HPLC-Based Enzyme Assays for Sirtuins

Area of Science:

• Biochemistry
• Enzymology
• Molecular Biology

Background:

• Sirtuins are NAD+-dependent enzymes regulating critical biological pathways.
• Dysregulation of sirtuin activity is implicated in various human diseases.
• Modulating sirtuin activity holds therapeutic potential.

Purpose of the Study:

• To establish a high-performance liquid chromatography (HPLC)-based protocol for measuring sirtuin enzyme kinetics.
• To accurately determine kinetic parameters (K_m and k_cat) for specific sirtuin activities.

Main Methods:

• Utilized HPLC to quantify enzyme kinetics.
• Employed peptide substrates mimicking physiological substrates for SIRT2, SIRT5, and SIRT6.
• Measured demyristoylase activity for SIRT2 and SIRT6, and desuccinylase activity for SIRT5.

Main Results:

• The developed HPLC method provides reliable kinetic parameters for sirtuin enzymes.
• Peptide substrates yielded accurate K_m and k_cat values.
• The protocol is effective for assessing SIRT2, SIRT5, and SIRT6 activities.

Conclusions:

• This protocol enables precise measurement of sirtuin enzyme kinetics.
• The findings aid in understanding sirtuin biological functions.
• The method supports the development of novel sirtuin-modulating therapeutics.