Vacuolar protein sorting-associated protein 29

Vacuolar protein sorting-associated protein 29 (VPS29) is a core component of the commander and retriever complexes, which mediate endosomal recycling and retrograde transport of transmembrane cargos including integrins and the polymeric immunoglobulin receptor (UniProt: Q9UBQ0). The protein functions within retromer complex variants to prevent missorting of cargo proteins into the lysosomal degradation pathway, with roles in endosome-to-plasma membrane trafficking and GLUT1 recycling dependent on association with ANKRD27 (UniProt: Q9UBQ0).

VPS29 is implicated in Alzheimer's Disease based on Chaparral AD proteomics data. Analysis of human post-mortem AD brain tissue versus age-matched controls using TMT-labeled tandem mass spectrometry across four subcellular fractions (P2, P3, S2, S3) revealed an ambiguous direction of regulation with a mean log2 fold-change of −0.28 (Chaparral AD proteomics). The inconsistent directionality across fractions suggests compartment-specific alterations in VPS29 levels that warrant further investigation in the context of endosomal-lysosomal dysfunction in neurodegeneration.