LKB1 associates with Brg1 and is necessary for Brg1-induced growth arrest

J Biol Chem. 2001 Aug 31;276(35):32415-8. doi: 10.1074/jbc.C100207200. Epub 2001 Jul 9.

Abstract

Inactivating mutations in the serine-threonine kinase LKB1 (STK11) are found in most patients with Peutz-Jeghers syndrome; however the function of LKB1 is unknown. We found that LKB1 binds to and regulates brahma-related gene 1 (Brg1), an essential component of chromatin remodeling complexes. The association requires the N terminus of LKB1 and the helicase domain of Brg1 and LKB1 stimulates the ATPase activity of Brg1. Brg1 expression in SW13 cells induces the formation of flat cells indicative of cell cycle arrest and senescence. Expression of a kinase-dead mutant of LKB1, SL26, in SW13 cells blocks the formation of Brg1-induced flat cells, indicating that LKB1 is required for Brg1-dependent growth arrest. The inability of mutants of LKB1 to mediate Brg1-dependent growth arrest may explain the manifestations of Peutz-Jeghers syndrome.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Adenosine Triphosphatases / metabolism
  • Binding Sites
  • Cell Cycle / physiology*
  • Cell Division / physiology*
  • Cloning, Molecular
  • DNA Helicases / chemistry
  • DNA Helicases / metabolism
  • Gene Library
  • HeLa Cells
  • Humans
  • Kinetics
  • Nuclear Proteins / chemistry
  • Nuclear Proteins / genetics
  • Nuclear Proteins / metabolism*
  • Peutz-Jeghers Syndrome / genetics
  • Peutz-Jeghers Syndrome / metabolism
  • Protein-Serine-Threonine Kinases / chemistry
  • Protein-Serine-Threonine Kinases / genetics
  • Protein-Serine-Threonine Kinases / metabolism*
  • Recombinant Proteins / chemistry
  • Recombinant Proteins / metabolism
  • Transcription Factors / chemistry
  • Transcription Factors / genetics
  • Transcription Factors / metabolism*
  • Transfection
  • Tumor Cells, Cultured

Substances

  • Nuclear Proteins
  • Recombinant Proteins
  • Transcription Factors
  • STK11 protein, human
  • Protein-Serine-Threonine Kinases
  • Adenosine Triphosphatases
  • SMARCA4 protein, human
  • DNA Helicases