Solid-state cultivation-specific agmatine production by Aspergillus oryzae: current understanding and perspectives

Area of Science:

• Biochemistry
• Microbiology
• Food Science

Background:

• Agmatine, a polyamine, offers neuroprotection and benefits gut-brain axis pathways.
• Mammalian agmatine synthesis is limited; dietary and microbial sources are crucial.
• Aspergillus oryzae produces significant agmatine during solid-state cultivation.

Purpose of the Study:

• To review agmatine production in A. oryzae under solid-state cultivation.
• To highlight the discovery and characteristics of the novel pyruvoyl-dependent ADC (Ao-ADC1).
• To challenge the notion that ascomycetes lack ADC.

Main Methods:

• Literature review of studies on A. oryzae and agmatine production.
• Focus on the identification and biochemical analysis of Ao-ADC1.
• Exploration of solid-state cultivation techniques.

Main Results:

• A novel pyruvoyl-dependent ADC, Ao-ADC1, was identified in A. oryzae.
• A. oryzae exhibits unique, high-level agmatine production under solid-state conditions.
• This discovery challenges the understanding of ADC presence in ascomycetes.

Conclusions:

• The findings provide a foundation for enhancing agmatine production in A. oryzae.
• This research paves the way for developing agmatine-enriched fermented foods and nutraceuticals.
• Understanding this pathway may illuminate microbe-host interactions and health benefits via the gut-brain axis.