Protein: Calsyntenin-3 (Q9BQT9)
Organism: Homo sapiens (Human)
Function: Postsynaptic adhesion molecule that binds to presynaptic neurexins to mediate both excitatory and inhibitory synapse formation. Promotes synapse development by acting as a cell adhesion molecule at the postsynaptic membrane, which associates with both neurexin-alpha and neurexin-beta proteins at the presynaptic membrane. Regulates the balance between excitatory and inhibitory synapses by inhibiting formation of excitatory parallel- fiber synapses and promoting formation of inhibitory synapses in the same neuron (By similarity). May also be involved in ascorbate (vitamin C) uptake via its interaction with SLC23A2/SVCT2. Complex formation with APBA2 and APP, stabilizes APP metabolism and enhances APBA2-mediated suppression of beta-APP40 secretion, due to the retardation of intracellular APP maturation (Probable)
Subcellular location: Postsynaptic cell membrane; Single-pass type I membrane protein. Endoplasmic reticulum membrane; Single-pass type I membrane protein. Golgi apparatus membrane; Single-pass type I membrane protein. Cell projection, dendrite. Note=Most prominent in the postsynaptic specializations of asymmetric (type I) synapses with both axodendritic and axospinous localization
Sequence: MTLLLLPLLLASLLASCSCNKANKHKPWIEAEYQGIVMENDNTVLLNPPLFALDKDAPLRYAGEICGFRLHGSGVPFEAVILDKATGEGLIRAKEPVDCEAQKEHTFTIQAYDCGEGPDGANTKKSHKATVHVRVNDVNEFAPVFVERLYRAAVTEGKLYDRILRVEAIDGDCSPQYSQICYYEILTPNTPFLIDNDGNIENTEKLQYSGERLYKFTVTAYDCGKKRAADDAEVEIQVKPTCKPSWQGWNKRIEYAPGAGSLALFPGIRLETCDEPLWNIQATIELQTSHVAKGCDRDNYSERALRKLCGAATGEVDLLPMPGPNANWTAGLSVHYSQDSSLIYWFNGTQAVQVPLGGPSGLGSGPQDSLSDHFTLSFWMKHGVTPNKGKKEEETIVCNTVQNEDGFSHYSLTVHGCRIAFLYWPLLESARPVKFLWKLEQVCDDEWHHYALNLEFPTVTLYTDGISFDPALIHDNGLIHPPRREPALMIGACWTEEKNKEKEKGDNSTDTTQGDPLSIHHYFHGYLAGFSVRSGRLESREVIECLYACREGLDYRDFESLGKGMKVHVNPSQSLLTLEGDDVETFNHALQHVAYMNTLRFATPGVRPLRLTTAVKCFSEESCVSIPEVEGYVVVLQPDAPQILLSGTAHFARPAVDFEGTNGVPLFPDLQITCSISHQVEAKKDESWQGTVTDTRMSDEIVHNLDGCEISLVGDDLDPERESLLLDTTSLQQRGLELTNTSAYLTIAGVESITVYEEILRQARYRLRHGAALYTRKFRLSCSEMNGRYSSNEFIVEVNVLHSMNRVAHPSHVLSSQQFLHRGHQPPPEMAGHSLASSHRNSMIPSAATLIIVVCVGFLVLMVVLGLVRIHSLHRRVSGAGGPPGASSDPKDPDLFWDDSALTIIVNPMESYQNRQSCVTGAVGGQQEDEDSSDSEVADSPSSDERRIIETPPHRY
InterPro domains: - IPR002126: Cadherin-like (domain) [29-246]
- IPR015919: Cadherin-like superfamily (homologous_superfamily) [25-243]
- IPR013320: Concanavalin A-like lectin/glucanase domain superfamily (homologous_superfamily) [315-549]
- IPR045588: Calsyntenin, C-terminal (domain) [559-912]
Interaction partners: - Neurexin-1
- Neurexin-2
Gene Ontology annotations:
Molecular Function (MF): GO:0003674 (molecular function), GO:0005488 (binding), GO:0005515 (protein binding)
Biological Process (BP): GO:0008150 (biological process), GO:0065007 (biological regulation), GO:0048518 (positive regulation of biological process), GO:0050789 (regulation of biological process), GO:0048583 (regulation of response to stimulus), GO:0023051 (regulation of signaling), GO:0023056 (positive regulation of signaling), GO:0048584 (positive regulation of response to stimulus), GO:0050794 (regulation of cellular process), GO:0048522 (positive regulation of cellular process), GO:0009967 (positive regulation of signal transduction), GO:0010647 (positive regulation of cell communication), GO:0009966 (regulation of signal transduction), GO:0010646 (regulation of cell communication), GO:0030111 (regulation of Wnt signaling pathway), GO:0030177 (positive regulation of Wnt signaling pathway), GO:0060828 (regulation of canonical Wnt signaling pathway), GO:0090263 (positive regulation of canonical Wnt signaling pathway)
Cellular Component (CC): GO:0005575 (cellular component), GO:0032991 (protein-containing complex), GO:0110165 (cellular anatomical entity), GO:0043226 (organelle), GO:0016020 (membrane), GO:0005615 (extracellular space), GO:0043235 (receptor complex), GO:0071944 (cell periphery), GO:0005576 (extracellular region), GO:0070062 (extracellular exosome), GO:0043227 (membrane-bounded organelle), GO:0005886 (plasma membrane), GO:0043230 (extracellular organelle), GO:0065010 (extracellular membrane-bounded organelle), GO:0031982 (vesicle), GO:1903561 (extracellular vesicle)