Recombinant human NRG1 protein

Specifications

Form

Lyophilized

Additional notes

Greater than 98% by HPLC analyses

General info

Function

Direct ligand for ERBB3 and ERBB4 tyrosine kinase receptors. Concomitantly recruits ERBB1 and ERBB2 coreceptors, resulting in ligand-stimulated tyrosine phosphorylation and activation of the ERBB receptors. The multiple isoforms perform diverse functions such as inducing growth and differentiation of epithelial, glial, neuronal, and skeletal muscle cells; inducing expression of acetylcholine receptor in synaptic vesicles during the formation of the neuromuscular junction; stimulating lobuloalveolar budding and milk production in the mammary gland and inducing differentiation of mammary tumor cells; stimulating Schwann cell proliferation; implication in the development of the myocardium such as trabeculation of the developing heart. Isoform 10 may play a role in motor and sensory neuron development. Binds to ERBB4 (PubMed : 10867024, PubMed : 7902537). Binds to ERBB3 (PubMed : 20682778). Acts as a ligand for integrins and binds (via EGF domain) to integrins ITGAV : ITGB3 or ITGA6 : ITGB4. Its binding to integrins and subsequent ternary complex formation with integrins and ERRB3 are essential for NRG1-ERBB signaling. Induces the phosphorylation and activation of MAPK3/ERK1, MAPK1/ERK2 and AKT1 (PubMed : 20682778). Ligand-dependent ERBB4 endocytosis is essential for the NRG1-mediated activation of these kinases in neurons (By similarity).

Sequence similarities

Belongs to the neuregulin family.

Post-translational modifications

Proteolytic cleavage close to the plasma membrane on the external face leads to the release of the soluble growth factor form.. N- and O-glycosylated. Extensive glycosylation precedes the proteolytic cleavage (By similarity).

Subcellular localisation

Nucleus