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10.1038/emboj.2011.78

http://scihub22266oqcxt.onion/10.1038/emboj.2011.78
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21423148!3101989!21423148
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suck abstract from ncbi


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pmid21423148      EMBO+J 2011 ; 30 (9): 1730-41
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  • MO25 is a master regulator of SPAK/OSR1 and MST3/MST4/YSK1 protein kinases #MMPMID21423148
  • Filippi BM; de los Heros P; Mehellou Y; Navratilova I; Gourlay R; Deak M; Plater L; Toth R; Zeqiraj E; Alessi DR
  • EMBO J 2011[May]; 30 (9): 1730-41 PMID21423148show ga
  • Mouse protein-25 (MO25) isoforms bind to the STRAD pseudokinase and stabilise it in a conformation that can activate the LKB1 tumour suppressor kinase. We demonstrate that by binding to several STE20 family kinases, MO25 has roles beyond controlling LKB1. These new MO25 targets are SPAK/OSR1 kinases, regulators of ion homeostasis and blood pressure, and MST3/MST4/YSK1, involved in controlling development and morphogenesis. Our analyses suggest that MO25alpha and MO25beta associate with these STE20 kinases in a similar manner to STRAD. MO25 isoforms induce approximately 100-fold activation of SPAK/OSR1 dramatically enhancing their ability to phosphorylate the ion cotransporters NKCC1, NKCC2 and NCC, leading to the identification of several new phosphorylation sites. siRNA-mediated reduction of expression of MO25 isoforms in mammalian cells inhibited phosphorylation of endogenous NKCC1 at residues phosphorylated by SPAK/OSR1, which is rescued by re-expression of MO25alpha. MO25alpha/beta binding to MST3/MST4/YSK1 also stimulated kinase activity three- to four-fold. MO25 has evolved as a key regulator of a group of STE20 kinases and may represent an ancestral mechanism of regulating conformation of pseudokinases and activating catalytically competent protein kinases.
  • |Animals[MESH]
  • |Calcium-Binding Proteins/*metabolism[MESH]
  • |Enzyme Activation/physiology[MESH]
  • |Escherichia coli[MESH]
  • |HEK293 Cells[MESH]
  • |Homeostasis/*physiology[MESH]
  • |Humans[MESH]
  • |Immunoblotting[MESH]
  • |Insecta[MESH]
  • |Intracellular Signaling Peptides and Proteins/*metabolism[MESH]
  • |Morphogenesis/*physiology[MESH]
  • |Phosphorylation[MESH]
  • |Protein Isoforms/metabolism[MESH]
  • |Protein Serine-Threonine Kinases/*metabolism[MESH]


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