p66Shc mediates SUMO2-induced endothelial dysfunction.

SUMO2 modification of p66Shc at lysine-81 mediates hyperlipidemia-induced endothelial dysfunction in mice.

• Why it matters: Understanding the molecular mechanisms behind increased sumoylation's detrimental effects on vascular health can inform targeted therapies for cardiovascular diseases.
• What they did: The study used cell-based assays, mass spectrometry, and genetically modified mice (Shc1 K81R) crossed with Ldlr -/- mice to investigate how SUMO2 regulates p66Shc function and endothelial signaling pathways.
• The result: SUMO2ylation of p66Shc promotes phosphorylation at serine-36, mitochondrial translocation, and endothelial dysfunction, while sumoylation-deficient p66Shc resists these effects, highlighting p66ShcK81 as a key upstream regulator.