Satb1 integrates DNA binding site geometry and torsional stress to differentially target nucleosome-dense regions.


:The Satb1 genome organizer regulates multiple cellular and developmental processes. It is not yet clear how Satb1 selects different sets of targets throughout the genome. Here we have used live-cell single molecule imaging and deep sequencing to assess determinants of Satb1 binding-site selectivity. We have found that Satb1 preferentially targets nucleosome-dense regions and can directly bind consensus motifs within nucleosomes. Some genomic regions harbor multiple, regularly spaced Satb1 binding motifs (typical separation ~1 turn of the DNA helix) characterized by highly cooperative binding. The Satb1 homeodomain is dispensable for high affinity binding but is essential for specificity. Finally, we find that Satb1-DNA interactions are mechanosensitive. Increasing negative torsional stress in DNA enhances Satb1 binding and Satb1 stabilizes base unpairing regions against melting by molecular machines. The ability of Satb1 to control diverse biological programs may reflect its ability to combinatorially use multiple site selection criteria.


Nat Commun


Nature communications


Ghosh RP,Shi Q,Yang L,Reddick MP,Nikitina T,Zhurkin VB,Fordyce P,Stasevich TJ,Chang HY,Greenleaf WJ,Liphardt JT




Has Abstract


2019-07-19 00:00:00












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