Summary

Name ACVR2B
Full Name Activin receptor type-2B
Synonyms Activin receptor type IIB, ACTR-IIB
Primary ID Q13705
Links - -
Type protein
Relations 8
Pathways Multiple sclerosis, Myostatin, Satellite: FST transcriptional regulation, Satellite: Myostatin
Function Transmembrane serine/threonine kinase activin type-2 receptor forming an activin receptor complex with activin type-1 serine/threonine kinase receptors (ACVR1, ACVR1B or ACVR1c). Transduces the activin signal from the cell surface to the cytoplasm and is thus regulating many physiological and pathological processes including neuronal differentiation and neuronal survival, hair follicle development and cycling, FSH production by the pituitary gland, wound healing, extracellular matrix production, immunosuppression and carcinogenesis. Activin is also thought to have a paracrine or autocrine role in follicular development in the ovary. Within the receptor complex, the type-2 receptors act as a primary activin receptors (binds activin-A/INHBA, activin-B/INHBB as well as inhibin-A/INHA-INHBA). The type-1 receptors like ACVR1B act as downstream transducers of activin signals. Activin binds to type-2 receptor at the plasma membrane and activates its serine-threonine kinase. The activated receptor type-2 then phosphorylates and activates the type-1 receptor. Once activated, the type-1 receptor binds and phosphorylates the SMAD proteins SMAD2 and SMAD3, on serine residues of the C-terminal tail. Soon after their association with the activin receptor and subsequent phosphorylation, SMAD2 and SMAD3 are released into the cytoplasm where they interact with the common partner SMAD4. This SMAD complex translocates into the nucleus where it mediates activin-induced transcription. Inhibitory SMAD7, which is recruited to ACVR1B through FKBP1A, can prevent the association of SMAD2 and SMAD3 with the activin receptor complex, thereby blocking the activin signal. Activin signal transduction is also antagonized by the binding to the receptor of inhibin-B via the IGSF1 inhibin coreceptor.

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Modifications Tables

Relations

Regulator Mechanism target score
+ up-regulates activity img/direct-activation.png phosphorylation ACVR1B 0.672
Publications: 1 Organism: Homo Sapiens
Pathways:Multiple sclerosis
+ up-regulates activity img/direct-activation.png binding ACVR2B 0.669
Publications: 1 Organism: Mus Musculus
+ up-regulates img/direct-activation.png binding ACVR2B 0.651
Publications: 2 Organism: Homo Sapiens
Tissue: Kidney
+ up-regulates activity img/direct-activation.png phosphorylation SMAD3 0.676
Publications: 1 Organism: Mus Musculus
Pathways:Multiple sclerosis
+ up-regulates activity img/direct-activation.png binding ACVR2B 0.774
Publications: 1 Organism: Homo Sapiens
Pathways:Multiple sclerosis
+ up-regulates activity img/direct-activation.png phosphorylation SMAD2 0.767
Publications: 1 Organism: Mus Musculus
Pathways:Multiple sclerosis
+ up-regulates img/direct-activation.png binding ACVR2B 0.565
Publications: 1 Organism: Homo Sapiens