Protein: Agrin [Cleaved into: Agrin N-terminal 110 kDa subunit; Agrin C-terminal 110 kDa subunit; Agrin C-terminal 90 kDa fragment (C90); Agrin C-terminal 22 kDa fragment (C22)] (P31696)
Organism: Gallus gallus (Chicken)
Function: Heparan sulfate basal lamina glycoprotein that plays a central role in the formation and the maintenance of the neuromuscular junction (NMJ) and directs key events in postsynaptic differentiation. Component of the AGRN-LRP4 receptor complex that induces the phosphorylation and activation of MUSK. The activation of MUSK in myotubes induces the formation of NMJ by regulating different processes including the transcription of specific genes and the clustering of AChR in the postsynaptic membrane. Calcium ions are required for maximal AChR clustering. AGRN function in neurons is highly regulated by alternative splicing, glycan binding and proteolytic processing. Modulates calcium ion homeostasis in neurons, specifically by inducing an increase in cytoplasmic calcium ions. Functions differentially in the central nervous system (CNS) by inhibiting the alpha(3)-subtype of Na+/K+-ATPase and evoking depolarization at CNS synapses.
Subcellular location: [Isoform 1]: Secreted, extracellular space, extracellular matrix {ECO:0000269|PubMed:11161480, ECO:0000269|PubMed:8522611}. Note=Synaptic basal lamina at the neuromuscular junction. {ECO:0000269|PubMed:11161480}.; SUBCELLULAR LOCATION: [Isoform 9]: Synapse {ECO:0000269|PubMed:11161480}. Cell membrane {ECO:0000269|PubMed:11161480}; Single-pass type II membrane protein {ECO:0000269|PubMed:11161480}.
Interaction partners:
- Muscle, skeletal receptor tyrosine protein kinase
- Peptidase S72 domain-containing protein.
- LDL receptor related protein 4.
- Acetylcholine receptor subunit delta
- 43 kDa receptor-associated protein of the synapse
- Docking protein 7.
- Collagen alpha-1
- Nidogen 1.
- Transmembrane serine protease 15
- Low-density lipoprotein receptor-related protein
Sequence:
MGGSGAAATLALGLALGLALGGWANCPERELQRREEEANVVLTGTVEEIMNVDPVHHTYSCKVRVWRYLKGKDIVTHEILLDGGNKVVIGGFGDPLICDNQVSTGDTRIFFVNPAPQYMWPAHRNELMLNSSLMRITLRNLEEVEHCVEEHRKLLADKPNSYFTQTPPTPRDACRGMLCGFGAVCERSPTDPSQASCVCKKTACPVVVAPVCGSDYSTYSNECELEKAQCNQQRRIKVISKGPCGSKDPCAEVTCSFGSTCVRSADGQTAGCVCPASCSGVAESIVCGSDGKDYRSECDLNKHACDKQENVFKKFDGACDPCKGILNDMNRVCRVNPRTRRVELLSRPENCPSKREPVCGDDGVTYASECVMGRTGAIRGLEIQKVRSGQCQHQDKCKDECKFNAVCLKRWHARCSCDRITCDGTYRPVCARDSRTYSNDCERQKAECHQKAAIPVKHSGPCDLGTPSPCLSVECTFGATCVVKNREPVCECQQVCQGRYDPVCGSDNRTYGNPCELNAMACVLKREIRVKHKGPCDRCGKCQFGAICEAETGRCVCPTECVPSSQPVCGTDGNTYGSECELHVRACTQQKNILVAAQGDCKSCGTTVCSFGSTCVGGQCVCPRCEQQPLAQVCGTDGLTYDNRCELRAASCQQQKSIEVAKMGPCEDECGSGGSGSGDGSECEQDRCRHYGGWWDEDAEDDRCVCDFTCLAVPRSPVCGSDDVTYANECELKKTRCEKRQNLYVTSQGACRALTTTPPPLPVVHCSQTIYGCCPDNMTLALGVGAAGCPSTCQCNPYGSYGGTCDPATGQCSCKPGVGGLKCDRCEPGFWNFRGIVTDSKSGCTPCNCDPVGSVRDDCEQMTGLCSCKTGITGMKCNQCPNGSKMGMAGCEKDPSAPKSCEEMSCEFGATCVEVNGFAHCECPSPLCSEANMTKVCGSDGVTYGDQCQLKTIACRQGQLITVKHVGQCHESITHTSHTMPPTPLPTLPLDKLIVPPPLQLTTQAPEPTELATTSLLMEASPTTRSHPTTRRVTTTRPVTTPWMTHGVLKTTVRPLSTSPVVLATTQPPYAESGSAEGSGDQEMSISGDQESSGAGSAGEEEVEESQVTPTPAIERATCYNTPLGCCSDGKTAAADAEGSNCPATKVFQGVLILEEVEGQELFYTPEMADPKSELFGETARSIESALDELFRNSDVKNDFKSIRVRDLGQSSAVRVIVESHFDPATSYTAADVQAASLKQIRASKKRTILVKKPQQEHVKFMDFDWIPRIFTTTITTTTATTMAPATTRRHTTASAATTAHILRQDTVGHPSAKLAAPASTRRPTSTLPTTARRKPTRQPPSTTKKPSRPCDSHPCLHGGTCEDDGREFTCRCPAGKGGAVCEKPIRYFIPSFGGKSYLAFKMMKAYHTVRIAMEFRATELSGLLLYNGQNRGKDFISLALVGGFVELRFNTGSGTGVITSKVRVEPGKWHQLVVNRNRRSGMLAVDGEHVSGESPTGTDGLNLDTDLFVGGAPEDQMAVVAERTAATVGLKGSIRLLDVNNQMYDLREKGSDVLYGSGVGECGNDPCHPNPCHHGASCHVKEAEMFHCECLHSYTGPTCADERNPCDPTPCHISATCLVLPEGGAMCACPMGREGEFCERVTEQDHTMPFLPEFNGFSYLELNGLQTLFLTCRQMSMEVVFLAKSPSGMIFYNGQKTDGKGDFVSLALHDGYLEYRYDLGKGAAVLRSKEPVPLNTWISVLLERSGRKGVMRINNGERVMGESPKSRKVPHAFLNLKEPFYVGGAPDFSKLARAAAISTSFYGAVQRISIKGVPLLKEQHIRSAVEISTFRAHPCTQKPNPCQNGGTCSPRLESYECACQRGFSGAHCEKVIIEKAAGDAEAIAFDGRTYMEYHNAVTKSHLSNEIPAPDALDYPAEPSEKALQSNHFELSIKTEATQGLILWSGKGLERSDYIALAIVDGFVQMMYDLGSKPVVLRSTVPINTNHWTHIKAYRVQREGSLQVGNEAPITGSSPLGATQLDTDGALWLGGMERLSVAHKLPKAYSTGFIGCIRDVIVDRQELHLVEDALNNPTILHCSAK