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1 H, 15 N and 13 C backbone assignment of apo TDP-43 RNA recognition motifs.
Biomolecular NMR Assignments 2019 January 30
TAR DNA-binding protein 43 (TDP-43) is a ubiquitously expressed nuclear protein that influences diverse cellular processes by regulating alternative splicing of RNA and microRNA biogenesis. It is also a pathological protein found in sporadic ALS and in the most common subtype of frontotemporal lobar degeneration with ubiquitinated inclusions (FLTD-U). TDP-43 has two tandem RNA-binding domains, RRM1 and RRM2. The NMR structure of TDP-43 was solved in the presence of UG-rich RNA sequences bound to the RRM1 and RRM2 domains. Here we report the backbone assignment of apo TDP-43. The chemical shift (HN, N, C, Cα and Cβ ) analysis shows the predicted regions of secondary structure are in good agreement with those observed for TDP-43 in complex with RNA. However, our data show that the apo structure of TPD-43 has increased flexibility in the regions that would normally have been used to anchor the RNA bases. The backbone chemical shifts assignments will prove useful in the study of TDP-43 interaction with non-canonical RNA and RRM-binding proteins.
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