Protein CASK PDB 1kgd.png
Available structures
PDBOrtholog search: PDBe RCSB
AliasesCASK, CAGH39, CAMGUK, CMG, FGS4, LIN2, MICPCH, MRXSNA, TNRC8, calcium/calmodulin-dependent serine protein kinase (MAGUK family), calcium/calmodulin dependent serine protein kinase, hCASK
External IDsOMIM: 300172 MGI: 1309489 HomoloGene: 2736 GeneCards: CASK
RefSeq (mRNA)



RefSeq (protein)



Location (UCSC)Chr X: 41.51 – 41.92 MbChr X: 13.38 – 13.72 Mb
PubMed search[3][4]
View/Edit HumanView/Edit Mouse

Peripheral plasma membrane protein CASK is a protein that in humans is encoded by the CASK gene.[5][6] This gene is also known by several other names: CMG 2 (CAMGUK protein 2), calcium/calmodulin-dependent serine protein kinase 3 and membrane-associated guanylate kinase 2.


This gene is located on the short arm of the X chromosome (Xp11.4). It is 404,253 bases in length and lies on the Crick (minus) strand. The encoded protein has 926 amino acids with a predicted molecular weight of 105,123 Daltons.


This protein is a multidomain scaffolding protein with a role in synaptic transmembrane protein anchoring and ion channel trafficking. It interacts with the transcription factor TBR1 and binds to several cell-surface proteins including neurexins and syndecans.

Clinical importance

This gene has been implicated in X-linked mental retardation,[7] including specifically mental retardation and microcephaly with pontine and cerebellar hypoplasia.[8]


CASK has been shown to interact with:


  1. ^ a b c GRCh38: Ensembl release 89: ENSG00000147044 - Ensembl, May 2017
  2. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000031012 - Ensembl, May 2017
  3. ^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  5. ^ Dimitratos SD, Stathakis DG, Nelson CA, Woods DF, Bryant PJ (Nov 1998). "The location of human CASK at Xp11.4 identifies this gene as a candidate for X-linked optic atrophy". Genomics. 51 (2): 308–309. doi:10.1006/geno.1998.5404. PMID 9722958.
  6. ^ "Entrez Gene: CASK Calcium/calmodulin-dependent serine protein kinase (MAGUK family)".
  7. ^ Tarpey PS, Smith R, Pleasance E, Whibley A, Edkins S, Hardy C, O'Meara S, Latimer C, Dicks E, Menzies A, Stephens P, Blow M, Greenman C, Xue Y, Tyler-Smith C, Thompson D, Gray K, Andrews J, Barthorpe S, Buck G, Cole J, Dunmore R, Jones D, Maddison M, Mironenko T, Turner R, Turrell K, Varian J, West S, Widaa S, Wray P, Teague J, Butler A, Jenkinson A, Jia M, Richardson D, Shepherd R, Wooster R, Tejada MI, Martinez F, Carvill G, Goliath R, de Brouwer AP, van Bokhoven H, Van Esch H, Chelly J, Raynaud M, Ropers HH, Abidi FE, Srivastava AK, Cox J, Luo Y, Mallya U, Moon J, Parnau J, Mohammed S, Tolmie JL, Shoubridge C, Corbett M, Gardner A, Haan E, Rujirabanjerd S, Shaw M, Vandeleur L, Fullston T, Easton DF, Boyle J, Partington M, Hackett A, Field M, Skinner C, Stevenson RE, Bobrow M, Turner G, Schwartz CE, Gecz J, Raymond FL, Futreal PA, Stratton MR (May 2009). "A systematic, large-scale resequencing screen of X-chromosome coding exons in mental retardation". Nat. Genet. 41 (5): 535–43. doi:10.1038/ng.367. PMC 2872007. PMID 19377476.
  8. ^ Burglen L, Chantot-Bastaraud S, Garel C, Milh M, Touraine R, Zanni G, Petit F, Afenjar A, Goizet C, Barresi S, Coussement A, Ioos C, Lazaro L, Joriot S, Desguerre I, Lacombe D, des Portes V, Bertini E, Siffroi JP, de Villemeur TB, Rodriguez D (2012). "Spectrum of pontocerebellar hypoplasia in 13 girls and boys with CASK mutations: confirmation of a recognizable phenotype and first description of a male mosaic patient". Orphanet Journal of Rare Diseases. 7 (18): 18. doi:10.1186/1750-1172-7-18. PMC 3351739. PMID 22452838.
  9. ^ a b Leonoudakis D, Conti LR, Anderson S, Radeke CM, McGuire LM, Adams ME, Froehner SC, Yates JR, Vandenberg CA (May 2004). "Protein trafficking and anchoring complexes revealed by proteomic analysis of inward rectifier potassium channel (Kir2.x)-associated proteins". J. Biol. Chem. 279 (21): 22331–46. doi:10.1074/jbc.M400285200. PMID 15024025.
  10. ^ a b c d Leonoudakis D, Conti LR, Radeke CM, McGuire LM, Vandenberg CA (April 2004). "A multiprotein trafficking complex composed of SAP97, CASK, Veli, and Mint1 is associated with inward rectifier Kir2 potassium channels". J. Biol. Chem. 279 (18): 19051–63. doi:10.1074/jbc.M400284200. PMID 14960569.
  11. ^ a b Borg JP, Straight SW, Kaech SM, de Taddéo-Borg M, Kroon DE, Karnak D, Turner RS, Kim SK, Margolis B (November 1998). "Identification of an evolutionarily conserved heterotrimeric protein complex involved in protein targeting". J. Biol. Chem. 273 (48): 31633–6. doi:10.1074/jbc.273.48.31633. PMID 9822620.
  12. ^ Borg JP, Lõpez-Figueroa MO, de Taddèo-Borg M, Kroon DE, Turner RS, Watson SJ, Margolis B (February 1999). "Molecular analysis of the X11-mLin-2/CASK complex in brain". J. Neurosci. 19 (4): 1307–16. doi:10.1523/JNEUROSCI.19-04-01307.1999. PMC 6786035. PMID 9952408.
  13. ^ Schuh K, Uldrijan S, Gambaryan S, Roethlein N, Neyses L (March 2003). "Interaction of the plasma membrane Ca2+ pump 4b/CI with the Ca2+/calmodulin-dependent membrane-associated kinase CASK". J. Biol. Chem. 278 (11): 9778–83. doi:10.1074/jbc.M212507200. PMID 12511555.
  14. ^ Wang GS, Hong CJ, Yen TY, Huang HY, Ou Y, Huang TN, Jung WG, Kuo TY, Sheng M, Wang TF, Hsueh YP (April 2004). "Transcriptional modification by a CASK-interacting nucleosome assembly protein". Neuron. 42 (1): 113–28. doi:10.1016/S0896-6273(04)00139-4. PMID 15066269.
  15. ^ a b Chetkovich DM, Bunn RC, Kuo SH, Kawasaki Y, Kohwi M, Bredt DS (August 2002). "Postsynaptic targeting of alternative postsynaptic density-95 isoforms by distinct mechanisms". J. Neurosci. 22 (15): 6415–25. doi:10.1523/JNEUROSCI.22-15-06415.2002. PMC 6758133. PMID 12151521.
  16. ^ Nix SL, Chishti AH, Anderson JM, Walther Z (December 2000). "hCASK and hDlg associate in epithelia, and their src homology 3 and guanylate kinase domains participate in both intramolecular and intermolecular interactions". J. Biol. Chem. 275 (52): 41192–200. doi:10.1074/jbc.M002078200. PMID 10993877.
  17. ^ Martinez-Estrada OM, Villa A, Breviario F, Orsenigo F, Dejana E, Bazzoni G (March 2001). "Association of junctional adhesion molecule with calcium/calmodulin-dependent serine protein kinase (CASK/LIN-2) in human epithelial caco-2 cells". J. Biol. Chem. 276 (12): 9291–6. doi:10.1074/jbc.M006991200. PMID 11120739.
  18. ^ Ebnet K, Schulz CU, Meyer Zu Brickwedde MK, Pendl GG, Vestweber D (September 2000). "Junctional adhesion molecule interacts with the PDZ domain-containing proteins AF-6 and ZO-1". J. Biol. Chem. 275 (36): 27979–88. doi:10.1074/jbc.M002363200. PMID 10856295.
  19. ^ Qi J, Su Y, Sun R, Zhang F, Luo X, Yang Z, Luo X (March 2005). "CASK inhibits ECV304 cell growth and interacts with Id1". Biochem. Biophys. Res. Commun. 328 (2): 517–21. doi:10.1016/j.bbrc.2005.01.014. PMID 15694377.
  20. ^ Lehtonen S, Lehtonen E, Kudlicka K, Holthöfer H, Farquhar MG (September 2004). "Nephrin forms a complex with adherens junction proteins and CASK in podocytes and in Madin-Darby canine kidney cells expressing nephrin". Am. J. Pathol. 165 (3): 923–36. doi:10.1016/S0002-9440(10)63354-8. PMC 1618613. PMID 15331416.
  21. ^ Fallon L, Moreau F, Croft BG, Labib N, Gu WJ, Fon EA (January 2002). "Parkin and CASK/LIN-2 associate via a PDZ-mediated interaction and are co-localized in lipid rafts and postsynaptic densities in brain". J. Biol. Chem. 277 (1): 486–91. doi:10.1074/jbc.M109806200. PMID 11679592.
  22. ^ a b Zhang Y, Luan Z, Liu A, Hu G (May 2001). "The scaffolding protein CASK mediates the interaction between rabphilin3a and beta-neurexins". FEBS Lett. 497 (2–3): 99–102. doi:10.1016/S0014-5793(01)02450-4. PMID 11377421.
  23. ^ Cohen AR, Woods DF, Marfatia SM, Walther Z, Chishti AH, Anderson JM, Wood DF (July 1998). "Human CASK/LIN-2 binds syndecan-2 and protein 4.1 and localizes to the basolateral membrane of epithelial cells". J. Cell Biol. 142 (1): 129–38. doi:10.1083/jcb.142.1.129. PMC 2133028. PMID 9660868.

Further reading