PIAS4 SUMOylates MDC1 at lysine residue K1840. The exact timing and regulation of this modification is not known (Luo et al. 2012, Yin et al. 2012).
Luo, K, Zhang, H, Wang, L, Yuan, J, Lou, Z
Yin, Y, Seifert, A, Chua, JS, Maure, JF, Golebiowski, F, Hay, RT
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