Novel structural and functional mode of a knot essential for RNA binding activity of the Esa1 presumed chromodomain

Journal of Molecular Biology
Hideaki ShimojoYoshifumi Nishimura

Abstract

Chromodomains are methylated histone binding modules that have been widely studied. Interestingly, some chromodomains are reported to bind to RNA and/or DNA, although the molecular basis of their RNA/DNA interactions has not been solved. Here we propose a novel binding mode for chromodomain-RNA interactions. Essential Sas-related acetyltransferase 1 (Esa1) contains a presumed chromodomain in addition to a histone acetyltransferase domain. We initially determined the solution structure of the Esa1 presumed chromodomain and showed it to consist of a well-folded structure containing a five-stranded beta-barrel similar to the tudor domain rather than the canonical chromodomain. Furthermore, the domain showed no RNA/DNA binding ability. Because the N-terminus of the protein forms a helical turn, we prepared an N-terminally extended construct, which we surprisingly found to bind to poly(U) and to be critical for in vivo function. This extended protein contains an additional beta-sheet that acts as a knot for the tudor domain and binds to oligo(U) and oligo(C) with greater affinity compared with other oligo-RNAs and DNAs examined thus far. The knot does not cause a global change in the core structure but induces a well-defined loop in...Continue Reading

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Oct 6, 2009·Chromosome Research : an International Journal on the Molecular, Supramolecular and Evolutionary Aspects of Chromosome Biology·Erinc Hallacli, Asifa Akhtar
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