Sequence, structure, and function of the Dps DNA-binding protein from Deinococcus wulumuqiensis R12

Area of Science:

• Microbiology
• Molecular Biology
• Biochemistry

Background:

• Deinococcus wulumuqiensis R12, isolated from arid irradiated soil, belongs to a genus known for extreme radiation and oxidative stress resistance.
• The DNA-binding protein Dps is recognized for its significant role in conferring oxidative resistance in bacteria.

Purpose of the Study:

• To investigate the function of the Dps protein in Deinococcus wulumuqiensis R12.
• To analyze the Dps sequence and structure and its DNA-binding capabilities.
• To elucidate the role of Dps in oxidative stress resistance and cellular processes through gene knockout and proteomics.

Main Methods:

• Sequence analysis and homology modeling of Dps protein.
• In vitro DNA binding experiments and molecular docking.
• Gene knockout of the dps gene in D. wulumuqiensis R12.
• Proteomics analysis and quantitative real-time PCR (qRT-PCR).

Main Results:

• The Dps protein from D. wulumuqiensis R12 exhibited superior DNA binding ability compared to Dps1 from D. radiodurans R1.
• Deletion of the dps gene led to a marked decrease in resistance to hydrogen peroxide (H₂O₂) and UV radiation.
• Proteomics data revealed significant downregulation of catalase, metabolism, transport, and oxidation-reduction processes upon dps gene deletion, with cell envelope damage observed under H₂O₂ treatment.

Conclusions:

• The Dps protein plays a vital role in the oxidative stress resistance of Deinococcus wulumuqiensis R12.
• Dps is essential for maintaining cellular integrity and metabolic functions under stress conditions.
• The study highlights Dps as a key factor in the extremophilic nature of D. wulumuqiensis R12.