MUC1 is a member of the mucin family and encodes a membrane bound, glycosylated phosphoprotein. This latter enzyme is itself activated by protein kinase A and deactivated by phosphoprotein phosphatase-1. UBF is a nucleolar phosphoprotein with both DNA binding and transactivation domains. Dsh (Dvl in mammals) is a cytoplasmic phosphoprotein that acts directly downstream of frizzled receptors. Nucleolin (NCL), a eukaryotic nucleolar phosphoprotein, is involved in the synthesis and maturation of ribosomes. COX4I1 has a transit peptide domain and acetyl and phosphoprotein amino acid modifications. This phosphoprotein is as an endogenous substrate bound to the vesicular membrane. Vif was considered as a phosphoprotein and phosphorylation seemed to be required for viral infectivity. ATP + a target protein formula 3 ADP + a phosphoprotein. P24 (phosphoprotein 24) is an essential component of the RNA polymerase transcription and replication complex. BCS1L is a phosphoprotein and chaperone for Ubiquinol Cytochrome c Reductase assembly. Associated with the nucleocapsid are copies of P (phosphoprotein) and L (large) protein. Coilin has been shown to interact with ataxin 1, nucleolar phosphoprotein p130, SMN, and SNRPB. Synonyms for this protein include sialoprotein I and 44K BPP (bone phosphoprotein). Casein is the predominant phosphoprotein found in fresh milk.