FAK Non-receptor protein-tyrosine kinase that plays an essential role in regulating cell migration, adhesion, spreading, reorganization of the actin cytoskeleton, formation and disassembly of focal adhesions and cell protrusions, cell cycle progression, cell proliferation and apoptosis. Required for early embryonic development and placenta development. Required for embryonic angiogenesis, normal cardiomyocyte migration and proliferation, and normal heart development. Regulates axon growth and neuronal cell migration, axon branching and synapse formation; required for normal development of the nervous system. Plays a role in osteogenesis and differentiation of osteoblasts. Functions in integrin signal transduction, but also in signaling downstream of numerous growth factor receptors, G-protein coupled receptors (GPCR), EPHA2, netrin receptors and LDL receptors. Forms multisubunit signaling complexes with SRC and SRC family members upon activation; this leads to the phosphorylation of additional tyrosine residues, creating binding sites for scaffold proteins, effectors and substrates. Regulates numerous signaling pathways. Promotes activation of phosphatidylinositol 3-kinase and the AKT1 signaling cascade. Promotes activation of MAPK1/ERK2, MAPK3/ERK1 and the MAP kinase signaling cascade. Promotes localized and transient activation of guanine nucleotide exchange factors (GEFs) and GTPase-activating proteins (GAPs), and thereby modulates the activity of Rho family GTPases. Signaling via CAS family members mediates activation of RAC1. Recruits the ubiquitin ligase MDM2 to P53/TP53 in the nucleus, and thereby regulates P53/TP53 activity, P53/TP53 ubiquitination and proteasomal degradation. Phosphorylates SRC; this increases SRC kinase activity. Phosphorylates ACTN1, ARHGEF7, GRB7, RET and WASL. Promotes phosphorylation of PXN and STAT1; most likely PXN and STAT1 are phosphorylated by a SRC family kinase that is recruited to autophosphorylated PTK2/FAK1, rather than by PTK2/FAK1 itself. Promotes phosphorylation of BCAR1; GIT2 and SHC1; this requires both SRC and PTK2/FAK1. Promotes phosphorylation of BMX and PIK3R1. Isoform 6 (FRNK) does not contain a kinase domain and inhibits PTK2/FAK1 phosphorylation and signaling. Its enhanced expression can attenuate the nuclear accumulation of LPXN and limit its ability to enhance serum response factor (SRF)-dependent gene transcription. Belongs to the protein kinase superfamily. Tyr protein kinase family. FAK subfamily. Detected in B and T-lymphocytes. Isoform 1 and isoform 6 are detected in lung fibroblasts (at protein level). Ubiquitous. 7 human isoforms generated by alternative promoter usage or alternative splicing have been reported. Note: This description may include information from UniProtKB.
Protein type: EC; Fak family; Kinase, protein; Protein kinase, TK; Protein kinase, tyrosine (non-receptor); TK group
Chromosomal Location of Human Ortholog: 8q24.3
Cellular Component:  adherens junction; apical plasma membrane; cell cortex; cytoplasm; cytoskeleton; cytosol; focal adhesion; lamellipodium; microtubule organizing center; nucleus; plasma membrane; stress fiber
Molecular Function:  actin binding; ATP binding; JUN kinase binding; non-membrane spanning protein tyrosine kinase activity; protein binding; protein kinase activity; protein kinase binding; protein phosphatase binding; protein tyrosine kinase activity; SH2 domain binding
Biological Process:  angiogenesis; axon guidance; cell motility; central nervous system neuron axonogenesis; endothelial cell migration; ephrin receptor signaling pathway; establishment of cell polarity; extracellular matrix organization; Fc-gamma receptor signaling pathway involved in phagocytosis; growth hormone receptor signaling pathway; heart morphogenesis; integrin-mediated signaling pathway; MAPK cascade; microtubule cytoskeleton organization; negative regulation of anoikis; negative regulation of apoptotic process; negative regulation of autophagy; negative regulation of axonogenesis; negative regulation of cell-cell adhesion; negative regulation of organ growth; negative regulation of synapse assembly; netrin-activated signaling pathway; neuron migration; nuclear migration; peptidyl-tyrosine phosphorylation; placenta development; positive regulation of cardiac muscle hypertrophy; positive regulation of cell migration; positive regulation of cell proliferation; positive regulation of phosphatidylinositol 3-kinase activity; positive regulation of phosphatidylinositol 3-kinase signaling; positive regulation of protein kinase activity; positive regulation of protein kinase B signaling; positive regulation of protein phosphorylation; positive regulation of ubiquitin-dependent protein catabolic process; protein autophosphorylation; regulation of cell adhesion mediated by integrin; regulation of cell proliferation; regulation of cell shape; regulation of cytoskeleton organization; regulation of endothelial cell migration; regulation of epithelial cell migration; regulation of focal adhesion assembly; regulation of GTPase activity; regulation of osteoblast differentiation; regulation of protein phosphorylation; regulation of substrate adhesion-dependent cell spreading; signal complex assembly; transforming growth factor beta receptor signaling pathway; vascular endothelial growth factor receptor signaling pathway; vasculogenesis
Reference #:  Q05397 (UniProtKB)
Alt. Names/Synonyms: FADK; FADK 1; FAK; FAK-related non-kinase polypeptide; FAK1; Focal adhesion kinase 1; FRNK; pp125FAK; Protein-tyrosine kinase 2; PTK2; PTK2 protein tyrosine kinase 2
Gene Symbols: PTK2
Molecular weight: 119,233 Da
Basal Isoelectric point: 6.19  Predict pI for various phosphorylation states
CST Pathways:  Actin Dynamics  |  Angiogenesis  |  ErbB/HER Signaling  |  GPCR Signaling to MAPKs  |  Growth And Differentiation Control by MAPKs  |  PI3K/Akt Signaling  |  Tyrosine Kinases & Substrates
Protein-Specific Antibodies or siRNAs from Cell Signaling Technology® Total Proteins
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Cross-references to other databases:  STRING  |  cBioPortal  |  Wikipedia  |  Reactome  |  neXtProt  |  Protein Atlas  |  BioGPS  |  KinBase  |  Pfam  |  RCSB PDB  |  ENZYME  |  Phospho3D  |  Phospho.ELM  |  NetworKIN  |  GeneCards  |  UniProtKB  |  Entrez-Gene  |  GenPept  |  Ensembl Gene