Transcriptional interference between the EBV transcription factors EB1 and R: both DNA-binding and activation domains of EB1 are required.

The switch from latency to a productive infection in EBV-infected B cells is linked to the expression of two viral sequence-specific DNA-binding transcription factors called EB1 and R. EB1 shares sequence homologies with the bZIP family of proteins in the basic region required for specific DNA inter...

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প্রধান লেখক: Giot, J F, Mikaelian, I, Buisson, M, Manet, E, Joab, I, Nicolas, J C, Sergeant, A
বিন্যাস: প্রবন্ধ
ভাষা:en
প্রকাশিত: 1991
অনলাইন ব্যবহার করুন:https://ncbi.nlm.nih.gov/pmc/articles/PMC333850/
https://ncbi.nlm.nih.gov/pubmed/1851554
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spelling pubmed-3338502004-02-10 Transcriptional interference between the EBV transcription factors EB1 and R: both DNA-binding and activation domains of EB1 are required. Giot, J F Mikaelian, I Buisson, M Manet, E Joab, I Nicolas, J C Sergeant, A Nucleic Acids Res The switch from latency to a productive infection in EBV-infected B cells is linked to the expression of two viral sequence-specific DNA-binding transcription factors called EB1 and R. EB1 shares sequence homologies with the bZIP family of proteins in the basic region required for specific DNA interaction. Here, we provide evidence that EB1 and R can synergistically activate specific transcription, and that overexpressed, unbound EB1, represses the R-induced transcription ('squelching'). In order to identify the EB1 domains involved in transcriptional activation, transcriptional synergy and transcriptional repression, we performed extensive mutagenesis of the EB1 protein. Results show that five segments (region 1 to region 5), localized at the N-terminus of EB1 exhibit characteristics of activating domains, since they are required for full transcriptional activity, without obvious role in DNA-binding, or the nuclear localization. Two domains rich in basic amino-acids are required for the nuclear localization of EB1. One domain is within the basic region B, also necessary for specific and stable interaction between EB1 and its cognate DNA sequences. It is also shown that the 'activation' domain, and more surprisingly the DNA-binding domain of EB1, may interact with a factor(s), essential for R-induced activation, and probably required for synergy between EB1 and R. 1991-03-25 /pmc/articles/PMC333850/ /pubmed/1851554 Text en
institution US National Library of Medicine
collection PubMed Central
language en
format Article
description The switch from latency to a productive infection in EBV-infected B cells is linked to the expression of two viral sequence-specific DNA-binding transcription factors called EB1 and R. EB1 shares sequence homologies with the bZIP family of proteins in the basic region required for specific DNA interaction. Here, we provide evidence that EB1 and R can synergistically activate specific transcription, and that overexpressed, unbound EB1, represses the R-induced transcription ('squelching'). In order to identify the EB1 domains involved in transcriptional activation, transcriptional synergy and transcriptional repression, we performed extensive mutagenesis of the EB1 protein. Results show that five segments (region 1 to region 5), localized at the N-terminus of EB1 exhibit characteristics of activating domains, since they are required for full transcriptional activity, without obvious role in DNA-binding, or the nuclear localization. Two domains rich in basic amino-acids are required for the nuclear localization of EB1. One domain is within the basic region B, also necessary for specific and stable interaction between EB1 and its cognate DNA sequences. It is also shown that the 'activation' domain, and more surprisingly the DNA-binding domain of EB1, may interact with a factor(s), essential for R-induced activation, and probably required for synergy between EB1 and R.
author Giot, J F
Mikaelian, I
Buisson, M
Manet, E
Joab, I
Nicolas, J C
Sergeant, A
spellingShingle Giot, J F
Mikaelian, I
Buisson, M
Manet, E
Joab, I
Nicolas, J C
Sergeant, A
Transcriptional interference between the EBV transcription factors EB1 and R: both DNA-binding and activation domains of EB1 are required.
author_facet Giot, J F
Mikaelian, I
Buisson, M
Manet, E
Joab, I
Nicolas, J C
Sergeant, A
author_sort Giot, J F
title Transcriptional interference between the EBV transcription factors EB1 and R: both DNA-binding and activation domains of EB1 are required.
title_short Transcriptional interference between the EBV transcription factors EB1 and R: both DNA-binding and activation domains of EB1 are required.
title_full Transcriptional interference between the EBV transcription factors EB1 and R: both DNA-binding and activation domains of EB1 are required.
title_fullStr Transcriptional interference between the EBV transcription factors EB1 and R: both DNA-binding and activation domains of EB1 are required.
title_full_unstemmed Transcriptional interference between the EBV transcription factors EB1 and R: both DNA-binding and activation domains of EB1 are required.
title_sort transcriptional interference between the ebv transcription factors eb1 and r: both dna-binding and activation domains of eb1 are required.
publishDate 1991
url https://ncbi.nlm.nih.gov/pmc/articles/PMC333850/
https://ncbi.nlm.nih.gov/pubmed/1851554
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