Modification of Akt by SUMO conjugation regulates alternative splicing and cell cycle

Guillermo Risso, Federico Pelisch, Berta Pozzi, Pablo Mammi, Matias Blaustein, Alejandro Colman-Lerner, Anabella Srebrow

    Research output: Contribution to journalArticlepeer-review

    13 Citations (Scopus)

    Abstract

    Akt/PKB is a key signaling molecule in higher eukaryotes and a crucial protein kinase in human health and disease. Phosphorylation, acetylation, and ubiquitylation have been reported as important regulatory post-translational modifications of this kinase. We describe here that Akt is modified by SUMO conjugation, and show that lysine residues 276 and 301 are the major SUMO attachment sites within this protein. We found that phosphorylation and SUMOylation of Akt appear as independent events. However, decreasing Akt SUMOylation levels severely affects the role of this kinase as a regulator of fibronectin and Bcl-x alternative splicing. Moreover, we observed that the Akt mutant (Akt E17K) found in several human tumors displays increased levels of SUMOylation and also an enhanced capacity to regulate fibronectin splicing patterns. This splicing regulatory activity is completely abolished by decreasing Akt E17K SUMO conjugation levels. Additionally, we found that SUMOylation controls Akt regulatory function at G1/S transition during cell cycle progression. These findings reveal SUMO conjugation as a novel level of regulation for Akt activity, opening new areas of exploration related to the molecular mechanisms involved in the diverse cellular functions of this kinase.
    Original languageEnglish
    Pages (from-to)3165-3174
    Number of pages10
    JournalCell Cycle
    Volume12
    Issue number19
    DOIs
    Publication statusPublished - 2013

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