Antireduction: an ancient strategy fit for future.

Area of Science:

• Biochemistry
• Origin of Life Studies
• Environmental Science

Background:

• Antioxidants are well-known, but antireductants, their chemical opposites, are less understood.
• Antireductants function by preventing the reduction of other compounds through self-reduction.
• These compounds played a crucial role in early Earth's geochemistry and the emergence of life.

Purpose of the Study:

• To define and explore the multifaceted roles of antireductants.
• To highlight their historical significance in early metabolic pathways and atmospheric changes.
• To discuss their dual functions as electron acceptors and antioxidants.

Main Methods:

• Literature review and conceptual analysis of chemical reduction and oxidation processes.
• Examination of historical and biochemical evidence for antireductant activity.
• Identification of natural compounds exhibiting antireductant properties.

Main Results:

• Antireductants were essential for early lithoautotrophic microbial growth by accepting electrons and removing atmospheric dihydrogen (H2).
• Certain antireductants exhibit a dual role, acting as both electron acceptors and antioxidants, particularly in plant secondary metabolites.
• Examples include carotenoids (antiradicals), fumarate, catechin, and resveratrol (methane emission reduction), and triplet oxygen (O2) for protection.

Conclusions:

• Antireductants have a deep evolutionary history, influencing the origin and early development of life.
• Their dual functionality as electron acceptors and antioxidants is present in various natural compounds.
• Potential applications span health, industrial processes, and environmental solutions, underscoring their broad significance.