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Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't
Solution NMR Studies of an Alternative Mode of Sin3 Engagement by the Sds3 Subunit in the Histone Deacetylase-Associated Sin3L/Rpd3L Corepressor Complex.
Journal of Molecular Biology 2015 December 5
The Sds3 transcriptional corepressor facilitates the assembly of the 1- to 2-MDa histone deacetylase-associated Sin3L/Rpd3L complex by providing a crucial homodimerization activity. Sds3 engages the scaffolding protein Sin3A, via a bipartite motif within the Sin3 interaction domain (SID) comprising a helix and an extended segment. Here, we show that the SID samples two discrete, substantially populated conformations with lifetimes in the tens of milliseconds range. The two conformations differ via a translation of the main chain and the corresponding side chains in the 5- to 7-Å range. Given the close proximity of the SID to other functional motifs in Sds3 at the sequence level, the conformational exchange has the potential to regulate these activities.
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