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Structures of fd gene 5 protein.nucleic acid complexes: a combined solution scattering and electron microscopy study
1Chemical Science and Technology Division Los Alamos National Laboratory, NM 87545, USA.
Journal of Molecular Biology
|June 9, 1995
Summary
Studies on fd gene 5 protein (g5p) and nucleic acid complexes reveal they form unique left-handed superhelices. The fd gene 5 protein (g5p) forms a superhelical framework with nucleic acids inside, confirmed by scattering and microscopy.
Area of Science:
- Structural biology
- Biophysics
- Molecular biology
Background:
- fd gene 5 protein (g5p) plays a crucial role in viral DNA replication.
- Understanding the structure of g5p-nucleic acid complexes is essential for elucidating DNA packaging and replication mechanisms.
Purpose of the Study:
- To test and evaluate the uniqueness of existing models for g5p-nucleic acid complexes.
- To investigate the influence of nucleotide type and protein/nucleotide ratio on complex structure.
Main Methods:
- Small-angle X-ray and neutron scattering
- Electron microscopy
- Monte Carlo integration modeling
Main Results:
- All reconstituted complexes formed similar left-handed, flexible superhelices with consistent diameters but varying pitches.
- Scattering data confirmed nucleic acids are located inside the protein superhelix.
- Previously proposed models were found to be essentially correct and unique.
Conclusions:
- fd gene 5 protein (g5p) dimers form a superhelical framework for nucleic acids.
- Nucleotide type and protein/nucleotide ratio affect superhelix pitch and mass per unit length.
- The structure of g5p-nucleic acid complexes is well-defined and unique.