Lemur tyrosine kinase-2 signalling regulates kinesin-1 light chain-2 phosphorylation and binding of Smad2 cargo

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A recent genome-wide association study identified the gene encoding lemur tyrosine kinase-2 (LMTK2) as a susceptibility gene for prostate cancer. The identified genetic alteration is within intron 9, but the mechanisms by which LMTK2 may impact upon prostate cancer are not clear because the functions of LMTK2 are poorly understood. Here, we show that LMTK2 regulates a known pathway that controls phosphorylation of kinesin-1 light chain-2 (KLC2) by glycogen synthase kinase-3β (GSK3β). KLC2 phosphorylation by GSK3β induces the release of cargo from KLC2. LMTK2 signals via protein phosphatase-1C (PP1C) to increase inhibitory phosphorylation of GSK3β on serine-9 that reduces KLC2 phosphorylation and promotes binding of the known KLC2 cargo Smad2. Smad2 signals to the nucleus in response to transforming growth factor-β (TGFβ) receptor stimulation and transport of Smad2 by kinesin-1 is required for this signalling. We show that small interfering RNA loss of LMTK2 not only reduces binding of Smad2 to KLC2, but also inhibits TGFβ-induced Smad2 signalling. Thus, LMTK2 may regulate the activity of kinesin-1 motor function and Smad2 signalling.

Original languageEnglish
Pages (from-to)2773-82
Number of pages10
Issue number22
Publication statusPublished - 31 May 2012


  • Blotting, Western
  • Cell Nucleus/genetics
  • Cell Proliferation
  • Fluorescent Antibody Technique
  • Glycogen Synthase Kinase 3/genetics
  • Glycogen Synthase Kinase 3 beta
  • HeLa Cells
  • Humans
  • Immunoenzyme Techniques
  • Immunoprecipitation
  • Kinesins
  • Membrane Proteins/antagonists & inhibitors
  • Microtubule-Associated Proteins/genetics
  • Phosphorylation
  • Protein Phosphatase 1/genetics
  • Protein Serine-Threonine Kinases/antagonists & inhibitors
  • RNA, Messenger/genetics
  • RNA, Small Interfering/genetics
  • Real-Time Polymerase Chain Reaction
  • Receptors, Transforming Growth Factor beta/genetics
  • Signal Transduction
  • Smad2 Protein/genetics
  • Transforming Growth Factor beta/pharmacology
  • Two-Hybrid System Techniques


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