Optimization of protein UFMylation modification method and its application in substrate identification in human cells

Area of Science:

• Biochemistry and Molecular Biology
• Cellular Biology
• Biomedical Research

Background:

• UFMylation is a vital post-translational modification regulating cellular processes.
• Dysregulation of UFMylation is linked to diseases, including cancers and developmental disorders.
• Efficient detection of UFMylated proteins is currently a significant challenge.

Purpose of the Study:

• To develop an efficient and specific method for detecting UFMylated substrate proteins.
• To establish a reliable cellular model for UFMylation research.
• To facilitate the large-scale enrichment and identification of UFMylated substrates.

Main Methods:

• Generation and validation of a UFM1-specific proteases knockout (UFSP1^KO/UFSP2^KO) HEK293T cell line.
• Exogenous expression of UFM1-specific ligase 1 (UFL1) and DDRGK domain-containing protein 1 (DDRGK1) to enhance UFMylation.
• Utilizing the developed cell line and expression system for screening and identifying UFMylated substrates.

Main Results:

• The UFSP1^KO/UFSP2^KO HEK293T cell line was validated as an optimal model for UFMylated substrate detection.
• Enhanced expression of UFL1 and DDRGK1 significantly increased protein UFMylation levels.
• A more efficient, specific, and reliable method for UFMylation substrate research was established.

Conclusions:

• The developed method provides a powerful tool for identifying UFMylated proteins.
• This advancement will accelerate research into the biological functions and regulatory mechanisms of UFMylation.
• Facilitates deeper understanding of UFMylation's role in disease progression and potential therapeutic targets.