An intrinsically disordered transcription activation domain increases the DNA binding affinity and reduces the specificity of NFκB p50/RelA

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dc.citation.articleNumber102349
dc.citation.issueNumber9
dc.citation.journalTitleJournal of Biological Chemistry
dc.citation.volumeNumber298
dc.contributor.authorBaughman, Hannah E.R.
dc.contributor.authorNarang, Dominic
dc.contributor.authorChen, Wei
dc.contributor.authorVillagrán Suárez, Amalia C.
dc.contributor.authorLee, Joan
dc.contributor.authorBachochin, Maxwell J.
dc.contributor.authorGunther, Tristan R.
dc.contributor.authorWolynes, Peter G.
dc.contributor.authorKomives, Elizabeth A.
dc.contributor.orgCenter for Theoretical Biological Physics
dc.date.accessioned2022-09-08T14:39:54Z
dc.date.available2022-09-08T14:39:54Z
dc.date.issued2022
dc.description.abstractMany transcription factors contain intrinsically disordered transcription activation domains (TADs), which mediate interactions with coactivators to activate transcription. Historically, DNA-binding domains and TADs have been considered as modular units, but recent studies have shown that TADs can influence DNA binding. Whether these results can be generalized to more TADs is not clear. Here, we biophysically characterized the NFκB p50/RelA heterodimer including the RelA TAD and investigated the TAD’s influence on NFκB–DNA interactions. In solution, we show the RelA TAD is disordered but compact, with helical tendency in two regions that interact with coactivators. We determined that the presence of the TAD increased the stoichiometry of NFκB–DNA complexes containing promoter DNA sequences with tandem κB recognition motifs by promoting the binding of NFκB dimers in excess of the number of κB sites. In addition, we measured the binding affinity of p50/RelA for DNA containing tandem κB sites and single κB sites. While the presence of the TAD enhanced the binding affinity of p50/RelA for all κB sequences tested, it also increased the affinity for nonspecific DNA sequences by over 10-fold, leading to an overall decrease in specificity for κB DNA sequences. In contrast, previous studies have generally reported that TADs decrease DNA-binding affinity and increase sequence specificity. Our results reveal a novel function of the RelA TAD in promoting binding to nonconsensus DNA, which sheds light on previous observations of extensive nonconsensus DNA binding by NFκB in vivo in response to strong inflammatory signals.
dc.identifier.citationBaughman, Hannah E.R., Narang, Dominic, Chen, Wei, et al.. "An intrinsically disordered transcription activation domain increases the DNA binding affinity and reduces the specificity of NFκB p50/RelA." <i>Journal of Biological Chemistry,</i> 298, no. 9 (2022) Elsevier: https://doi.org/10.1016/j.jbc.2022.102349.
dc.identifier.digital1-s2-0-S002192582200792X-main
dc.identifier.doihttps://doi.org/10.1016/j.jbc.2022.102349
dc.identifier.urihttps://hdl.handle.net/1911/113184
dc.language.isoeng
dc.publisherElsevier
dc.rightsThis is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/).
dc.titleAn intrinsically disordered transcription activation domain increases the DNA binding affinity and reduces the specificity of NFκB p50/RelA
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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