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Single-molecule study of the CUG repeat-MBNL1 interaction and its inhibition by small molecules.

ABSTRACT: Effective drug discovery and optimization can be accelerated by techniques capable of deconvoluting the complexities often present in targeted biological systems. We report a single-molecule approach to study the binding of an alternative splicing regulator, muscleblind-like 1 protein (MBNL1), to (CUG)n = 4,6 and the effect of small molecules on this interaction. Expanded CUG repeats (CUG(exp)) are the causative agent of myotonic dystrophy type 1 by sequestering MBNL1. MBNL1 is able to bind to the (CUG)n-inhibitor complex, indicating that the inhibition is not a straightforward competitive process. A simple ligand, highly selective for CUG(exp), was used to design a new dimeric ligand that binds to (CUG)n almost 50-fold more tightly and is more effective in destabilizing MBNL1-(CUG)4. The single-molecule method and the analysis framework might be extended to the study of other biomolecular interactions.

SUBMITTER: Haghighat Jahromi A

PROVIDER: S-EPMC3711446 | biostudies-literature | 2013 Jul

REPOSITORIES: biostudies-literature

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Single-molecule study of the CUG repeat-MBNL1 interaction and its inhibition by small molecules.

Haghighat Jahromi Amin A Honda Masayoshi M Zimmerman Steven C SC Spies Maria M

Nucleic acids research 20130509 13

Effective drug discovery and optimization can be accelerated by techniques capable of deconvoluting the complexities often present in targeted biological systems. We report a single-molecule approach to study the binding of an alternative splicing regulator, muscleblind-like 1 protein (MBNL1), to (CUG)n = 4,6 and the effect of small molecules on this interaction. Expanded CUG repeats (CUG(exp)) are the causative agent of myotonic dystrophy type 1 by sequestering MBNL1. MBNL1 is able to bind to t ...[more]

PMID: 23661680

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