Development of a selective activity-based probe for glycosylated LIPA

Area of Science:

• Biochemistry
• Cell Biology
• Genetic Diseases

Background:

• Lysosomal acid lipase (LIPA) deficiency causes severe metabolic disorders, including Wolman's Disease and Cholesterol Ester Storage Disease.
• Current methods assess LIPA protein levels, but direct measurement of LIPA enzyme activity within cells remains challenging.
• The role of LIPA glycosylation in its activity and cellular function is not well understood.

Purpose of the Study:

• To develop and validate a novel activity-based probe for the direct measurement of LIPA enzyme activity in cellular environments.
• To investigate the specificity of the probe towards glycosylated forms of LIPA.

Main Methods:

• Design and synthesis of a LIPA-specific activity-based probe.
• Application of the probe to assess LIPA activity in cellular models.
• Testing the probe's reactivity with purified LIPA, considering glycosylation status.

Main Results:

• A novel LIPA-specific activity-based probe was successfully developed.
• The probe enables direct measurement of LIPA activity within cells.
• The probe demonstrates specificity for a glycosylated form of LIPA in cellular contexts, while also labeling purified LIPA irrespective of glycosylation.

Conclusions:

• The developed probe provides a valuable tool for directly assessing LIPA activity in cells.
• This advancement can improve the diagnosis and study of LIPA deficiency disorders.
• Further research can explore the impact of glycosylation on LIPA function using this probe.