Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10770250 | Biochemical and Biophysical Research Communications | 2005 | 9 Pages |
Abstract
Homo-oligomerization via a coiled-coil (C-C) domain has been shown to be necessary for the promyelocytic leukemia (PML)-retinoic acid receptor-α (RARα) fusion protein to acquire oncogenic potential in acute promyelocytic leukemia. We show here that PML(ÎC-C)-RARα, which contains a deletion in its C-C domain, is neither localized as characteristic microspeckles nor modified by small ubiquitin-like modifiers (SUMO). The absence of sumoylation of the ÎC-C mutant was due to the lack of binding to Ubc9, a SUMO conjugation enzyme. The integrity of RING finger domain was also needed for both sumoylation and microspeckle formation. In GAL4-DNA tethering assays, the ÎC-C mutant completely lost the inhibitory effect on retinoic acid (RA)-mediated transactivation. Furthermore, the expression of CD14 in U937 cells expressing the ÎC-C mutant in response to vitamin D3 was markedly higher than in cells expressing PML-RARα. However, the RA-mediated induction of C/EBPβ in cells expressing the ÎC-C mutant was comparable to that of control cells. Thus, our results suggest that the C-C domain-associated functions of sumoylation, localization as microspeckles, and the inhibition of monocyte differentiation all contribute to the oncogenic activity of PML-RARα.
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Authors
Young-Eui Kim, Dong-Yeon Kim, Jang-Mi Lee, Seong-Tae Kim, Tae-Hee Han, Jin-Hyun Ahn,