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Novel thermostable single-stranded DNA-binding protein (SSB) from Deinococcus geothermalis.
Paweł Filipkowski1, Anna Duraj-Thatte, Józef Kur
1Department of Microbiology, Gdańsk University of Technology, ul. Narutowicza 11/12, 80952 Gdańsk, Poland.
Archives of Microbiology
|June 28, 2006
Summary
The Deinococcus geothermalis single-stranded DNA-binding (SSB) protein, DgeSSB, was characterized and found to be thermostable. DgeSSB functions similarly to other SSB proteins and can substitute for E. coli SSB in vivo, making it a potential alternative for molecular biology applications.
Area of Science:
- Biochemistry
- Molecular Biology
- Extremophile Research
Background:
- Single-stranded DNA-binding (SSB) proteins are crucial for DNA replication, repair, and recombination.
- Thermostable SSBs are valuable tools in molecular biology techniques requiring high temperatures.
- Deinococcus species are known for their radiation resistance and thermostability.
Purpose of the Study:
- To characterize the biochemical properties of the SSB protein from Deinococcus geothermalis (DgeSSB).
- To evaluate DgeSSB's potential as an alternative to existing thermostable SSBs in molecular biology applications.
Main Methods:
- Cloning and overexpression of the DgeSSB gene.
- Biochemical characterization including DNA binding assays (fluorescence titration).
- In vivo complementation assay in Escherichia coli.
- Thermostability assessment.
Main Results:
- DgeSSB is a homodimeric protein with two oligonucleotide/oligosaccharide-binding folds per monomer.
- DgeSSB binds approximately 30 nucleotides of poly(dT) with significant fluorescence quenching.
- DgeSSB successfully complemented the essential function of E. coli SSB in vivo.
- DgeSSB exhibits significant thermostability, with half-lives of 50 min at 70°C and 5 min at 90°C.
Conclusions:
- DgeSSB shares biochemical properties with other Thermus/Deinococcus SSBs.
- DgeSSB is a functional and thermostable protein with potential applications in molecular biology.
- DgeSSB presents an attractive alternative to TaqSSB and TthSSB for various applications.