NADPH-generating systems in bacteria and archaea

Area of Science:

• Biochemistry
• Metabolic Engineering
• Microbiology

Background:

• Nicotinamide adenine dinucleotide phosphate (NADPH) is a vital electron donor for anabolic reactions in all organisms.
• NADPH regeneration rate limits the efficient synthesis of cellular components and biotechnological products.
• Understanding NADPH generation pathways is key for strain improvement and increased productivity.

Purpose of the Study:

• To review major canonical and non-canonical reactions for NADPH production and regeneration in prokaryotes.
• To discuss key enzymes involved in these NADPH-generating pathways.
• To provide an overview of enzyme applications for enhancing NADPH availability and productivity.

Main Methods:

• Literature review of established and emerging NADPH-generating pathways in prokaryotes.
• Analysis of key enzymes catalyzing NADPH production and regeneration.
• Compilation of examples demonstrating enzyme engineering for improved NADPH supply.

Main Results:

• Detailed description of both traditional (oxidative pentose phosphate pathway, isocitrate dehydrogenase) and alternative NADPH-generating reactions.
• Identification and discussion of critical enzymes governing NADPH turnover.
• Examples of successful enzyme applications for boosting NADPH levels and enhancing product formation.

Conclusions:

• A comprehensive understanding of diverse NADPH generation pathways is essential for metabolic engineering.
• Targeting specific enzymes in both canonical and non-canonical routes can significantly improve NADPH regeneration.
• Optimizing NADPH availability through enzymatic strategies holds great promise for advancing biotechnology and cellular biosynthesis.