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Polyglutamine tract binding protein-1 is an intrinsically unstructured protein
Masaki Takahashi1, Mineyuki Mizuguchi, Hiroyuki Shinoda
1Faculty of Pharmaceutical Sciences, University of Toyama, 2630, Sugitani, Toyama 930-0194, Japan.
Biochimica Et Biophysica Acta
|March 24, 2009
Summary
Polyglutamine tract binding protein-1 (PQBP-1) is a nuclear protein with intrinsically disordered regions. Binding to U5-15kD causes minimal structural changes, indicating PQBP-1 remains largely unstructured.
Area of Science:
- Molecular Biology
- Protein Structure and Dynamics
Background:
- Polyglutamine tract binding protein-1 (PQBP-1) is a nuclear protein involved in binding expanded polyglutamine repeats.
- PQBP-1 interacts with RNA polymerase II and spliceosomal components like U5-15kD.
Purpose of the Study:
- To elucidate the structural characteristics of PQBP-1.
- To investigate the conformational changes in PQBP-1 upon binding to U5-15kD.
Main Methods:
- Structural analysis of PQBP-1.
- Investigation of protein-protein interactions and conformational dynamics.
Main Results:
- PQBP-1 comprises a large unstructured region and a small folded core.
- The unstructured region contains polar amino acid-rich and C-terminal domains.
- Binding of U5-15kD induces only minor conformational changes in PQBP-1.
Conclusions:
- PQBP-1 exhibits characteristics of intrinsically unstructured/disordered proteins.
- The C-terminal domain of PQBP-1 remains largely unstructured even after U5-15kD binding.
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