Two-fold Bioorthogonal Derivatization by Different Formylglycine-Generating Enzymes

Area of Science:

• Bioconjugation Chemistry
• Protein Engineering
• Synthetic Biology

Background:

• Formylglycine-generating enzymes (FGEs) are crucial for site-specific protein modification.
• They convert cysteine to Cα-formylglycine (FGly), a non-canonical amino acid.
• FGly facilitates bioorthogonal conjugation reactions.

Purpose of the Study:

• To explore the distinct recognition sequences of FGE and AtsB.
• To design and implement specific tags for selective FGly introduction.
• To achieve independent and consecutive dual FGly modification in proteins.

Main Methods:

• Design of specific peptide and protein tags.
• Enzymatic conversion using FGE and AtsB.
• Generation of heterobifunctional protein conjugates.

Main Results:

• Demonstrated selective conversion of designed tags by different enzymes.
• Successfully introduced two FGly residues independently and consecutively.
• Created heterobifunctionalized protein conjugates.

Conclusions:

• Engineered tags enable precise control over FGly introduction.
• This method allows for sequential modification of proteins.
• Facilitates advanced bioconjugation strategies and protein functionalization.