| Structural highlights
Disease
[CSKP_HUMAN] Defects in CASK are the cause of mental retardation and microcephaly with pontine and cerebellar hypoplasia (MICPCH) [MIM:300749]. A disorder characterized by significantly below average general intellectual functioning associated with impairments in adaptative behavior and manifested during the developmental period. Patients with mental retardation X-linked CASK-related can manifest a severe phenotype consisting of severe intellectual deficit, congenital or postnatal microcephaly, disproportionate brainstem and cerebellar hypoplasia. A milder phenotype consists of mental retardation alone or associated with nystagmus.[1] Defects in CASK are the cause of FG syndrome type 4 (FGS4) [MIM:300422]. FG syndrome (FGS) is an X-linked disorder characterized by mental retardation, relative macrocephaly, hypotonia and constipation.[2]
Function
[CSKP_HUMAN] Multidomain scaffolding protein with a role in synaptic transmembrane protein anchoring and ion channel trafficking. Contributes to neural development and regulation of gene expression via interaction with the transcription factor TRB1. Binds to cell-surface proteins, including amyloid precursor protein, neurexins and syndecans. May mediate a link between the extracellular matrix and the actin cytoskeleton via its interaction with syndecan and with the actin/spectrin-binding protein 4.1.
Publication Abstract from PubMed
CASK (Ca(2+)/calmodulin-dependent Ser/Thr kinase) is a member of the MAGUK (membrane-associated guanylate kinase) family that functions as neurexin kinases with roles implicated in neuronal synapses and trafficking. The lack of a canonical DFG motif, which is altered to GFG in CASK, led to the classification as a pseudokinase. However, functional studies revealed that CASK can still phosphorylate substrates in the absence of divalent metals. CASK dysfunction has been linked to many diseases, including colorectal cancer, Parkinson's disease, and X-linked mental retardation, suggesting CASK as a potential drug target. Here, we exploited structure-based design for the development of highly potent and selective CASK inhibitors based on 2,4-diaminopyrimidine-5-carboxamides targeting an unusual pocket created by the GFG motif. The presented inhibitor design offers a more general strategy for the development of pseudokinase ligands that harbor unusual sequence motifs. It also provides a first chemical probe for studying the biological roles of CASK.
Design and Development of a Chemical Probe for Pseudokinase Ca(2+)/calmodulin-Dependent Ser/Thr Kinase.,Russ N, Schroder M, Berger BT, Mandel S, Aydogan Y, Mauer S, Pohl C, Drewry DH, Chaikuad A, Muller S, Knapp S J Med Chem. 2021 Oct 14;64(19):14358-14376. doi: 10.1021/acs.jmedchem.1c00845., Epub 2021 Sep 20. PMID:34543009[3]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Najm J, Horn D, Wimplinger I, Golden JA, Chizhikov VV, Sudi J, Christian SL, Ullmann R, Kuechler A, Haas CA, Flubacher A, Charnas LR, Uyanik G, Frank U, Klopocki E, Dobyns WB, Kutsche K. Mutations of CASK cause an X-linked brain malformation phenotype with microcephaly and hypoplasia of the brainstem and cerebellum. Nat Genet. 2008 Sep;40(9):1065-7. doi: 10.1038/ng.194. PMID:19165920 doi:10.1038/ng.194
- ↑ Piluso G, D'Amico F, Saccone V, Bismuto E, Rotundo IL, Di Domenico M, Aurino S, Schwartz CE, Neri G, Nigro V. A missense mutation in CASK causes FG syndrome in an Italian family. Am J Hum Genet. 2009 Feb;84(2):162-77. doi: 10.1016/j.ajhg.2008.12.018. Epub 2009, Feb 5. PMID:19200522 doi:10.1016/j.ajhg.2008.12.018
- ↑ Russ N, Schroder M, Berger BT, Mandel S, Aydogan Y, Mauer S, Pohl C, Drewry DH, Chaikuad A, Muller S, Knapp S. Design and Development of a Chemical Probe for Pseudokinase Ca(2+)/calmodulin-Dependent Ser/Thr Kinase. J Med Chem. 2021 Oct 14;64(19):14358-14376. doi: 10.1021/acs.jmedchem.1c00845., Epub 2021 Sep 20. PMID:34543009 doi:http://dx.doi.org/10.1021/acs.jmedchem.1c00845
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