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Homo sapiens 239FB and related proteins, metallophosphatase domain 239FB (Fetal brain protein 239) is thought to play a role in central nervous system development, but its specific role in unknown. 239FB is expressed predominantly in human fetal brain from a gene located in the chromosome 11p13 region associated with the mental retardation component of the WAGR (Wilms tumor, Aniridia, Genitourinary anomalies, Mental retardation) syndrome. Orthologous brp-like (brain protein 239-like) proteins have been identified in the invertebrate amphioxus group and in vertebrates. 239FB 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.",