Biosynthesis of Neuroactive Alkaloids from Endophytic Fungi

Endophytic fungi, which live symbiotically within plant tissues without causing disease, have emerged as versatile factories for the production of neuroactive alkaloids. These nitrogen-containing natural products often mimic or modulate neurotransmitter function and have found application in treating neurodegenerative disorders. Biosynthesis begins with primary metabolites such as amino acids, which are channelled through a series of enzyme-catalysed steps—including decarboxylation, oxidative coupling and scaffold rearrangement—to yield complex alkaloid structures. Key enzymatic classes include copper amine oxidases, cytochrome P450 monooxygenases and specialised transferases. Advances in combined transcriptomic and metabolomic profiling have revealed transcription factors and gene clusters that coordinate these pathways in fungal hosts. Harnessing endophytes offers sustainable supply chains, alleviating pressure on slow-growing medicinal plants and enabling scalable fermentation. Integration of genome mining, pathway engineering and bioreactor optimisation promises to accelerate discovery of novel compounds and improve yields of established neuroactives such as huperzines and terrequinones.

Research from Nature Portfolio

Foundational work has identified a Penicillium strain isolated from a traditional clubmoss as a robust producer of a potent acetylcholinesterase inhibitor, achieving yields comparable to plant extraction. Detailed morphological and molecular analyses established the fungal identity and confirmed alkaloid biosynthesis under defined culture conditions. This study set a benchmark for endophyte-based production of therapeutic neuroactives and stimulated subsequent efforts to elucidate fungal biosynthetic genes and optimise fermentation parameters.

Biosynthesis of Neuroactive Alkaloids from Endophytic Fungi publication trend

The graph below shows the total number of articles in biosynthesis of neuroactive alkaloids from endophytic fungi across all publications each year (not limited to Nature Index journals).

Technical terms

Endophytic fungi: Microorganisms that inhabit plant tissues asymptomatically, often producing host-derived metabolites.

Neuroactive alkaloids: Nitrogen-containing natural products that interact with nervous system targets such as enzymes and receptors.

Huperzine A: A lycodine-type alkaloid that potently inhibits acetylcholinesterase, used in clinical trials for Alzheimer’s disease.

Acetylcholinesterase (AChE): An enzyme that hydrolyses the neurotransmitter acetylcholine, termination signal in cholinergic synapses.

Biosynthetic pathway: A linked series of enzymatic reactions converting simple precursors into complex secondary metabolites.

Metabolomics: The large-scale study of small molecules (metabolites) within cells or organisms, providing a snapshot of biochemical activity.

References

1. Isolation of endophytic fungi and screening of Huperzine A–producing fungus from Huperzia serrata in Vietnam. Scientific Reports (2019).
2. Cholinesterase Inhibitors from an Endophytic Fungus Aspergillus niveus Fv-er401: Metabolomics, Isolation and Molecular Docking. Molecules (2023).
3. Isolation and Characterization of Novel Huperzine-Producing Endophytic Fungi from Lycopodiaceae Species. Journal of Fungi (2023).
4. Endophytic Fungal Community of Huperzia serrata: Diversity and Relevance to the Production of Huperzine A by the Plant Host. Molecules (2021).