RT Journal Article
SR Electronic
T1 RNA Synthesis is Associated with Multiple TBP-Chromatin Binding Events
JF bioRxiv
FD Cold Spring Harbor Laboratory
SP 045161
DO 10.1101/045161
A1 Hussain A. Zaidi
A1 David T. Auble
A1 Stefan Bekiranov
YR 2016
UL http://biorxiv.org/content/early/2016/05/24/045161.abstract
AB Competition chip is an experimental method that allows transcription factor (TF) chromatin turnover dynamics to be measured across a genome. We develop and apply a physical model of TF-chromatin competitive binding using chemical reaction rate theory and derive the physical half-life or residence time for TATA-binding protein (TBP) across the yeast genome from competition ChIP data. Using our physical modeling approach where we explicitly include the induction profile of the competitor in the model, we are able to estimate yeast TBP-chromatin residence time as short as 1.3 minutes, demonstrating that competition ChIP is a relatively high temporal-resolution approach. Strikingly, we find a median value of ~5 TBP-chromatin binding events associated with the synthesis of one RNA molecule across Pol II genes, suggesting multiple rounds of pre-initiation complex assembly and disassembly before productive elongation of Pol II is achieved at most genes in the yeast genome.