Small GTP-binding protein Ran is regulated by posttranslational lysine acetylation

Susanne De Boor, Philipp Knyphausen, Nora Kuhlmann, Sarah Wroblowski, Julian Brenig, Lukas Scislowski, Linda Baldus, Hendrik Nolte, Marcus Krüger, Michael Lammers

Research output: Contribution to journalArticlepeer-review

61 Scopus citations

Abstract

Ran is a small GTP-binding protein of the Ras superfamily regulating fundamental cellular processes: nucleo-cytoplasmic transport, nuclear envelope formation and mitotic spindle assembly. An intracellular Ran•GTP/Ran•GDP gradient created by the distinct subcellular localization of its regulators RCC1 and RanGAP mediates many of its cellular effects. Recent proteomic screens identified five Ran lysine acetylation sites in human and eleven sites inmouse/rat tissues. Some of these sites are located in functionally highly important regions such as switch I and switch II. Here, we show that lysine acetylation interferes with essential aspects of Ran function: nucleotide exchange and hydrolysis, subcellular Ran localization, GTP hydrolysis, and the interaction with import and export receptors. Deacetylation activity of certain sirtuins was detected for two Ran acetylation sites in vitro. Moreover, Ran was acetylated by CBP/p300 and Tip60 in vitro and on transferase overexpression in vivo. Overall, this study addresses many important challenges of the acetylome field, which will be discussed.

Original languageEnglish
Pages (from-to)E3679-E3688
JournalProceedings of the National Academy of Sciences of the United States of America
Volume112
Issue number28
DOIs
StatePublished - 14 Jul 2015
Externally publishedYes

Keywords

  • Genetic code expansion concept
  • Lysine acetylation
  • Nuclear cytosolic transport
  • Nucleus
  • Ran

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