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Homo sapiens Vps29 and related proteins, metallophosphatase domain Vps29 (vacuolar sorting protein 29), also known as vacuolar membrane protein Pep11, is a subunit of the retromer complex which is responsible for the retrieval of mannose-6-phosphate receptors (MPRs) from the endosomes for retrograde transport back to the Golgi. Vps29 has a phosphoesterase fold that acts as a protein interaction scaffold for retromer complex assembly as well as a phosphatase with specificity for the cytoplasmic tail of the MPR. The retromer includes the following 5 subunits: Vps35, Vps26, Vps29, and a dimer of the sorting nexins Vps5 (Snx1), and Vps17 (Snx2). Vps29 belongs to the metallophosphatase (MPP) superfamily. MPPs are functionally diverse, but all share a conserved domain with an active site consisting of two metal ions (usually manganese, iron, or zinc) coordinated with octahedral geometry by a cage of histidine, aspartate, and asparagine residues. The MPP superfamily includes: Mre11/SbcD-like exonucleases, Dbr1-like RNA lariat debranching enzymes, YfcE-like phosphodiesterases, purple acid phosphatases (PAPs), YbbF-like UDP-2,3-diacylglucosamine hydrolases, and acid sphingomyelinases (ASMases). The conserved domain is a double beta-sheet sandwich with a di-metal active site made up of residues located at the C-terminal side of the sheets. This domain is thought to allow for productive metal coordination. |
Jiyao W et al.(2023). "The conserved domain database in 2023.",