UniProtKB - Q61006 (MUSK_MOUSE)
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Protein
Muscle, skeletal receptor tyrosine-protein kinase
Gene
Musk
Organism
Mus musculus (Mouse)
Status
Functioni
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. 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.5 Publications
Catalytic activityi
ATP + a [protein]-L-tyrosine = ADP + a [protein]-L-tyrosine phosphate.PROSITE-ProRule annotation
Cofactori
Mg2+By similarity
Enzyme regulationi
Positively regulated by CK2.1 Publication
Sites
| Feature key | Position(s) | DescriptionActions | Graphical view | Length |
|---|---|---|---|---|
| Binding sitei | 608 | ATPPROSITE-ProRule annotation | 1 | |
| Active sitei | 724 | Proton acceptorPROSITE-ProRule annotation | 1 |
Regions
| Feature key | Position(s) | DescriptionActions | Graphical view | Length |
|---|---|---|---|---|
| Nucleotide bindingi | 580 – 588 | ATPPROSITE-ProRule annotation | 9 |
GO - Molecular functioni
- ATP binding Source: UniProtKB-KW
- metal ion binding Source: UniProtKB-KW
- PDZ domain binding Source: UniProtKB
- protein tyrosine kinase activity Source: UniProtKB
- transmembrane receptor protein tyrosine kinase activity Source: MGI
GO - Biological processi
- cell differentiation Source: UniProtKB-KW
- multicellular organism development Source: UniProtKB-KW
- neuromuscular junction development Source: MGI
- positive regulation of neuron apoptotic process Source: MGI
- positive regulation of protein geranylgeranylation Source: UniProtKB
- positive regulation of protein phosphorylation Source: UniProtKB
- positive regulation of skeletal muscle acetylcholine-gated channel clustering Source: UniProtKB
- receptor clustering Source: MGI
- regulation of synaptic growth at neuromuscular junction Source: MGI
- regulation of transcription, DNA-templated Source: MGI
- skeletal muscle acetylcholine-gated channel clustering Source: UniProtKB
Keywordsi
| Molecular function | Developmental protein, Kinase, Muscle protein, Receptor, Transferase, Tyrosine-protein kinase |
| Biological process | Differentiation |
| Ligand | ATP-binding, Magnesium, Metal-binding, Nucleotide-binding |
Enzyme and pathway databases
| BRENDAi | 2.7.10.1. 3474. |
Names & Taxonomyi
| Protein namesi | Recommended name: Muscle, skeletal receptor tyrosine-protein kinase (EC:2.7.10.1)Alternative name(s): Muscle-specific tyrosine-protein kinase receptor Short name: MuSK Short name: Muscle-specific kinase receptor |
| Gene namesi | Name:Musk Synonyms:Nsk2 |
| Organismi | Mus musculus (Mouse) |
| Taxonomic identifieri | 10090 [NCBI] |
| Taxonomic lineagei | Eukaryota › Metazoa › Chordata › Craniata › Vertebrata › Euteleostomi › Mammalia › Eutheria › Euarchontoglires › Glires › Rodentia › Myomorpha › Muroidea › Muridae › Murinae › Mus › Mus |
| Proteomesi |
|
Organism-specific databases
| MGIi | MGI:103581. Musk. |
Subcellular locationi
- Cell junction › synapse › postsynaptic cell membrane 1 Publication; Single-pass type I membrane protein 1 Publication
Note: Localizes to the postsynaptic cell membrane of the neuromuscular junction.
Topology
| Feature key | Position(s) | DescriptionActions | Graphical view | Length |
|---|---|---|---|---|
| Topological domaini | 22 – 494 | ExtracellularSequence analysisAdd BLAST | 473 | |
| Transmembranei | 495 – 515 | HelicalSequence analysisAdd BLAST | 21 | |
| Topological domaini | 516 – 868 | CytoplasmicSequence analysisAdd BLAST | 353 |
GO - Cellular componenti
- cell junction Source: UniProtKB-KW
- integral component of plasma membrane Source: UniProtKB
- membrane Source: MGI
- neuromuscular junction Source: UniProtKB
- plasma membrane Source: MGI
- postsynaptic membrane Source: UniProtKB
- receptor complex Source: MGI
- synapse Source: MGI
Keywords - Cellular componenti
Cell junction, Cell membrane, Membrane, Postsynaptic cell membrane, SynapsePathology & Biotechi
Disruption phenotypei
Mice die perinatally being unable to take a breath and to respond to tail or leg pinch. Despite the presence of apparently normal skeletal muscle, the absence of differentiated nerve terminals is sufficient to account for this phenotype. Every aspect of NMJ formation examined is absent in these mice. Branches of the main intramuscular nerve do not establish normal contacts with the muscle, do not form correctly positioned or specialized nerve terminals, and are apparently not given appropriate signals to stop their wandering aimlessly across the muscle. Furthermore, postsynaptic differentiation is absent, muscle-derived proteins normally localized to the synaptic basal lamina or the postsynaptic membrane being uniformly distributed in myofibers.1 Publication
Mutagenesis
| Feature key | Position(s) | DescriptionActions | Graphical view | Length |
|---|---|---|---|---|
| Mutagenesisi | 553 | Y → F: Loss of interaction with DOK7. 1 Publication | 1 |
PTM / Processingi
Molecule processing
| Feature key | Position(s) | DescriptionActions | Graphical view | Length |
|---|---|---|---|---|
| Signal peptidei | 1 – 21 | Sequence analysisAdd BLAST | 21 | |
| ChainiPRO_0000024447 | 22 – 868 | Muscle, skeletal receptor tyrosine-protein kinaseAdd BLAST | 847 |
Amino acid modifications
| Feature key | Position(s) | DescriptionActions | Graphical view | Length |
|---|---|---|---|---|
| Disulfide bondi | 49 ↔ 99 | By similarity | ||
| Disulfide bondi | 98 ↔ 112 | By similarity | ||
| Disulfide bondi | 142 ↔ 190 | By similarity | ||
| Glycosylationi | 222 | N-linked (GlcNAc...) asparagineSequence analysis | 1 | |
| Disulfide bondi | 233 ↔ 282 | By similarity | ||
| Disulfide bondi | 317 ↔ 382 | By similarity | ||
| Disulfide bondi | 325 ↔ 375 | By similarity | ||
| Glycosylationi | 338 | N-linked (GlcNAc...) asparagineBy similarity | 1 | |
| Disulfide bondi | 366 ↔ 406 | By similarity | ||
| Disulfide bondi | 394 ↔ 447 | By similarity | ||
| Disulfide bondi | 398 ↔ 434 | By similarity | ||
| Glycosylationi | 459 | N-linked (GlcNAc...) asparagineSequence analysis | 1 | |
| Modified residuei | 553 | Phosphotyrosine; by autocatalysis2 Publications | 1 | |
| Modified residuei | 680 | Phosphoserine; by CK21 Publication | 1 | |
| Modified residuei | 697 | Phosphoserine; by CK21 Publication | 1 | |
| Modified residuei | 754 | Phosphotyrosine; by autocatalysisBy similarity | 1 |
Post-translational modificationi
Ubiquitinated by PDZRN3. Ubiquitination promotes endocytosis and lysosomal degradation.1 Publication
Phosphorylated (PubMed:16818610). Phosphorylation is induced by AGRIN (PubMed:8653787, PubMed:18848351). Autophosphorylated. Autophosphorylation at Tyr-553 is required for interaction with DOK7 which in turn stimulates the phosphorylation and the activation of MUSK (PubMed:16794080, PubMed:20603078).5 Publications
Neddylated.By similarity
Keywords - PTMi
Disulfide bond, Glycoprotein, Phosphoprotein, Ubl conjugationProteomic databases
| PaxDbi | Q61006. |
| PRIDEi | Q61006. |
PTM databases
| iPTMneti | Q61006. |
| PhosphoSitePlusi | Q61006. |
Expressioni
Tissue specificityi
Expressed preferentially in skeletal muscle.1 Publication
Developmental stagei
Skeletal myogenesis is a major site of expression during normal embryogenesis. In addition, the ganglia of the developing peripheral nervous system and various embryonic epithelia, including those of kidney, lung and gut are also sites of expression.1 Publication
Gene expression databases
| Bgeei | ENSMUSG00000057280. |
| CleanExi | MM_MUSK. |
| ExpressionAtlasi | Q61006. baseline and differential. |
| Genevisiblei | Q61006. MM. |
Interactioni
Subunit structurei
Monomer. Homodimer (Probable). Interacts with LRP4; the heterodimer forms an AGRIN receptor complex that binds AGRIN resulting in activation of MUSK. Forms a heterotetramer composed of 2 DOK7 and 2 MUSK molecules which facilitates MUSK trans-autophosphorylation on tyrosine residue and activation. Interacts (via cytoplasmic part) with DOK7 (via IRS-type PTB domain); requires MUSK phosphorylation. Interacts with DVL1 (via DEP domain); the interaction is direct and mediates the formation of a DVL1, MUSK and PAK1 ternary complex involved in AChR clustering. Interacts with PDZRN3; this interaction is enhanced by agrin. Interacts with FNTA; the interaction is direct and mediates AGRIN-induced phosphorylation and activation of FNTA. Interacts with CSNK2B; mediates regulation by CK2. Interacts (via the cytoplasmic domain) with DNAJA3. Interacts with NSF; may regulate MUSK endocytosis and activity. Interacts with CAV3; may regulate MUSK signaling. Interacts with RNF31.Curated11 Publications
Binary interactionsi
GO - Molecular functioni
- PDZ domain binding Source: UniProtKB
Protein-protein interaction databases
| BioGridi | 201860. 5 interactors. |
| IntActi | Q61006. 4 interactors. |
| STRINGi | 10090.ENSMUSP00000095665. |
Structurei
Secondary structure
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details| Feature key | Position(s) | DescriptionActions | Graphical view | Length |
|---|---|---|---|---|
| Turni | 551 – 554 | Combined sources | 4 |
3D structure databases
| Select the link destinations: PDBei RCSB PDBi PDBji Links Updated | PDB entry | Method | Resolution (Å) | Chain | Positions | PDBsum |
| 3ML4 | X-ray | 2.60 | E/F/G/H | 544-556 | [»] | |
| ProteinModelPortali | Q61006. | |||||
| SMRi | Q61006. | |||||
| ModBasei | Search... | |||||
| MobiDBi | Search... | |||||
Miscellaneous databases
| EvolutionaryTracei | Q61006. |
Family & Domainsi
Domains and Repeats
| Feature key | Position(s) | DescriptionActions | Graphical view | Length |
|---|---|---|---|---|
| Domaini | 28 – 116 | Ig-like 1Add BLAST | 89 | |
| Domaini | 121 – 205 | Ig-like 2Add BLAST | 85 | |
| Domaini | 212 – 302 | Ig-like 3Add BLAST | 91 | |
| Domaini | 312 – 450 | FZPROSITE-ProRule annotationAdd BLAST | 139 | |
| Domaini | 574 – 855 | Protein kinasePROSITE-ProRule annotationAdd BLAST | 282 |
Sequence similaritiesi
Keywords - Domaini
Immunoglobulin domain, Repeat, Signal, Transmembrane, Transmembrane helixPhylogenomic databases
| eggNOGi | ENOG410IMMJ. Eukaryota. COG0515. LUCA. |
| GeneTreei | ENSGT00760000118818. |
| HOGENOMi | HOG000044461. |
| HOVERGENi | HBG052539. |
| InParanoidi | Q61006. |
| KOi | K05129. |
| TreeFami | TF106465. |
Family and domain databases
| Gene3Di | 1.10.2000.10. 1 hit. 2.60.40.10. 3 hits. |
| InterProi | View protein in InterPro IPR020067. Frizzled_dom. IPR007110. Ig-like_dom. IPR013783. Ig-like_fold. IPR013098. Ig_I-set. IPR003599. Ig_sub. IPR003598. Ig_sub2. IPR011009. Kinase-like_dom. IPR000719. Prot_kinase_dom. IPR017441. Protein_kinase_ATP_BS. IPR001245. Ser-Thr/Tyr_kinase_cat_dom. IPR008266. Tyr_kinase_AS. IPR020635. Tyr_kinase_cat_dom. |
| Pfami | View protein in Pfam PF01392. Fz. 1 hit. PF07679. I-set. 2 hits. PF07714. Pkinase_Tyr. 1 hit. |
| PRINTSi | PR00109. TYRKINASE. |
| SMARTi | View protein in SMART SM00409. IG. 3 hits. SM00408. IGc2. 3 hits. SM00219. TyrKc. 1 hit. |
| SUPFAMi | SSF48726. SSF48726. 3 hits. SSF56112. SSF56112. 1 hit. |
| PROSITEi | View protein in PROSITE PS50038. FZ. 1 hit. PS50835. IG_LIKE. 3 hits. PS00107. PROTEIN_KINASE_ATP. 1 hit. PS50011. PROTEIN_KINASE_DOM. 1 hit. PS00109. PROTEIN_KINASE_TYR. 1 hit. |
Sequences (4)i
Sequence statusi: Complete.
Sequence processingi: The displayed sequence is further processed into a mature form.
This entry describes 4 isoformsi produced by alternative splicing. AlignAdd to basket
Isoform 1 (identifier: Q61006-1) [UniParc]FASTAAdd to basket
Also known as: MLK2
This isoform has been chosen as the 'canonical' sequence. All positional information in this entry refers to it. This is also the sequence that appears in the downloadable versions of the entry.
10 20 30 40 50
MRELVNIPLL QMLTLVAFSG TEKLPKAPVI TTPLETVDAL VEEVATFMCA
60 70 80 90 100
VESYPQPEIS WTRNKILIKL FDTRYSIREN GQLLTILSVE DSDDGIYCCI
110 120 130 140 150
ANNGVGGAVE SCGALQVKMK PKITRPPINV KIIEGLKAVL PCTTMGNPKP
160 170 180 190 200
SVSWIKGDNA LRENSRIAVL ESGSLRIHNV QKEDAGQYRC VAKNSLGTAY
210 220 230 240 250
SKLVKLEVEV FARILRAPES HNVTFGSFVT LRCTAIGIPV PTISWIENGN
260 270 280 290 300
AVSSGSIQES VKDRVIDSRL QLFITKPGLY TCIATNKHGE KFSTAKAAAT
310 320 330 340 350
VSIAEWSKSQ KDSQGYCAQY RGEVCDAVLA KDALVFFNTS YRDPEDAQEL
360 370 380 390 400
LIHTAWNELK AVSPLCRPAA EALLCNHLFQ ECSPGVVPTP MPICREYCLA
410 420 430 440 450
VKELFCAKEW QAMEGKAHRG LYRSGMHLLP VPECSKLPSM HRDPTACTRL
460 470 480 490 500
PYLDYKKENI TTFPSITSSR PSADIPNLPA STSSFAVSPA YSMTVIISIV
510 520 530 540 550
SSFALFALLT IATLYCCRRR KEWKNKKRES TAVTLTTLPS ELLLDRLHPN
560 570 580 590 600
PMYQRMPLLL NPKLLSLEYP RNNIEYVRDI GEGAFGRVFQ ARAPGLLPYE
610 620 630 640 650
PFTMVAVKML KEEASADMQA DFQREAALMA EFDNPNIVKL LGVCAVGKPM
660 670 680 690 700
CLLFEYMAYG DLNEFLRSMS PHTVCSLSHS DLSTRARVSS PGPPPLSCAE
710 720 730 740 750
QLCIARQVAA GMAYLSERKF VHRDLATRNC LVGETMVVKI ADFGLSRNIY
760 770 780 790 800
SADYYKADGN DAIPIRWMPP ESIFYNRYTT ESDVWAYGVV LWEIFSYGLQ
810 820 830 840 850
PYYGMAHEEV IYYVRDGNIL ACPENCPLEL YNLMRLCWSK LPADRPSFCS
860
IHRILQRMCE RAEGTVGV
Experimental Info
| Feature key | Position(s) | DescriptionActions | Graphical view | Length |
|---|---|---|---|---|
| Sequence conflicti | 31 | T → A in CAA60165 (PubMed:7624144).Curated | 1 | |
| Sequence conflicti | 31 | T → A in CAA60166 (PubMed:7624144).Curated | 1 | |
| Sequence conflicti | 169 | V → A in CAA60165 (PubMed:7624144).Curated | 1 | |
| Sequence conflicti | 169 | V → A in CAA60166 (PubMed:7624144).Curated | 1 | |
| Sequence conflicti | 211 – 212 | FA → LG in CAA60165 (PubMed:7624144).Curated | 2 | |
| Sequence conflicti | 211 – 212 | FA → LG in CAA60166 (PubMed:7624144).Curated | 2 | |
| Sequence conflicti | 235 | A → E in CAA60165 (PubMed:7624144).Curated | 1 | |
| Sequence conflicti | 235 | A → E in CAA60166 (PubMed:7624144).Curated | 1 | |
| Sequence conflicti | 341 | Y → H in CAA60165 (PubMed:7624144).Curated | 1 | |
| Sequence conflicti | 341 | Y → H in CAA60166 (PubMed:7624144).Curated | 1 | |
| Sequence conflicti | 376 | N → Y in CAA60165 (PubMed:7624144).Curated | 1 | |
| Sequence conflicti | 376 | N → Y in CAA60166 (PubMed:7624144).Curated | 1 | |
| Sequence conflicti | 380 | Q → L in CAA60165 (PubMed:7624144).Curated | 1 | |
| Sequence conflicti | 380 | Q → L in CAA60166 (PubMed:7624144).Curated | 1 | |
| Sequence conflicti | 435 | S → R in CAA60165 (PubMed:7624144).Curated | 1 | |
| Sequence conflicti | 435 | S → R in CAA60166 (PubMed:7624144).Curated | 1 | |
| Sequence conflicti | 503 | F → L in CAA60165 (PubMed:7624144).Curated | 1 | |
| Sequence conflicti | 503 | F → L in CAA60166 (PubMed:7624144).Curated | 1 | |
| Sequence conflicti | 512 | A → V in CAA60165 (PubMed:7624144).Curated | 1 | |
| Sequence conflicti | 512 | A → V in CAA60166 (PubMed:7624144).Curated | 1 |
Alternative sequence
| Feature key | Position(s) | DescriptionActions | Graphical view | Length |
|---|---|---|---|---|
| Alternative sequenceiVSP_010785 | 324 – 338 | VCDAV…LVFFN → GVLMQGPGEKMLLVFLPT in isoform 3. 1 PublicationAdd BLAST | 15 | |
| Alternative sequenceiVSP_010784 | 454 – 462 | DYKKENITT → A in isoform 2. 1 Publication | 9 | |
| Alternative sequenceiVSP_010786 | 866 – 868 | VGV → TDGRAHFFWPHQY in isoform 4. 1 Publication | 3 |
Sequence databases
| Select the link destinations: EMBLi GenBanki DDBJi Links Updated | U37708 mRNA. Translation: AAA79203.1. U37709 mRNA. Translation: AAA79204.1. X86444 mRNA. Translation: CAA60165.1. X86445 Genomic DNA. Translation: CAA60166.1. |
| CCDSi | CCDS18210.1. [Q61006-2] CCDS18211.1. [Q61006-1] |
| PIRi | I48696. I48697. |
| RefSeqi | NP_001032205.1. NM_001037128.1. NP_001032206.1. NM_001037129.1. NP_001032207.1. NM_001037130.1. [Q61006-2] NP_035074.2. NM_010944.2. [Q61006-1] |
| UniGenei | Mm.16148. |
Genome annotation databases
| Ensembli | ENSMUST00000084578; ENSMUSP00000081625; ENSMUSG00000057280. [Q61006-1] ENSMUST00000102893; ENSMUSP00000099957; ENSMUSG00000057280. [Q61006-2] |
| GeneIDi | 18198. |
| KEGGi | mmu:18198. |
| UCSCi | uc033icg.1. mouse. [Q61006-1] |
Keywords - Coding sequence diversityi
Alternative splicingSimilar proteinsi
Links to similar proteins from the UniProt Reference Clusters (UniRef) at 100%, 90% and 50% sequence identity:| 100% | UniRef100 combines identical sequences and sub-fragments with 11 or more residues from any organism into one UniRef entry. |
| 90% | UniRef90 is built by clustering UniRef100 sequences that have at least 90% sequence identity to, and 80% overlap with, the longest sequence (a.k.a seed sequence). |
| 50% | UniRef50 is built by clustering UniRef90 seed sequences that have at least 50% sequence identity to, and 80% overlap with, the longest sequence in the cluster. |
Entry informationi
| Entry namei | MUSK_MOUSE | |
| Accessioni | Q61006Primary (citable) accession number: Q61006 Secondary accession number(s): Q61005, Q61987, Q61988 | |
| Entry historyi | Integrated into UniProtKB/Swiss-Prot: | July 19, 2004 |
| Last sequence update: | November 1, 1996 | |
| Last modified: | May 10, 2017 | |
| This is version 154 of the entry and version 1 of the sequence. See complete history. | ||
| Entry statusi | Reviewed (UniProtKB/Swiss-Prot) | |
| Annotation program | Chordata Protein Annotation Program | |
Miscellaneousi
Keywords - Technical termi
3D-structure, Complete proteome, Reference proteomeDocuments
- MGD cross-references
Mouse Genome Database (MGD) cross-references in UniProtKB/Swiss-Prot - PDB cross-references
Index of Protein Data Bank (PDB) cross-references - Human and mouse protein kinases
Human and mouse protein kinases: classification and index - SIMILARITY comments
Index of protein domains and families
