FGFR1/CD331 (FGFR1) Active Protein

The protein encoded by this gene is a member of the fibroblast growth factor receptor (FGFR) family, where amino acid sequence is highly conserved between members and throughout evolution. FGFR family members differ from one another in their ligand affinities and tissue distribution. A full-length representative protein consists of an extracellular region, composed of three immunoglobulin-like domains, a single hydrophobic membrane-spanning segment and a cytoplasmic tyrosine kinase domain. The extracellular portion of the protein interacts with fibroblast growth factors, setting in motion a cascade of downstream signals, ultimately influencing mitogenesis and differentiation. This particular family member binds both acidic and basic fibroblast growth factors and is involved in limb induction. Mutations in this gene have been associated with Pfeiffer syndrome, Jackson-Weiss syndrome, Antley-Bixler syndrome, osteoglophonic dysplasia, and autosomal dominant Kallmann syndrome 2. Chromosomal aberrations involving this gene are associated with stem cell myeloproliferative disorder and stem cell leukemia lymphoma syndrome. Alternatively spliced variants which encode different protein isoforms have been described; however, not all variants have been fully characterized. [provided by RefSeq, Jul 2008]

FGFR1: a receptor tyrosine kinase of the highly-conserved fibroblast growth factor receptor (FGFR). Binds both acidic and basic fibroblast growth factors and is involved in limb induction. Point mutations cause Pfeffer syndrome (finger and toe malformations and other skeletal errors) and dominant Kallmann syndrome 2. Stem cell leukemia lymphoma syndrome (SCLL) may be caused by a t(8;13)(p12;q12) translocation that fuses a zinc finger gene, ZNF198, to FGFR1. Various myeloproliferative disorders have been linked to translocations that fuse FGFR1 to FOP, FIM, CEP1 or the atypical kinase, Bcr. Inhibitor: SU5402. 20 isoforms of the human protein produced by alternative splicing have been described.

Protein type: Oncoprotein; EC 2.7.10.1; Kinase, protein; Protein kinase, TK; Membrane protein, integral; Protein kinase, tyrosine (receptor); TK group; FGFR family

Chromosomal Location of Human Ortholog: 8p11.23-p11.22

Cellular Component: integral to plasma membrane; cytoplasmic membrane-bound vesicle; plasma membrane; integral to membrane; extracellular region; cytosol; nucleus; receptor complex

Molecular Function: heparin binding; identical protein binding; protein binding; protein homodimerization activity; fibroblast growth factor binding; fibroblast growth factor receptor activity; protein-tyrosine kinase activity; ATP binding

Biological Process: paraxial mesoderm development; axon guidance; peptidyl-tyrosine phosphorylation; nerve growth factor receptor signaling pathway; protein amino acid autophosphorylation; cell maturation; neuron migration; negative regulation of transcription from RNA polymerase II promoter; middle ear morphogenesis; protein amino acid phosphorylation; positive regulation of MAP kinase activity; sensory perception of sound; positive regulation of MAPKKK cascade; ureteric bud development; regulation of cell differentiation; induction of an organ; positive regulation of mesenchymal cell proliferation; positive regulation of cell proliferation; midbrain development; chondrocyte differentiation; angiogenesis; skeletal development; positive regulation of cardiac muscle cell proliferation; embryonic limb morphogenesis; epidermal growth factor receptor signaling pathway; inner ear morphogenesis; cell migration; phosphoinositide-mediated signaling; chordate embryonic development; fibroblast growth factor receptor signaling pathway; transcription, DNA-dependent; in utero embryonic development; outer ear morphogenesis; MAPKKK cascade; positive regulation of cell cycle; neuroblast division in the ventricular zone; positive regulation of phosphoinositide 3-kinase cascade; mesenchymal cell differentiation; skeletal morphogenesis; insulin receptor signaling pathway; innate immune response; auditory receptor cell development; positive regulation of neuron differentiation; regulation of lateral mesodermal cell fate specification

Disease: Pfeiffer Syndrome; Hypogonadotropic Hypogonadism 2 With Or Without Anosmia; Jackson-weiss Syndrome; Trigonocephaly 1; Osteoglophonic Dysplasia