NRXN1

 Neurexin-1-alpha is a protein that in humans is encoded by the NRXN1 gene.^[5]

NRXN1
Available structures PDB Ortholog search: PDBe RCSB List of PDB id codes 3B3Q
Identifiers
Aliases	NRXN1, Hs.22998, PTHSL2, SCZD17, neurexin 1
External IDs	OMIM: 600565 MGI: 1096391 HomoloGene: 21005 GeneCards: NRXN1
Gene location (Human) Chr. Chromosome 2 (human)[1] Band 2p16.3 Start 49,918,503 bp[1] End 51,225,575 bp[1]
Gene location (Mouse) Chr. Chromosome 17 (mouse)[2] Band 17|17 E5 Start 90,033,631 bp[2] End 91,093,071 bp[2]
RNA expression pattern More reference expression data
Gene ontology Molecular function • metal ion binding • calcium-dependent protein binding • neuroligin family protein binding • receptor binding • transmembrane signaling receptor activity • cell adhesion molecule binding • GO:0001948 protein binding • type 1 fibroblast growth factor receptor binding • calcium ion binding • acetylcholine receptor binding • calcium channel regulator activity • signaling receptor activity Cellular component • integral component of membrane • vesicle • not the membrane • membrane • endocytic vesicle • axonal growth cone • synapse • cell surface • cell junction • neuronal cell body • endoplasmic reticulum • presynaptic membrane • cell membrane • integral component of presynaptic membrane • presynapse • integral component of plasma membrane • nucleolus • macromolecular complex • Schaffer collateral - CA1 synapse • glutamatergic synapse • GABA-ergic synapse • integral component of presynaptic active zone membrane Biological process • calcium-dependent cell-cell adhesion via plasma membrane cell adhesion molecules • receptor localization to synapse • heterophilic cell-cell adhesion via plasma membrane cell adhesion molecules • NMDA glutamate receptor clustering • establishment of protein localization • neuron cell-cell adhesion • gamma-aminobutyric acid receptor clustering • neuronal signal transduction • gephyrin clustering involved in postsynaptic density assembly • postsynaptic density protein 95 clustering • learning • regulation of AMPA receptor activity • negative regulation of filopodium assembly • presynaptic membrane assembly • regulation of NMDA receptor activity • vocalization behavior • neuroligin clustering involved in postsynaptic membrane assembly • adult behavior • positive regulation of synaptic transmission, glutamatergic • postsynaptic membrane assembly • cell adhesion • angiogenesis • positive regulation of excitatory postsynaptic potential • social organism behavior • guanylate kinase-associated protein clustering • synapse assembly • protein complex assembly involved in synapse maturation • synaptic vesicle clustering • protein localization to synapse • signal transduction • cerebellar granule cell differentiation • positive regulation of synapse assembly • positive regulation of presynaptic active zone assembly • positive regulation of protein localization to plasma membrane • positive regulation of gene expression • negative regulation of gene expression • positive regulation of protein kinase A signaling • neuron projection development • positive regulation of peptidyl-serine phosphorylation • positive regulation of fibroblast growth factor receptor signaling pathway • positive regulation of protein kinase B signaling • positive regulation of ERK1 and ERK2 cascade • cellular response to calcium ion • positive regulation of protein kinase C activity • vocal learning • chemical synaptic transmission • regulation of insulin secretion involved in cellular response to glucose stimulus • axon guidance • prepulse inhibition • neuromuscular process controlling balance • positive regulation of synapse maturation • GO:0010554 neurotransmitter secretion • regulation of grooming behavior • synaptic membrane adhesion • regulation of synaptic vesicle cycle • regulation of postsynaptic specialization assembly • regulation of presynapse assembly • regulation of postsynaptic density assembly • trans-synaptic signaling by endocannabinoid Sources:Amigo / QuickGO
Orthologs
Species	Human	Mouse
Entrez	9378	18189
Ensembl	ENSG00000179915	ENSMUSG00000024109
UniProt	P58400 Q9ULB1 Q49A31	P0DI97 Q9CS84
RefSeq (mRNA)	NM_001135659 NM_004801 NM_138735 NM_001320156 NM_001320157 NM_001330077 NM_001330078 NM_001330079 NM_001330081 NM_001330082 NM_001330083 NM_001330084 NM_001330085 NM_001330086 NM_001330087 NM_001330088 NM_001330089 NM_001330090 NM_001330091 NM_001330092 NM_001330093 NM_001330094 NM_001330095 NM_001330096 NM_001330097	NM_020252 NM_177284 NM_001346957 NM_001346958 NM_001346959 NM_001346960 NM_001346961 NM_001346962 NM_001347419
RefSeq (protein)	NP_001129131 NP_001307085 NP_001307086 NP_001317006 NP_001317007 NP_001317008 NP_001317010 NP_001317011 NP_001317012 NP_001317013 NP_001317014 NP_001317015 NP_001317016 NP_001317017 NP_001317018 NP_001317019 NP_001317020 NP_001317021 NP_001317022 NP_001317023 NP_001317024 NP_001317025 NP_001317026 NP_004792 NP_620072 NP_001129131.1 NP_004792.1 NP_620072.1 NP_004792.1 NP_004792.1 NP_620072.1	NP_001333886 NP_001333887 NP_001333888 NP_001333889 NP_001333890 NP_001333891 NP_001334348 NP_064648 NP_796258 NP_064648.3 NP_796258.2
Location (UCSC)	Chr 2: 49.92 – 51.23 Mb	Chr 17: 90.03 – 91.09 Mb
PubMed search	[3]	[4]
Wikidata
View/Edit Human View/Edit Mouse

Neurexins are a family of proteins that function in the vertebrate nervous system as cell adhesion molecules and receptors. They are encoded by several unlinked genes of which two, NRXN1 and NRXN3, are among the largest known human genes. Three of the genes (NRXN1-3) utilize two alternate promoters and include numerous alternatively spliced exons to generate thousands of distinct mRNA transcripts and protein isoforms. The majority of transcripts are produced from the upstream promoter and encode alpha-neurexin isoforms; a much smaller number of transcripts are produced from the downstream promoter and encode beta-neurexin isoforms. The alpha-neurexins contain epidermal growth factor-like (EGF-like) sequences and laminin G domains, and have been shown to interact with neurexophilins. The beta-neurexins lack EGF-like sequences and contain fewer laminin G domains than alpha-neurexins.^[5]

FunctionEdit

Neurexins are presynaptic membrane cell-adhesion molecules that bind primarily to neuroligins, proteins that have been associated with autism. Autism is characterized by a wide range of social and cognitive deficits, which are partially attributed to faulty synaptic communication between neurons.^[6] This lack of communication is oftentimes tied to mutations in NRXN1. Structural variants of NRXN1a (neurexin1 alpha) are consistent with mutations predisposing autism.^[7] These alpha neurexins are involved in communication through coupling mechanisms of calcium channels and vesicle exocytosis, to ensure that neurotransmitters are properly released. They are specifically required for glutamate and GABA release.^[8] Implications of neurexin involvement in autism have been determined through deletion in coding exons of NRXN1a, particularly in knockout mice models. These mice showed impaired social functioning, decreased motor response in new situations, and increased aggressive behavior in males.^[6] Social functioning was of major relevance for this gene and its association with autism spectrum disorder.

GenomicsEdit

The gene is found in a single copy on the short arm of chromosome 2 (2p16.3). The gene is 1,112,187 bases in length, is located on the Crick (minus) strand and encodes a protein of 1,477 amino acids (molecular weight 161.883 kDa).

Mutations of this gene that interrupt its expression have been associated with schizophrenia, autism, and intellectual disability (NRXN1 mutations and brain disorders).

InteractionsEdit

NRXN1 has been shown to interact with NLGN1.^[9][10]

This article uses material from the Wikipedia article  Metasyntactic variable, which is released under the  Creative Commons Attribution-ShareAlike 3.0 Unported License.