A small molecule that inhibits OGT activity in cells

Area of Science:

• Biochemistry
• Molecular Biology
• Glycobiology

Background:

• O-GlcNAc transferase (OGT) is crucial for cellular processes, modifying nuclear and cytoplasmic proteins.
• Understanding O-GlcNAc modification is limited, necessitating tools to study OGT.
• OGT is a potential therapeutic target, requiring validated inhibitors.

Purpose of the Study:

• To develop a cell-permeable inhibitor for O-GlcNAc transferase (OGT).
• To provide a research tool for studying O-GlcNAc modification.
• To validate OGT as a therapeutic target.

Main Methods:

• High-throughput screening to identify initial hits.
• Chemical synthesis and optimization of small molecules.
• Cell-based assays to assess OGT inhibition and cell permeability.

Main Results:

• OSMI-1, a novel small molecule inhibitor of OGT, was identified and developed.
• OSMI-1 is cell-permeable and effectively inhibits protein O-GlcNAcylation in mammalian cells.
• The inhibitor did not alter cell surface N- or O-linked glycans.

Conclusions:

• OSMI-1 is a valuable tool for investigating OGT biology and O-GlcNAc modification.
• High-throughput screening is effective for discovering glycosyltransferase inhibitors.
• Further optimization of OSMI-1 may yield potent inhibitors for animal studies.