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Topology of recombinant rat upstream binding factor.
R A Ridsdale1, J L Semotok, D E Larson
1Department of Molecular Biology and Genetics, University of Guelph, ON, Canada.
Summary
Structural analysis revealed rat upstream binding factor (UBF) is a dimer, approximately 10 nm wide, with distinct nodes likely representing HMG boxes 3 and 4. The dimerization domain is likely internal.
Area of Science:
- Structural biology
- Molecular biology
- Biochemistry
Background:
- Rat upstream binding factor (UBF) is crucial for ribosomal DNA transcription.
- Understanding UBF's structure is key to elucidating its regulatory mechanisms.
Purpose of the Study:
- To determine the high-resolution structure of a recombinant, acidic tail-deficient UBF.
- To identify the location of functional domains within the UBF structure.
Main Methods:
- Transmission electron microscopy (TEM) for imaging.
- Single particle electron crystallography for structural reconstruction.
Main Results:
- High-quality projection images of UBF were obtained.
- UBF was confirmed to be a dimer, approximately 10 nm in diameter.
- A central low-density region and distinct nodes, consistent with HMG boxes 3 and 4, were observed.
- The dimerization domain is likely located in the internal region of the UBF structure.
Conclusions:
- The study provides novel structural insights into UBF.
- The findings suggest a model for UBF dimerization and domain organization.
- This structural information can inform future studies on transcription regulation.