A proteomic study of SUMO-2 target proteins

A C O Vertegaal, S C Ogg, E Jaffray, M S Rodriguez, R T Hay, J S Andersen, M Mann, A I Lamond

Research output: Contribution to journalArticlepeer-review

192 Citations (Scopus)

Abstract

The SUMO family in vertebrates includes at least three distinct proteins ( SUMO-1, -2, and -3) that are added as post-translational modifications to target proteins. A considerable number of SUMO-1 target proteins have been identified, but little is known about SUMO-2. A stable HeLa cell line expressing His(6)-tagged SUMO-2 was established and used to label and purify novel endogenous SUMO-2 target proteins. Tagged forms of SUMO-2 were functional and localized predominantly in the nucleus. His(6)-tagged SUMO-2 conjugates were affinity-purified from nuclear fractions and identified by mass spectrometry. Eight novel potential SUMO-2 target proteins were identified by at least two peptides. Three of these proteins, SART1, heterogeneous nuclear ribonucleoprotein (RNP) M, and the U5 small nuclear RNP 200-kDa helicase, play a role in RNA metabolism. SART1 and heterogeneous nuclear RNP M were both shown to be genuine SUMO targets, confirming the validity of the approach.

Original languageEnglish
Pages (from-to)33791-33798
Number of pages8
JournalJournal of Biological Chemistry
Volume279
DOIs
Publication statusPublished - 6 Aug 2004

Keywords

  • UBIQUITIN-LIKE PROTEIN
  • NUCLEAR-PORE COMPLEX
  • GTPASE-ACTIVATING PROTEIN
  • CONJUGATING ENZYME
  • CELL-CYCLE
  • PROMYELOCYTIC LEUKEMIA
  • SUBSTRATE RECOGNITION
  • YEAST SEPTINS/
  • E3 LIGASE
  • RANGAP1

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