Catalytic Activity of cis-Splicing Inteins

Area of Science:

• Biochemistry and Molecular Biology
• Structural Biology

Background:

• Protein splicing is an autocatalytic process mediated by inteins, which excise themselves from precursor proteins and ligate flanking exteins.
• Inteins are crucial for generating reactive intermediates like alpha-thioesters and N-terminal cysteine residues, enabling applications such as expressed protein ligation.
• Understanding intein mechanisms is vital for advancing biotechnology.

Purpose of the Study:

• To provide biochemical methods for studying intein-mediated protein splicing activity.
• To present NMR methods for investigating intein structure and catalytic mechanisms.
• To deepen the understanding of intein function for enhanced biotechnology applications.

Main Methods:

• Biochemical assays to monitor protein splicing activity.
• Nuclear Magnetic Resonance (NMR) spectroscopy to determine intein structure.
• NMR-based studies to elucidate the catalytic mechanism of intein-mediated protein splicing.

Main Results:

• Established robust biochemical protocols for assessing protein splicing efficiency.
• Obtained high-resolution structural data of inteins using NMR.
• Gained insights into the step-by-step catalytic process of protein splicing.

Conclusions:

• The developed methods enable comprehensive analysis of intein function.
• A detailed understanding of intein structure and mechanism facilitates their application in biotechnology.
• This work provides a foundation for engineering inteins with novel functionalities.