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Domain

Comprised of a NH2-terminal actin-binding domain, 24 internally homologous repeats and two hinge regions. Repeat 24 and the second hinge domain are important for dimer formation. The first hinge region prevents binding to ITGA and ITGB subunits.

Function

Connects cell membrane constituents to the actin cytoskeleton. May promote orthogonal branching of actin filaments and links actin filaments to membrane glycoproteins. Anchors various transmembrane proteins to the actin cytoskeleton. Interaction with FLNA may allow neuroblast migration from the ventricular zone into the cortical plate. Various interactions and localizations of isoforms affect myotube morphology and myogenesis. Isoform 6 accelerates muscle differentiation in vitro.

Involvement in disease

Interaction with FLNA may compensate for dysfunctional FLNA homodimer in the periventricular nodular heterotopia (PVNH) disorder.

Atelosteogenesis 1

AO1

A lethal chondrodysplasia characterized by distal hypoplasia of the humeri and femurs, hypoplasia of the mid-thoracic spine, occasionally complete lack of ossification of single hand bones, and the finding in cartilage of multiple degenerated chondrocytes which are encapsulated in fibrous tissue.

None

The disease is caused by variants affecting the gene represented in this entry.

Atelosteogenesis 3

AO3

A short-limb lethal skeletal dysplasia with vertebral abnormalities, disharmonious skeletal maturation, poorly modeled long bones and joint dislocations. Recurrent respiratory insufficiency and/or infections usually result in early death.

None

The disease is caused by variants affecting the gene represented in this entry.

Boomerang dysplasia

BOOMD

A perinatal lethal osteochondrodysplasia characterized by absence or underossification of the limb bones and vertebrae. Patients manifest dwarfism with short, bowed, rigid limbs and characteristic facies. Boomerang dysplasia is distinguished from atelosteogenesis on the basis of a more severe defect in mineralization, with complete absence of ossification in some limb elements and vertebral segments.

None

The disease is caused by variants affecting the gene represented in this entry.

Larsen syndrome

LRS

An osteochondrodysplasia characterized by large-joint dislocations and characteristic craniofacial abnormalities. The cardinal features of the condition are dislocations of the hip, knee and elbow joints, with equinovarus or equinovalgus foot deformities. Spatula-shaped fingers, most marked in the thumb, are also present. Craniofacial anomalies include hypertelorism, prominence of the forehead, a depressed nasal bridge, and a flattened midface. Cleft palate and short stature are often associated features. Spinal anomalies include scoliosis and cervical kyphosis. Hearing loss is a well-recognized complication.

None

The disease is caused by variants affecting the gene represented in this entry.

Spondylocarpotarsal synostosis syndrome

SCT

Disorder characterized by short stature and vertebral, carpal and tarsal fusions.

None

The disease is caused by variants affecting the gene represented in this entry.

Post-translational modifications

ISGylation prevents ability to interact with the upstream activators of the JNK cascade and inhibits IFNA-induced JNK signaling.

Ubiquitination by a SCF-like complex containing ASB2 isoform 1 leads to proteasomal degradation which promotes muscle differentiation.

Sequence similarities

Belongs to the filamin family.

Tissue specificity

Ubiquitous. Isoform 1 and isoform 2 are expressed in placenta, bone marrow, brain, umbilical vein endothelial cells (HUVEC), retina and skeletal muscle. Isoform 1 is predominantly expressed in prostate, uterus, liver, thyroid, stomach, lymph node, small intestine, spleen, skeletal muscle, kidney, placenta, pancreas, heart, lung, platelets, endothelial cells, megakaryocytic and erythroleukemic cell lines. Isoform 2 is predominantly expressed in spinal cord, platelet and Daudi cells. Also expressed in thyroid adenoma, neurofibrillary tangles (NFT), senile plaques in the hippocampus and cerebral cortex in Alzheimer disease (AD). Isoform 3 and isoform 6 are expressed predominantly in lung, heart, skeletal muscle, testis, spleen, thymus and leukocytes. Isoform 4 and isoform 5 are expressed in heart.

Cellular localization

  • Isoform 1
  • Cytoplasm
  • Cell cortex
  • Cytoplasm
  • Cytoskeleton
  • Cytoplasm
  • Cytoskeleton
  • Stress fiber
  • Cytoplasm
  • Myofibril
  • Sarcomere
  • Z line
  • In differentiating myotubes, isoform 1, isoform 2 and isoform 3 are localized diffusely throughout the cytoplasm with regions of enrichment at the longitudinal actin stress fiber. In differentiated tubes, isoform 1 is also detected within the Z-lines.
  • Isoform 2
  • Cytoplasm
  • Cytoskeleton
  • Stress fiber
  • Isoform 3
  • Cytoplasm
  • Cytoskeleton
  • Stress fiber
  • Isoform 6
  • Cytoplasm
  • Cytoskeleton
  • Polarized at the periphery of myotubes.

Alternative names

FLN1L, FLN3, TABP, TAP, FLNB, Filamin-B, FLN-B, ABP-278, ABP-280 homolog, Actin-binding-like protein, Beta-filamin, Filamin homolog 1, Filamin-3, Thyroid autoantigen, Truncated actin-binding protein, Fh1, Truncated ABP

Target type

Proteins

Primary research area

Immunology & Infectious Disease

Molecular weight

278164Da

We found 12 products in 3 categories

Primary Antibodies

Assay Kits

Reactive species

Detection method

Proteins & Peptides

Species of origin