Tchem MUSK Muscle, skeletal receptor tyrosine-protein kinase

Protein Summary

Description

Receptor tyrosine kinase which plays a central role in the formation and the maintenance of the neuromuscular junction (NMJ), the synapse between the motor neuron and the skeletal muscle (PubMed:25537362). Recruitment of AGRIN by LRP4 to the MUSK signaling complex induces phosphorylation and activation of MUSK, the kinase of the complex. The activation of MUSK in myotubes regulates the formation of NMJs through the regulation of different processes including the specific expression of genes in subsynaptic nuclei, the reorganization of the actin cytoskeleton and the clustering of the acetylcholine receptors (AChR) in the postsynaptic membrane. May regulate AChR phosphorylation and clustering through activation of ABL1 and Src family kinases which in turn regulate MUSK. DVL1 and PAK1 that form a ternary complex with MUSK are also important for MUSK-dependent regulation of AChR clustering. May positively regulate Rho family GTPases through FNTA. Mediates the phosphorylation of FNTA which promotes prenylation, recruitment to membranes and activation of RAC1 a regulator of the actin cytoskeleton and of gene expression. Other effectors of the MUSK signaling include DNAJA3 which functions downstream of MUSK. May also play a role within the central nervous system by mediating cholinergic responses, synaptic plasticity and memory formation (By similarity). This gene encodes a muscle-specific tyrosine kinase receptor. The encoded protein may play a role in clustering of the acetylcholine receptor in the postsynaptic neuromuscular junction. Mutations in this gene have been associated with congenital myasthenic syndrome. Alternatively spliced transcript variants have been described.[provided by RefSeq, Oct 2009]

Uniprot Accession IDs

• O15146
• Q32MJ8
• Q32MJ9
• Q5VZW7
• Q5VZW8

Gene Name

• MUSK

Ensembl ID

• ENST00000189978
• ENSP00000189978
• ENSG00000030304
• ENST00000374448
• ENSP00000363571

Symbol

• CMS9
• FADS

Knowledge Table

Most Knowledge About	Knowledge Value (0 to 1 scale)
protein domain	1
molecular function	0.98
biological process	0.82
trait	0.75
kinase perturbation	0.71

Protein Classes

DTO Classes

Protein / Kinase / Protein Kinase / Tk Group / Musk Family / Muscle, Skeletal Receptor Tyrosine-protein Kinase

IDG Development Level Summary

Tdark

These are targets about which virtually nothing is known. They do not have known drug or small molecule activities
- AND - satisfy two or more of the following criteria:

Pubmed score: 903.47   (req: < 5)

Gene RIFs: 55   (req: <= 3)

Antibodies: 447   (req: <= 50)

Tbio

These targets do not have known drug or small molecule activities
- AND - satisfy two or more of the following criteria:

Pubmed score: 903.47   (req: >= 5)

Gene RIFs: 55   (req: > 3)

Antibodies: 447   (req: > 50)

- OR - satisfy the following criterion:

Gene Ontology Terms: 20

Tchem

Target has at least one ChEMBL compound with an activity cutoff of < 30 nM - AND - satisfies the preceding conditions

Active Ligands: 6

Tclin

Target has at least one approved drug - AND - satisfies the preceding conditions

Active Drug: 0