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Molecular Cell
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Molecular Cell
Article . 2007
License: Elsevier Non-Commercial
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Molecular Cell
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Molecular Cell
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A Transcription-Independent Role for TFIIB in Gene Looping

Authors: Michael Hampsey; Badri Nath Singh;

A Transcription-Independent Role for TFIIB in Gene Looping

Abstract

Recent studies demonstrated the existence of gene loops that juxtapose the promoter and terminator regions of genes with exceptionally long ORFs in yeast. Here we report that looping is not idiosyncratic to long genes but occurs between the distal ends of genes with ORFs as short as 1 kb. Moreover, looping is dependent upon the general transcription factor TFIIB: the E62K (glutamic acid 62 --> lysine) form of TFIIB adversely affects looping at every gene tested, including BLM10, SAC3, GAL10, SEN1, and HEM3. TFIIB crosslinks to both the promoter and terminator regions of the PMA1 and BLM10 genes, and its association with the terminator, but not the promoter, is adversely affected by E62K and by depletion of the Ssu72 component of the CPF 3' end processing complex, and is independent of TBP. We propose a model suggesting that TFIIB binds RNAP II at the terminator, which in turn associates with the promoter scaffold.

Related Organizations
Keywords

Terminator Regions, Genetic, Chromatin Immunoprecipitation, Saccharomyces cerevisiae Proteins, Models, Genetic, Transcription, Genetic, Cell Biology, Open Reading Frames, Gene Expression Regulation, Fungal, Transcription Factor TFIIB, Nucleic Acid Conformation, RNA Polymerase II, Promoter Regions, Genetic, Molecular Biology

  • BIP!
    Impact byBIP!
    citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    160
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Top 10%
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 1%
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
160
Top 10%
Top 10%
Top 1%
hybrid