Nuclear DNA helicase II is recruited to IFN-α-activated transcription sites at PML nuclear bodies

被引:51
作者
Fuchsová, B
Novák, P
Kafková, J
Hozák, P
机构
[1] Acad Sci Czech Republ, Inst Expt Med, Dept Cell Ultrastruct & Mol Biol, Prague 14220 4, Czech Republic
[2] Acad Sci Czech Republ, Inst Microbiol, Mass Spectrometry Lab, Prague 14220 4, Czech Republic
[3] Inst Rheumatol, Dept Immunol, Prague 12850 2, Czech Republic
[4] Charles Univ, Fac Med 3, Dept Cell & Mol Biol, Prague 10034 2, Czech Republic
关键词
interferon; nuclear DNA helicase II; PML nuclear body; RNA helicase A; RNA polymerase II;
D O I
10.1083/jcb.200202035
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
It is known that the nuclear DNA helicase II (NDH II) links CREB-binding protein directly to RNA polymerase II holoenzyme, and that this interaction is essential for gene activation by CREB. Here, we report for the first time that some NDH II/RNA helicase A is a component of promyelocytic leukemia nuclear bodies (PML NBs). An autoimmune serum specific for PML NBs was identified and used in immunoprecipitation experiments. NDH II was present in the immunoprecipitates as shown by mass spectrometry and by immunoblotting. Immunofluorescence and ultrastructural studies showed that NDH II colocalizes with a small subset of PML NBs in control cells, however, colocalizes with practically all bodies in interferon-alpha-stimulated cells. After interferon stimulation, more PML NBs were found to contain newly synthesized RNA, as indicated by bromouridine incorporation. PML NBs also contain RNA polymerase II. The association of NDH II with PML NBs was transcriptionally dependent, and NDH II was present in all bodies with nascent RNA. Blocking of mRNA synthesis caused NDH II relocalization from nucleoplasm to nucleoli. Based on the data, we suggest that NDH II recruitment to PML NBs is connected with transcriptional regulation of interferon-a-inducible genes attached to PML NBs.
引用
收藏
页码:463 / 473
页数:11
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