FGFR3_HUMAN » Fibroblast growth factor receptor 3

FGFR3_HUMAN » Fibroblast growth factor receptor 3
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Topology in Plasma membrane
Topologyextracellular side
cytoplasmic side
FGFR3_HUMAN » Fibroblast growth factor receptor 3 » FGFR-3;
Hydrophobic Thickness 39.6 ± 1.6 Å
Tilt Angle 0 ± 0°
ΔGtransfer -52.8 kcal/mol
ΔGfold -19.8 kcal/mol
Links UniProtKB, Pfam, Interpro, iHOP, STRING, HGNC, HMDB
Topology Out
TM Segments 376-398 (366-400)

Bladder cancer (KEGG)

Endocytosis (KEGG)

Immune System (Reactome)

MAPK signaling pathway (KEGG)

Pathways in cancer (KEGG)

PI3K-Akt signaling pathway (KEGG)

Regulation of actin cytoskeleton (KEGG)

Signal Transduction (Reactome)

PDB 4k33 (449-759), 2lzl (A/B=357-399), 1ry7 (B=33-365)
OPM 2lzl



EPHA4, Complex: EPHA4:FGFR3, PubMed

FGFR3, Complex: Transmembrane homodimer of fibroblast growth factor receptor 3, PDBID: 2LZL

GOLI, Complex: GOLI:FGFR3, PubMed

MUC1, Complex: MUC1:FGFR3, PubMed


AA: 160-245, PDBID: 1RY7, Subunit B, Seq Identity:100%, Immunoglobulin I-set domain

AA: 252-343, PDBID: 1RY7, Subunit B, Seq Identity:100%, Immunoglobulin domain

AA: 472-748, PDBID: 4K33, Subunit A, Seq Identity:100%, Protein tyrosine kinase

UniProt annotation for FGFR3_HUMAN » Fibroblast growth factor receptor 3
FUNCTION: Tyrosine-protein kinase that acts as cell-surface receptor for fibroblast growth factors and plays an essential role in the regulation of cell proliferation, differentiation and apoptosis. Plays an essential role in the regulation of chondrocyte differentiation, proliferation and apoptosis, and is required for normal skeleton development. Regulates both osteogenesis and postnatal bone mineralization by osteoblasts. Promotes apoptosis in chondrocytes, but can also promote cancer cell proliferation. Required for normal development of the inner ear. Phosphorylates PLCG1, CBL and FRS2. Ligand binding leads to the activation of several signaling cascades. Activation of PLCG1 leads to the production of the cellular signaling molecules diacylglycerol and inositol 1,4,5-trisphosphate. Phosphorylation of FRS2 triggers recruitment of GRB2, GAB1, PIK3R1 and SOS1, and mediates activation of RAS, MAPK1/ERK2, MAPK3/ERK1 and the MAP kinase signaling pathway, as well as of the AKT1 signaling pathway. Plays a role in the regulation of vitamin D metabolism. Mutations that lead to constitutive kinase activation or impair normal FGFR3 maturation, internalization and degradation lead to aberrant signaling. Over-expressed or constitutively activated FGFR3 promotes activation of PTPN11/SHP2, STAT1, STAT5A and STAT5B. Secreted isoform 3 retains its capacity to bind FGF1 and FGF2 and hence may interfere with FGF signaling.

CATALYTIC ACTIVITY: ATP + a [protein]-L-tyrosine = ADP + a [protein]-L-tyrosine phosphate.

ENZYME REGULATION: Present in an inactive conformation in the absence of bound ligand. Ligand binding leads to dimerization and activation by autophosphorylation on tyrosine residues. Inhibited by SU5402.

SUBUNIT: Monomer. Homodimer after ligand binding. Interacts with FGF1, FGF2, FGF4, FGF6; FGF8, FGF9, FGF10, FGF17, FGF18, FGF19, FGF20 and FGF23 (in vitro). Interacts with KLB. Affinity for fibroblast growth factors (FGFs) is increased by heparan sulfate glycosaminoglycans that function as coreceptors. Likewise, KLB increases the affinity for FGF19 and FGF21. Interacts with PIK3R1, PLCG1, SOCS1 and SOCS3. Isoform 3 forms disulfide-linked dimers.

TISSUE SPECIFICITY: Expressed in brain, kidney and testis. Very low or no expression in spleen, heart, and muscle. In 20- to 22- week old fetuses it is expressed at high level in kidney, lung, small intestine and brain, and to a lower degree in spleen, liver, and muscle. Isoform 2 is detected in epithelial cells. Isoform 1 is not detected in epithelial cells. Isoform 1 and isoform 2 are detected in fibroblastic cells.

DOMAIN: The second and third Ig-like domains directly interact with fibroblast growth factors (FGF) and heparan sulfate proteoglycans.

DISEASE: Achondroplasia (ACH) OMIM: A frequent form of short-limb dwarfism. It is characterized by a long, narrow trunk, short extremities, particularly in the proximal (rhizomelic) segments, a large head with frontal bossing, hypoplasia of the midface and a trident configuration of the hands. mutations affecting the gene represented in this entry.

DISEASE: Crouzon syndrome with acanthosis nigricans (CAN) OMIM: Classic Crouzon disease which is caused by mutations in the FGFR2 gene is characterized by craniosynostosis (premature fusion of the skull sutures), and facial hypoplasia. Crouzon syndrome with acanthosis nigricans (a skin disorder characterized by pigmentation anomalies), CAN, is considered to be an independent disorder from classic Crouzon syndrome. CAN is characterized by additional more severe physical manifestation, such as Chiari malformation, hydrocephalus, and atresia or stenosis of the choanas, and is caused by a specific mutation (Ala-391 to Glu) in the transmembrane domain of FGFR3. It is proposed to have an autosomal dominant mode of inheritance. Note=The disease is caused by mutations affecting the gene represented in this entry.

DISEASE: Thanatophoric dysplasia 1 (TD1) OMIM: A neonatal lethal skeletal dysplasia. Affected individuals manifest severe shortening of the limbs with macrocephaly, narrow thorax, short ribs, and curved femurs. mutations affecting the gene represented in this entry.

DISEASE: Thanatophoric dysplasia 2 (TD2) OMIM: A neonatal lethal skeletal dysplasia causing severe shortening of the limbs, narrow thorax and short ribs. Patients with thanatophoric dysplasia type 2 have straight femurs and cloverleaf skull. mutations affecting the gene represented in this entry.

DISEASE: Hypochondroplasia (HCH) OMIM: Autosomal dominant disease and is characterized by disproportionate short stature. It resembles achondroplasia, but with a less severe phenotype. disease is caused by mutations affecting the gene represented in this entry.

DISEASE: Bladder cancer (BLC) OMIM: A malignancy originating in tissues of the urinary bladder. It often presents with multiple tumors appearing at different times and at different sites in the bladder. Most bladder cancers are transitional cell carcinomas that begin in cells that normally make up the inner lining of the bladder. Other types of bladder cancer include squamous cell carcinoma (cancer that begins in thin, flat cells) and adenocarcinoma (cancer that begins in cells that make and release mucus and other fluids). Bladder cancer is a complex disorder with both genetic and environmental influences. associated with variations affecting the gene represented in this entry. Somatic mutations can constitutively activate FGFR3.

DISEASE: Cervical cancer (CERCA) OMIM: A malignant neoplasm of the cervix, typically originating from a dysplastic or premalignant lesion previously present at the active squamocolumnar junction. The transformation from mild dysplastic to invasive carcinoma generally occurs slowly within several years, although the rate of this process varies widely. Carcinoma in situ is particularly known to precede invasive cervical cancer in most cases. Cervical cancer is strongly associated with infection by oncogenic types of human papillomavirus. Note=The gene represented in this entry is involved in disease pathogenesis.

DISEASE: Camptodactyly tall stature and hearing loss syndrome (CATSHL syndrome) OMIM: Autosomal dominant syndrome characterized by permanent and irreducible flexion of one or more fingers of the hand and/or feet, tall stature, scoliosis and/or a pectus excavatum, and hearing loss. Affected individuals have developmental delay and/or mental retardation, and several of these have microcephaly. Radiographic findings included tall vertebral bodies with irregular borders and broad femoral metaphyses with long tubular shafts. On audiological exam, each tested member have bilateral sensorineural hearing loss and absent otoacoustic emissions. The hearing loss was congenital or developed in early infancy, progressed variably in early childhood, and range from mild to severe. Computed tomography and magnetic resonance imaging reveal that the brain, middle ear, and inner ear are structurally normal. Note=The disease is caused by mutations affecting the gene represented in this entry.

DISEASE: Multiple myeloma (MM) OMIM: A malignant tumor of plasma cells usually arising in the bone marrow and characterized by diffuse involvement of the skeletal system, hyperglobulinemia, Bence-Jones proteinuria and anemia. Complications of multiple myeloma are bone pain, hypercalcemia, renal failure and spinal cord compression. The aberrant antibodies that are produced lead to impaired humoral immunity and patients have a high prevalence of infection. Amyloidosis may develop in some patients. Multiple myeloma is part of a spectrum of diseases ranging from monoclonal gammopathy of unknown significance (MGUS) to plasma cell leukemia. Note=The gene represented in this entry may be involved in disease pathogenesis. A chromosomal aberration involving FGFR3 is found in multiple myeloma. Translocation t(4;14)(p16.3;q32.3) with the IgH locus.

DISEASE: Lacrimo-auriculo-dento-digital syndrome (LADDS) OMIM: An autosomal dominant ectodermal dysplasia, a heterogeneous group of disorders due to abnormal development of two or more ectodermal structures. Lacrimo-auriculo-dento-digital syndrome is characterized by aplastic/hypoplastic lacrimal and salivary glands and ducts, cup-shaped ears, hearing loss, hypodontia and enamel hypoplasia, and distal limb segments anomalies. In addition to these cardinal features, facial dysmorphism, malformations of the kidney and respiratory system and abnormal genitalia have been reported. Craniosynostosis and severe syndactyly are not observed. Note=The disease is caused by mutations affecting the gene represented in this entry.

DISEASE: Keratinocytic non-epidermolytic nevus (KNEN) OMIM: Epidermal nevi of the common, non-organoid and non- epidermolytic type are benign skin lesions and may vary in their extent from a single (usually linear) lesion to widespread and systematized involvement. They may be present at birth or develop early during childhood. disease is caused by mutations affecting the gene represented in this entry.

DISEASE: Muenke syndrome (MNKS) OMIM: A condition characterized by premature closure of coronal suture of skull during development (coronal craniosynostosis), which affects the shape of the head and face. It may be uni- or bilateral. When bilateral, it is characterized by a skull with a small antero- posterior diameter (brachycephaly), often with a decrease in the depth of the orbits and hypoplasia of the maxillae. Unilateral closure of the coronal sutures leads to flattening of the orbit on the involved side (plagiocephaly). The intellect is normal. In addition to coronal craniosynostosis some affected individuals show skeletal abnormalities of hands and feet, sensorineural hearing loss, mental retardation and respiratory insufficiency. mutations affecting the gene represented in this entry.

DISEASE: Keratosis, seborrheic (KERSEB) OMIM: A common benign skin tumor. Seborrheic keratoses usually begin with the appearance of one or more sharply defined, light brown, flat macules. The lesions may be sparse or numerous. As they initially grow, they develop a velvety to finely verrucous surface, followed by an uneven warty surface with multiple plugged follicles and a dull or lackluster appearance. Note=The disease is caused by mutations affecting the gene represented in this entry.

DISEASE: Testicular germ cell tumor (TGCT) OMIM: A common malignancy in males representing 95% of all testicular neoplasms. TGCTs have various pathologic subtypes including: unclassified intratubular germ cell neoplasia, seminoma (including cases with syncytiotrophoblastic cells), spermatocytic seminoma, embryonal carcinoma, yolk sac tumor, choriocarcinoma, and teratoma. entry may be involved in disease pathogenesis.

UniProt features for FGFR3_HUMAN » Fibroblast growth factor receptor 3
CHAIN 23 806 Fibroblast growth factor receptor 3.
DOMAIN 24 126 Ig-like C2-type 1.
DOMAIN 151 244 Ig-like C2-type 2.
DOMAIN 253 355 Ig-like C2-type 3.
DOMAIN 472 761 Protein kinase.
ACT_SITE 617 617 Proton acceptor (By similarity).
DISULFID 61 109 By similarity.
DISULFID 176 228 By similarity.
DISULFID 275 339 By similarity.
Amino Acid Sequence for FGFR3_HUMAN » Fibroblast growth factor receptor 3