. "FUNCTION: Non-receptor tyrosine-protein kinase that negatively regulates cell proliferation. Positively regulates PTEN protein stability through phosphorylation of PTEN on 'Tyr-336', which in turn prevents its ubiquitination and degradation, possibly by reducing its binding to NEDD4. May function as a tumor suppressor. CATALYTIC ACTIVITY: ATP + a [protein]-L-tyrosine = ADP + a [protein]-L-tyrosine phosphate. SUBUNIT: Interacts (via the SH3-domain) with PTEN. Interacts with RB1. SUBCELLULAR LOCATION: Cytoplasm. Nucleus. Note=Predominantly found in the nucleus, with a small fraction found in the cell periphery. TISSUE SPECIFICITY: Predominantly expressed in epithelial derived cell lines and tissues, especially normal liver, kidney, breast and colon. SIMILARITY: Belongs to the protein kinase superfamily. Tyr protein kinase family. SRC subfamily. SIMILARITY: Contains 1 protein kinase domain. SIMILARITY: Contains 1 SH2 domain. SIMILARITY: Contains 1 SH3 domain. GENE SYNONYMS:FRK PTK5 RAK. COPYRIGHT: Protein annotation is derived from the UniProt Consortium (http://www.uniprot.org/). Distributed under the Creative Commons Attribution-NoDerivs License."^^ . "SEQUENCE 505 AA; 58254 MW; 06EC050DDBCD930B CRC64;"^^ . . . . . . . "FRK_HUMAN"^^ . "2.7.10.2"^^ . "FRK"^^ . "FYN-related kinase"^^ . "Nuclear tyrosine protein kinase RAK"^^ . "Protein-tyrosine kinase 5"^^ . . . . . . . "MSNICQRLWEYLEPYLPCLSTEADKSTVIENPGALCSPQSQRHGHYFVALFDYQARTAEDLSFRAGDKLQVLDTLHEGWWFARHLEKRRDGSSQQLQGYIPSNYVAEDRSLQAEPWFFGAIGRSDAEKQLLYSENKTGSFLIRESESQKGEFSLSVLDGAVVKHYRIKRLDEGGFFLTRRRIFSTLNEFVSHYTKTSDGLCVKLGKPCLKIQVPAPFDLSYKTVDQWEIDRNSIQLLKRLGSGQFGEVWEGLWNNTTPVAVKTLKPGSMDPNDFLREAQIMKNLRHPKLIQLYAVCTLEDPIYIITELMRHGSLQEYLQNDTGSKIHLTQQVDMAAQVASGMAYLESRNYIHRDLAARNVLVGEHNIYKVADFGLARVFKVDNEDIYESRHEIKLPVKWTAPEAIRSNKFSIKSDVWSFGILLYEIITYGKMPYSGMTGAQVIQMLAQNYRLPQPSNCPQQFYNIMLECWNAEPKERPTFETLRWKLEDYFETDSSYSDANNFIR"^^ . "Tyrosine-protein kinase FRK"^^ .