Journal
GENES TO CELLS
Volume 18, Issue 8, Pages 694-703Publisher
WILEY
DOI: 10.1111/gtc.12068
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Funding
- National Research Foundation of Korea [2012-0006146]
- NRF-SRC program [2012-0009213]
- Next-Generation BioGreen21 Program [PJ008002]
- KRIBB initiative program
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Setdb1 is a histone H3-lysine 9 (H3K9)-specific methyltransferase that interacts with various transcriptional regulators to induce local heterochromatin formation and participates as an indispensable component in building promyelocytic leukemia nuclear body (PML-NB), which is involved in various biological processes. We studied the effects of Setdb1 over-expression. We unexpectedly observed that exogenously expressed GFP-Setdb1 was retained in the cytoplasm, whereas endogenous Setdb1 showed a punctate nuclear signal. Leptomycin B (LMB) treatment, which blocks protein export from the nucleus, showed that entry of GFP-Setdb1 to the nucleus was regulated and that GFP-Setdb1 in the nucleus could localize at PML-NB as endogenous Setdb1. An analysis of Setdb1 deletion constructs showed that the N-terminal region was related to the nuclear export of Setdb1; supporting this, we detected two nuclear export signal motifs in this region. (SIM) whose mutation greatly reduced the ability of Setdb1 to associate with PML-NB and thus resulted in the disaggregation of PML-NB structure. We therefore presume that the cytoplasmic retention of over-expressed Setdb1 occurs as part of a regulatory mechanism to set a tight limit on the nuclear activity of Setdb1, whose excess activity might result in random and haphazard chromatin modifications that cause globally aberrant gene expression.
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