Golgi phosphoprotein 3

Golgi phosphoprotein 3 (GOLPH3) is a phosphatidylinositol-4-phosphate-binding protein that functions as a linker between Golgi membranes and the cytoskeleton (UniProt: Q9H4A6). It participates in vesicle budding, Golgi trafficking, and anterograde transport to the plasma membrane, while also modulating mTOR signaling and mitochondrial lipid biosynthesis. The protein localizes to the Golgi apparatus where it regulates membrane dynamics and secretion.

GOLPH3 is expressed in human Golgi compartments and associated trafficking pathways. No disease associations are documented in UniProt's curated disease database; however, emerging proteomic evidence suggests dysregulation in neurodegenerative conditions.

In Alzheimer's Disease, GOLPH3 is significantly upregulated in post-mortem AD brain tissue compared to age-matched controls (Chaparral AD proteomics: mean log2FC = 0.35, TMT-labeled DDA proteomics across subcellular fractions). This elevation may reflect compensatory responses to impaired Golgi-mediated trafficking or altered secretion pathways characteristic of AD pathology.