Format

Send to

Choose Destination
Mol Cell. 2011 Jun 24;42(6):826-36. doi: 10.1016/j.molcel.2011.05.025.

Integrated approaches reveal determinants of genome-wide binding and function of the transcription factor Pho4.

Author information

1
Howard Hughes Medical Institute, Harvard University Faculty of Arts and Sciences Center for Systems Biology, Northwest Labs, 52 Oxford Street, Cambridge, MA 02138, USA.

Abstract

DNA sequences with high affinity for transcription factors occur more frequently in the genome than instances of genes bound or regulated by these factors. It is not clear what factors determine the genome-wide pattern of binding or regulation for a given transcription factor. We used an integrated approach to study how trans influences shape the binding and regulatory landscape of Pho4, a budding yeast transcription factor activated in response to phosphate limitation. We find that nucleosomes significantly restrict Pho4 binding. At nucleosome-depleted sites, competition from another transcription factor, Cbf1, determines Pho4 occupancy, raising the threshold for transcriptional activation in phosphate replete conditions and preventing Pho4 activation of genes outside the phosphate regulon during phosphate starvation. Pho4 binding is not sufficient for transcriptional activation-a cooperative interaction between Pho2 and Pho4 specifies genes that are activated. Combining these experimental observations, we are able to globally predict Pho4 binding and its functionality.

PMID:
21700227
PMCID:
PMC3127084
DOI:
10.1016/j.molcel.2011.05.025
[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Elsevier Science Icon for PubMed Central
Loading ...
Support Center