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Human JC virus nuclear factor 1 binding motifs and large tumor antigen region rquired for transactivation of late promoter.

Abstract：

:The nuclear factor 1 (NF-1) motifs, NF-1 II/III, In the two 98-bp repeats of the transcription-regulatory region of JC virus (JCV), have a critical role in brain-specific transcription from the JCV early promoter-enhancer. In this study, the role of these motifs in transactivation of the JCV late promoter-enhancer (JCVL) was examined in differentiating glial P19 embryonal carcinoma cells. The expression of papovaviral large tumor antigen (T-Ag) in the glial cells was shown by double immunofluorescence assays. By using site-directed mutagenesis and in vivo assays, the two wild-type NF-1 II/III sites, but not the third site, were found to be essential for the transactivation of JCVL by JCV T-Ag. In vitro transcription assays confirmed this specific transactivation and the transactivation was abolished by T-Ag antibody. In electrophoretic mobility shift assays, expression of JCV T-Ag increased the binding of a factor(s) to the 98-bp repeat. T-Ag antibody abolished the increase of binding. Binding assays with oligonucleotides of NF-1 11/111 motifs showed that the increased binding specifically required the wild-type NF-1 II/III sequences and confirmed the requirement of T-Ag. To determine the region of T-Ag necessary for transactivation Of JCVL, the coding sequences were mutated. The amino-terminal region of JCV Ag in amino acids 1-437 was essentially required for efficient transactivation. These results indicated that transactivation of JCVL and increased binding require a factor(s) found specifically in glial cells, the JCV NF-1 II/III sites, and the T-Ag amino-terminal region.

journal_name

J Neurochem

journal_title

Journal of neurochemistry

authors

Kumar KU,Devireddy LR,Tang SC,Pater A,Pater MM

doi

10.1046/j.1471-4159.1996.67020473.x

subject

Has Abstract

pub_date

1996-08-01 00:00:00

pages

473-81

issue

2

eissn

0022-3042

issn

1471-4159

journal_volume

67

pub_type

杂志文章

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