The regulation of DNA supercoiling across evolution

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• DNA supercoiling is a fundamental property influencing DNA structure and function.
• It plays critical roles in transcription, replication, recombination, and segregation.
• Understanding its regulation is key to comprehending cellular processes.

Purpose of the Study:

• To explore the evolution and regulation of DNA supercoiling across the three domains of life: bacteria, archaea, and eukaryotes.
• To highlight similarities and differences in supercoiling mechanisms and topoisomerase functions.
• To identify therapeutic potentials related to DNA supercoiling regulation.

Main Methods:

• Comparative analysis of DNA supercoiling mechanisms and topoisomerase functions across different life domains.
• Review of regulatory factors including proteins, metabolites, and physicochemical conditions.
• Examination of evolutionary conservation and divergence in supercoiling regulation.

Main Results:

• All organisms exhibit local, constrained supercoiling; only bacteria and archaea show global, unconstrained supercoiling.
• Topoisomerases that dissipate supercoils are universal, but those introducing supercoils are specific to bacteria and archaea.
• Regulation of topoisomerase abundance and activity is domain-specific.

Conclusions:

• DNA supercoiling regulation exhibits conserved principles and kingdom-specific variations.
• Targeting bacteria-specific supercoiling mechanisms offers therapeutic potential for novel bactericidal agents.
• Understanding eukaryotic topoisomerases involved in DNA replication is crucial for anticancer drug development.