Abstract
In this issue of Developmental Cell, Nacerddine et al. (2005) describe a targeted germ line mutation of the mouse SUMO-specific E2 Ubc9, which abrogates the SUMO conjugation pathway, broadly crippling nuclear function in proliferating cells of the early embryo. This study reveals the wide-ranging roles for this protein modifier in nuclear organization, chromosome segregation, and Ran-driven nucleo-cytoplasmic transport.
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