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Discovery of new bioactive molecules for use in crop protection
Secondary Supervisor(s): Dr Lijiang Song (Chemistry)
University of Registration: University of Warwick
BBSRC Research Themes:
Project Outline
General background
Many of the bioactive molecules used in agriculture are made by microorganisms or inspired by natural products. For instance, abamectin derives from actinomycete bacteria and is one of the most widely used insecticides in crop protection. The Alberti lab aims to discover new bioactive natural products using a combination of genomics, genetic engineering and analytical chemistry, with the aim to improve the repertoire of molecules available for crop protection.1–3
Project background
We previously isolated and characterised fungal strains of the genus Trichoderma that show inhibition of the growth of plant pathogenic bacteria.4 We have identified candidate biosynthetic gene clusters within their genomes that we believe to be involved in the biosynthesis of novel bioactive molecules.
Aim and Objectives
Aim: to discover and characterise antimicrobial natural products from fungi that can be used in crop protection to fight plant diseases.
Objectives:
- To clone and heterologously express the biosynthetic gene clusters of interest (Fig. 1A);
- To isolate and characterise the corresponding natural products, including polyketides and non-ribosomal peptides (Fig. 1B);
- To assess the bioactivity of the isolated compounds against a panel of plant pathogenic bacteria, including on plants, and to evaluate their cytotoxicity on human cells (Fig. 1C).
Methodology
- Gene cloning, such as Golden Gate assembly, Gibson assembly and yeast-based homologous recombination will be used to clone the genes of interest and assemble them into suitable expression vectors for heterologous expression in Aspergillus oryzae;
- Metabolite analyses will be performed through LC-MS and NMR spectroscopy (previous experience in these techniques is not essential) in order to characterise the pathway products and define the catalytic function of the relevant enzymes;
- Antimicrobial bioassays will be performed against a panel of plant pathogenic bacteria, including on plants, to assess the bioactivity of the isolated compounds;
- Genetic engineering will be performed (e.g. through CRISPR/Cas9) with the aim to study and improve the production of the molecules of interest.
Impact
This PhD project will lead to the development of biological control agents for plant disease, and will have long term impact on agricultural practices.
References
(1) Al-salihi, S. A. A.; Alberti, F. Genomic Based Analysis of the Biocontrol Species Trichoderma Harzianum: A Model Resource of Structurally Diverse Pharmaceuticals and Biopesticides. Journal of Fungi 2023, 9, 895.
(2) Brooks, S.; Weaver, J. A.; Klomchit, A.; Alharthi, S. A.; Onlamun, T.; Nurani, R.; Vong, T. K.; Alberti, F.; Greco, C. Unveiling the Potential of Daldinia Eschscholtzii MFLUCC 19-0629 through Bioactivity and Bioinformatics Studies for Enhanced Sustainable Agriculture Production. Frontiers in Chemical Biology 2024, 3, 1362147. https://doi.org/10.3389/fchbi.2024.1362147.
(3) Klomchit, A.; Calabon, M. S.; Worabandit, S.; Weaver, J. A.; Karima, E. M.; Alberti, F.; Greco, C.; Mahanil, S. Unveiling Novel Neocosmospora Species from Thai Mangroves as Potent Biocontrol Agents against Colletotrichum Species. J Appl Microbiol 2024, 135 (5), lxae114. https://doi.org/10.1093/jambio/lxae114.
(4) Tamizi, A.; Mat-amin, N.; Weaver, J. A.; Olumakaiye, R. T.; Akbar, M. A.; Jin, S.; Bunawan, H.; Alberti, F. Genome Sequencing and Analysis of Trichoderma (Hypocreaceae) Isolates Exhibiting Antagonistic Activity against the Papaya Dieback Pathogen, Erwinia Mallotivora. Journal of fungi 2022, 8, 246. https://doi.org/https://doi.org/10.3390/jof8030246.