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Publication Abstract from PubMed

Topoisomerase IIIbeta (TOP3beta) is a DNA/RNA topoisomerase that has been implicated in epigenetic or translational control of gene expression. In cells, TOP3beta co-exists with its specific auxiliary factor, TDRD3. TDRD3 serves as a scaffold protein to recruit TOP3beta to its DNA/RNA substrates accumulating in specific cellular sites such as methylated chromatins or neural stress granules. Here we report the crystal structures of the catalytic domain of TOP3beta, the DUF1767-OB-fold domains of TDRD3 and their complex at 3.44 A, 1.62 A and 3.6 A resolutions, respectively. The toroidal-shaped catalytic domain of TOP3beta binds the OB-fold domain of TDRD3. The TDRD3 OB-fold domain harbors the insertion loop, which is protruding from the core structure. Both the insertion loop and core region interact with TOP3beta. Our pull-down binding assays showed that hydrophobic characters of the core surface and the amino- and carboxy-terminal regions of the insertion loop are essential for the interaction. Furthermore, by comparison with the structure of the homologous Topoisomerase IIIalpha (TOP3alpha)-RMI1 complex, we identified Arg96, Val109, Phe139 and the short insertion loop of TDRD3 as the critical structural elements for the specific interaction with TOP3beta to avoid the non-cognate interaction with TOP3alpha.

Structural basis of the interaction between Topoisomerase IIIbeta and the TDRD3 auxiliary factor.,Goto-Ito S, Yamagata A, Takahashi TS, Sato Y, Fukai S Sci Rep. 2017 Feb 8;7:42123. doi: 10.1038/srep42123. PMID:28176834^[4]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.