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P55 is an extensively palmitoylated erythrocyte membrane protein, and a member of the MAGUK family. P55 also resists salt extraction, resulting in a high affinity for the plasma membrane. P55 contains a PDZ/DHR domain, a conserved SH-3 domain that appears to suppress tyrosine kinase activity of various oncoproteins, a 39-amino acid motif that binds to cytoskeletal protein 4.1R, and a guanylate kinase-like domain. Interaction with glycophorin C (GPC) and 4.1R suggests that p55 may play a role in the dynamic regulation in the erythrocyte membrane. In addition, p55 gene expression in vivo may be associated with a CpG island. P55 is constitutively expressed in K562 erythroleukemia cells during erythropoiesis and undergoes a 2-fold amplification after induction.
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Protein Aliases: DDB1- and CUL4-associated factor 1; HIV-1 Vpr-binding protein; protein VPRBP; Serine/threonine-protein kinase VPRBP; Vpr (HIV-1) binding protein; Vpr-binding protein; Vpr-interacting protein; VprBP
Gene Aliases: AI447437; B930007L02Rik; DCAF1; KIAA0800; mKIAA0800; RGD1305176; RIP; VPRBP
UniProt ID: (Human) Q9Y4B6, (Mouse) Q80TR8
Entrez Gene ID: (Human) 9730, (Rat) 315987, (Mouse) 321006
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