DLGAP4

Discs, large (Drosophila) homolog-associated protein 4
Identifiers
Symbols	DLGAP4; DAP4; DLP4; FLJ20588; KIAA0964; MGC131862; RP5-977B1.6; SAPAP4
External IDs	MGI: 2138865 HomoloGene: 8935 GeneCards: DLGAP4 Gene
Gene Ontology Molecular function • protein binding Cellular component • membrane Biological process • cell-cell signaling Sources: Amigo / QuickGO
RNA expression pattern
More reference expression data
Orthologs
Species	Human	Mouse
Entrez	22839	228836
Ensembl	ENSG00000080845	ENSMUSG00000061689
UniProt	Q9Y2H0	n/a
RefSeq (mRNA)	NM_001042486.2	NM_001042487
RefSeq (protein)	NP_001035951.1	NP_001035952
Location (UCSC)	Chr 20: 34.89 – 35.16 Mb	Chr 2: 156.44 – 156.59 Mb
PubMed search	[1]	[2]

Disks large-associated protein 4 (DAP-4) also known as SAP90/PSD-95-associated protein 4 (SAPAP-4) is a protein that in humans is encoded by the DLGAP4 gene.^[1][2]

Function

DAP-4 is a membrane-associated guanylate kinase found at the postsynaptic density in neuronal cells. It is a signaling molecule that can interact with potassium channels and receptors, as well as other signaling molecules. DAP-4 can interact with PSD-95 through its guanylate kinase domain and may be involved in clustering PSD-95 in the postsynaptic density region. The encoded protein is one of at least four similar proteins that have been found. Alternatively spliced transcript variants encoding different isoforms have been found for this gene.^[2]

References

1. ^ Takeuchi M, Hata Y, Hirao K, Toyoda A, Irie M, Takai Y (Jun 1997). "SAPAPs. A family of PSD-95/SAP90-associated proteins localized at postsynaptic density". J Biol Chem 272 (18): 11943–51. doi:10.1074/jbc.272.18.11943. PMID 9115257. 
2. ^ ^{a b} "Entrez Gene: DLGAP4 discs, large (Drosophila) homolog-associated protein 4". http://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=22839. 

Further reading

• Kim JH, Liao D, Lau LF, Huganir RL (1998). "SynGAP: a synaptic RasGAP that associates with the PSD-95/SAP90 protein family". Neuron 20 (4): 683–91. doi:10.1016/S0896-6273(00)81008-9. PMID 9581761. 
• Chen HJ, Rojas-Soto M, Oguni A, Kennedy MB (1998). "A synaptic Ras-GTPase activating protein (p135 SynGAP) inhibited by CaM kinase II". Neuron 20 (5): 895–904. doi:10.1016/S0896-6273(00)80471-7. PMID 9620694. 
• Nagase T, Ishikawa K, Suyama M et al. (1999). "Prediction of the coding sequences of unidentified human genes. XIII. The complete sequences of 100 new cDNA clones from brain which code for large proteins in vitro". DNA Res. 6 (1): 63–70. doi:10.1093/dnares/6.1.63. PMID 10231032. 
• Kawabe H, Hata Y, Takeuchi M et al. (1999). "nArgBP2, a novel neural member of ponsin/ArgBP2/vinexin family that interacts with synapse-associated protein 90/postsynaptic density-95-associated protein (SAPAP)". J. Biol. Chem. 274 (43): 30914–8. doi:10.1074/jbc.274.43.30914. PMID 10521485. 
• Husi H, Ward MA, Choudhary JS et al. (2000). "Proteomic analysis of NMDA receptor-adhesion protein signaling complexes". Nat. Neurosci. 3 (7): 661–9. doi:10.1038/76615. PMID 10862698. 
• Pei L, Teves RL, Wallace MC, Gurd JW (2001). "Transient cerebral ischemia increases tyrosine phosphorylation of the synaptic RAS-GTPase activating protein, SynGAP". J. Cereb. Blood Flow Metab. 21 (8): 955–63. doi:10.1097/00004647-200108000-00008. PMID 11487731. 
• Deloukas P, Matthews LH, Ashurst J et al. (2002). "The DNA sequence and comparative analysis of human chromosome 20". Nature 414 (6866): 865–71. doi:10.1038/414865a. PMID 11780052. 
• Strausberg RL, Feingold EA, Grouse LH et al. (2003). "Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences". Proc. Natl. Acad. Sci. U.S.A. 99 (26): 16899–903. doi:10.1073/pnas.242603899. PMC 139241. PMID 12477932. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=139241. 
• Riefler GM, Balasingam G, Lucas KG et al. (2003). "Exocyst complex subunit sec8 binds to postsynaptic density protein-95 (PSD-95): a novel interaction regulated by cypin (cytosolic PSD-95 interactor)". Biochem. J. 373 (Pt 1): 49–55. doi:10.1042/BJ20021838. PMC 1223477. PMID 12675619. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=1223477. 
• Ota T, Suzuki Y, Nishikawa T et al. (2004). "Complete sequencing and characterization of 21,243 full-length human cDNAs". Nat. Genet. 36 (1): 40–5. doi:10.1038/ng1285. PMID 14702039. 
• Song B, Yan XB, Zhang GY (2004). "PSD-95 promotes CaMKII-catalyzed serine phosphorylation of the synaptic RAS-GTPase activating protein SynGAP after transient brain ischemia in rat hippocampus". Brain Res. 1005 (1–2): 44–50. doi:10.1016/j.brainres.2004.01.032. PMID 15044063. 
• Brandenberger R, Wei H, Zhang S et al. (2005). "Transcriptome characterization elucidates signaling networks that control human ES cell growth and differentiation". Nat. Biotechnol. 22 (6): 707–16. doi:10.1038/nbt971. PMID 15146197. 
• Kimura K, Wakamatsu A, Suzuki Y et al. (2006). "Diversification of transcriptional modulation: large-scale identification and characterization of putative alternative promoters of human genes". Genome Res. 16 (1): 55–65. doi:10.1101/gr.4039406. PMC 1356129. PMID 16344560. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=1356129.