An alpha-formylglycine building block for fmoc-based solid-phase peptide synthesis.

Area of Science:

• Biochemistry
• Organic Chemistry
• Enzymology

Background:

• Sulfatases are crucial enzymes that catalyze the hydrolysis of sulfate esters.
• Most sulfatases require a unique post-translational modification of cysteine to alpha-formylglycine (afg) at their active site for catalytic activity.
• The synthesis and incorporation of afg into peptides present significant chemical challenges.

Purpose of the Study:

• To develop a novel alpha-formylglycine building block compatible with Fmoc-based solid-phase peptide synthesis (SPPS).
• To demonstrate the utility of this building block by synthesizing a peptide mimicking the active site of a Mycobacterium tuberculosis sulfatase.

Main Methods:

• Chemical synthesis of a protected alpha-formylglycine derivative suitable for Fmoc-SPPS.
• Incorporation of the synthesized building block into a peptide sequence using standard SPPS protocols.
• Characterization of the resulting synthetic peptide.

Main Results:

• Successful synthesis of a stable alpha-formylglycine building block.
• Efficient incorporation of the afg-containing building block into a peptide sequence.
• The synthetic peptide represents a key active site motif of M. tuberculosis sulfatase.

Conclusions:

• The developed alpha-formylglycine building block is a valuable tool for synthetic chemists.
• This methodology facilitates the study of sulfatase mechanisms and the development of sulfatase inhibitors.
• Enables the creation of modified peptides for biochemical and structural studies of sulfatases.