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PKC mu is a novel member of the subgroup of atypical protein kinase Cs (PKC). Deduced protein sequence shows strong homology to conserved domains of members of the PKC subfamily. In vitro phorbol ester binding studies and kinase assays with lysates of cells overexpressing PKC mu showed phorbol ester-independent kinase activity, autophosphorylation, and, in normal rat kidney (NRK) cells, predominant phosphorylation of a 30-kDa protein at serine residues. Data suggest a role of PKC mu in signal transduction pathways related to growth control (1). PKC mu is a cytosolic protein, which upon binding to the trans-Golgi network (TGN) regulates the fission of transport carriers specifically destined to the cell surface. (2). Results demonstrate that betagamma subunits of the heterotrimeric G proteins directly activates PKD by interacting with its pleckstrin homology domain (3).
