Repression of PML nuclear body-associated transcription by oxidative stress-activated Bach2.
Several lines of evidence suggest that gene expression is regulated not only by the interaction between transcription factors and DNA but also by the higher-order architecture of the cell nucleus. PML bodies are one of the most prominent nuclear substructures which have been implicated in transcription regulation during apoptosis and stress responses. Bach2 is a member of the BTB-basic region leucine zipper factor family and represses transcription activity directed by the 12-O-tetradecanoylphorbol-13-acetate response element, the Maf recognition element, and the antioxidant-responsive element. Bach2 forms nuclear foci associated with PML bodies upon oxidative stress. Here, we demonstrate that transcription activity associated with PML bodies is selectively repressed by the recruitment of Bach2 around PML bodies. Fluorescence recovery after photobleaching experiments revealed that Bach2 showed rapid turnover in the nuclear foci. The Bach2 N-terminal region including the BTB domain is essential for the focus formation. Sumoylation of Bach2 is required for the recruitment of the protein around PML bodies. These observations represent the first example of modulation of transcription activity associated with PML bodies by a sequence-specific transcription factor upon oxidative stress.
Tashiro
Satoshi
S
Department of Biomedical Chemistry and Leukemia Program Project, Hiroshima University Graduate School of Biomedical Sciences, Hiroshima 734-8551, Japan. ktashiro@hiroshima-u.ac.jp
Muto
Akihiko
A
Tanimoto
Keiji
K
Tsuchiya
Haruka
H
Suzuki
Hiroshi
H
Hoshino
Hideto
H
Yoshida
Minoru
M
Walter
Joachim
J
Igarashi
Kazuhiko
K
D000818:Animals; D050976:Basic-Leucine Zipper Transcription Factors; D002460:Cell Line; D002467:Cell Nucleus / Q000378:metabolism*; D036681:Fluorescence Recovery After Photobleaching; D005786:Gene Expression Regulation; D006801:Humans; D051379:Mice; D009363:Neoplasm Proteins / Q000378:metabolism*; D009687:Nuclear Proteins; D018384:Oxidative Stress; D000071156:Promyelocytic Leukemia Protein; D017434:Protein Structure, Tertiary; D025842:SUMO-1 Protein / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D014158:Transcription, Genetic; D025521:Tumor Suppressor Proteins
C491123:BACH2 protein, human; C102109:Bach2 protein, mouse; D050976:Basic-Leucine Zipper Transcription Factors; D009363:Neoplasm Proteins; D009687:Nuclear Proteins; C513293:Pml protein, mouse; D000071156:Promyelocytic Leukemia Protein; D025842:SUMO-1 Protein; D014157:Transcription Factors; D025521:Tumor Suppressor Proteins; C070576:PML protein, human