MKL1 is SUMOylated with SUMO1 at lysine-499, lysine-576, and lysine-624 (Nakagawa and Kuzumaki 2005) SUMOylation represses transcriptional activity of MKL1. MKL1 is a coactivator of SRF.
Kuzumaki, N, Nakagawa, K
SUMO transferase activity of SUMO1:C93-UBE2I [cytoplasm]
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