Like Sex Four 2 (LSF2)

LSF2 (Like Sex Four 2) is a dual-specificity phosphoglucan phosphatase that plays a vital role in the diurnal regulation of starch degradation. It specifically targets and removes phosphate groups from the C3-position of glucose moieties within starch granules, a process that is essential for making the starch surface accessible to hydrolytic enzymes like amylases. While LSF2 is a plant-derived enzyme, it serves as a critical structural and functional model for the human protein Laforin, which is implicated in the fatal neurodegenerative condition Lafora disease. In biotechnology, LSF2 is studied both for its potential to optimize starch content in agricultural crops and as a template for developing therapeutic dephosphorylating agents. Recent drug development efforts have focused on using LSF2-related mechanisms to design antibody-enzyme fusions that can clear toxic glycogen aggregates in the brain, offering a potential treatment path for glycogen storage diseases.

Other names

Phosphoglucan phosphatase LSF2Like-SEX4 2At3g10940Starch-excess 4-like protein 2

LSF2 specifically dephosphorylates the C3-position of glucosyl residues in starch and glycogen, facilitating the breakdown of these insoluble polymers into soluble sugars by amylases.