17β-estradiol Regulates Estrogen Receptor α Monoubiquitination

Monoubiquitination is a nonproteolytic signal involved in a network of several different physiological processes. Recently, monoubiquitination has been discovered as a new post-transductional modification of the estrogen receptor α (ERα). However, at present no information is available about the role of the cognate ligand 17β-estradiol (E2) in modulating this receptor post-transductional modification. Thus, we studied the E2-dependent modulation of ERα monoubiquitination in different cell lines. Here, we report that ERα monoubiquitination isnegatively modulated by E2. These results demonstrate thatERα monoubiquitination represents a new signalling modification that may modulate the E2:ERα-regulated cellular processes.