Metastases suppressor NM23-H2 interaction with G-quadruplex DNA within c-MYC promoter nuclease hypersensitive element induces c-MYC expression

Nucleic Acids Res. 2009 Jan;37(1):172-83. doi: 10.1093/nar/gkn919. Epub 2008 Nov 25.

Abstract

Regulatory influence of the G-quadruplex or G4 motif present within the nuclease hypersensitive element (NHE) in the promoter of c-MYC has been noted. On the other hand, association of NM23-H2 to the NHE leads to c-MYC activation. Therefore, NM23-H2 interaction with the G4 motif within the c-MYC NHE presents an interesting mechanistic possibility. Herein, using luciferase reporter assay and chromatin immunoprecipitation we show NM23-H2 mediated c-MYC activation involves NM23-H2-G4 motif binding within the c-MYC NHE. G4 motif complex formation with recombinant NM23-H2 was independently confirmed using fluorescence energy transfer, which also indicated that the G4 motif was resolved to an unfolded state within the protein-bound complex. Taken together, this supports transcriptional role of NM23-H2 via a G4 motif.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Binding Sites
  • Cell Line
  • DNA / chemistry*
  • Deoxyribonucleases / metabolism
  • G-Quadruplexes*
  • Genes, myc*
  • Humans
  • Mutation
  • NM23 Nucleoside Diphosphate Kinases / genetics
  • NM23 Nucleoside Diphosphate Kinases / metabolism*
  • Promoter Regions, Genetic*
  • Proto-Oncogene Proteins c-myc / biosynthesis
  • Transcriptional Activation*

Substances

  • NM23 Nucleoside Diphosphate Kinases
  • Proto-Oncogene Proteins c-myc
  • DNA
  • NME2 protein, human
  • Deoxyribonucleases