MRCKα
MRCKα (CDC42BPA) is a CDC42-binding serine/threonine kinase that promotes cytoskeletal reorganization downstream of CDC42[1]. Mechanistically, MRCKα catalytic activity depends on N-terminal dimerization, trans-autophosphorylation, and relief of inhibitory kinase-coiled-coil interactions[2]. This regulation connects MRCKα to actomyosin signaling, because CDC42-MRCK and Rho-ROCK pathways cooperate in myosin phosphorylation and cancer cell invasion[3]. In epithelial models, caspase-cleaved MRCKα assembles an apical actin ring that drives apoptotic epithelial cell extrusion[4]. Compared with related isoforms, MRCKα and MRCKβ are broadly expressed, whereas MRCKγ expression is restricted mainly to heart and skeletal muscle[5]. Human MRCKα also shows multiple alternative splicing events that expand functional diversity[6]. For experimental applications, BDP5290 reduces MLC phosphorylation, cell motility, and tumor-cell invasion, while BDP8900 and BDP9066 support studies of MRCK-dependent cancer viability, migration, and invasion[7][8].- MRCKα studies fit cytoskeletal remodeling, epithelial extrusion, cancer invasion, and kinase-regulation projects[1][3][4]. - Isoform controls should separate MRCKα/MRCKβ from muscle-enriched MRCKγ expression contexts[5].
References:
- [1]. Leung T, et al. Myotonic dystrophy kinase-related Cdc42-binding kinase acts as a Cdc42 effector in promoting cytoskeletal reorganization. Mol Cell Biol. 1998 Jan;18(1):130-40. [Content Brief]
- [2]. Tan I, et al. Intermolecular and intramolecular interactions regulate catalytic activity of myotonic dystrophy kinase-related Cdc42-binding kinase alpha. Mol Cell Biol. 2001 Apr;21(8):2767-78. [Content Brief]
- [3]. Wilkinson S, et al. Cdc42-MRCK and Rho-ROCK signalling cooperate in myosin phosphorylation and cell invasion. Nat Cell Biol. 2005 Mar;7(3):255-61. [Content Brief]
- [4]. Gagliardi PA, et al. MRCKα is activated by caspase cleavage to assemble an apical actin ring for epithelial cell extrusion. J Cell Biol. 2018 Jan 2;217(1):231-249. [Content Brief]
- [5]. Ng Y, et al. Expression of the human myotonic dystrophy kinase-related Cdc42-binding kinase gamma is regulated by promoter DNA methylation and Sp1 binding. J Biol Chem. 2004 Aug 13;279(33):34156-64. [Content Brief]
- [6]. Tan I, et al. Genomic organization of human myotonic dystrophy kinase-related Cdc42-binding kinase alpha reveals multiple alternative splicing and functional diversity. Gene. 2003 Jan 30;304:107-15. [Content Brief]
- [7]. Unbekandt M, et al. A novel small-molecule MRCK inhibitor blocks cancer cell invasion. Cell Commun Signal. 2014 Oct 5;12:54. [Content Brief]
- [8]. Unbekandt M, et al. Discovery of Potent and Selective MRCK Inhibitors with Therapeutic Effect on Skin Cancer. Cancer Res. 2018 Apr 15;78(8):2096-2114. [Content Brief]
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