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Nucleic Acids Res. 2015 Sep 3;43(15):7535-43. doi: 10.1093/nar/gkv679. Epub 2015 Jul 6.

Nucleic acid-binding specificity of human FUS protein.

Author information

1
Howard Hughes Medical Institute, Department of Chemistry and Biochemistry, BioFrontiers Institute, University of Colorado, Boulder CO 80309, USA.
2
Howard Hughes Medical Institute, Department of Chemistry and Biochemistry, BioFrontiers Institute, University of Colorado, Boulder CO 80309, USA Thomas.Cech@colorado.edu.

Abstract

FUS, a nuclear RNA-binding protein, plays multiple roles in RNA processing. Five specific FUS-binding RNA sequence/structure motifs have been proposed, but their affinities for FUS have not been directly compared. Here we find that human FUS binds all these sequences with Kd (app) values spanning a 10-fold range. Furthermore, some RNAs that do not contain any of these motifs bind FUS with similar affinity. FUS binds RNA in a length-dependent manner, consistent with a substantial non-specific component to binding. Finally, investigation of FUS binding to different nucleic acids shows that it binds single-stranded DNA with three-fold lower affinity than ssRNA of the same length and sequence, while binding to double-stranded nucleic acids is weaker. We conclude that FUS has quite general nucleic acid-binding activity, with the various proposed RNA motifs being neither necessary for FUS binding nor sufficient to explain its diverse binding partners.

PMID:
26150427
PMCID:
PMC4551922
DOI:
10.1093/nar/gkv679
[Indexed for MEDLINE]
Free PMC Article

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