Natural Product Biosynthesis in Actinobacteria

Actinobacteria, a phylum of Gram-positive bacteria, represent a prolific source of structurally diverse natural products with wide-ranging biological activities. These specialised metabolites, often synthesised in response to ecological cues, encompass antibiotics, anticancer agents, immunosuppressants and agrochemicals. The biosynthetic machinery responsible for their production is typically organised into discrete genomic regions known as biosynthetic gene clusters, each encoding the enzymes required for precursor assembly, tailoring and export.

Central to the chemical richness of Actinobacteria are the polyketide synthases and nonribosomal peptide synthetases that function as modular assembly lines, iteratively or consecutively extending carbon backbones and incorporating non-proteinogenic monomers. Ribosomally synthesised and post-translationally modified peptides further expand this repertoire, employing specialised enzymes to install distinct moieties and confer bioactivity. Advances in genome sequencing have revealed that many clusters remain cryptic under standard cultivation conditions, prompting the development of strategies to activate these silent pathways through co-cultivation, chemical elicitors or targeted regulatory manipulation.

Contemporary research integrates genome mining, bioinformatics and synthetic biology to predict, engineer and express novel clusters in heterologous hosts. Computational platforms now facilitate cluster detection, structure prediction and comparative analyses, guiding prioritisation of targets for experimental characterisation. Evolutionary studies of cluster architecture have uncovered patterns of domain recombination and sub-cluster fusion, offering blueprints for rational pathway engineering. Collectively, these efforts aim to unlock the vast untapped biosynthetic potential of Actinobacteria and to deliver new molecular scaffolds for medicine, agriculture and biotechnology.

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Natural Product Biosynthesis in Actinobacteria publication trend

The graph below shows the total number of articles in natural product biosynthesis in actinobacteria across all publications each year (not limited to Nature Index journals).

Technical terms

Biosynthetic gene cluster (BGC): A contiguous set of co-localized genes encoding the enzymes and regulatory elements required for the biosynthesis of a specific natural product.

Polyketide synthase (PKS): A modular enzyme complex that assembles polyketide backbones by successive condensation of acyl-CoA thioesters.

Nonribosomal peptide synthetase (NRPS): A multi-domain enzyme that assembles peptides independently of ribosomes, incorporating non-proteinogenic amino acids through an assembly-line mechanism.

Genome mining: Bioinformatic analysis of genomic sequences to identify and predict the function of biosynthetic gene clusters for specialised metabolite production.

References

1. antiSMASH 7.0: new and improved predictions for detection, regulation, chemical structures and visualisation.. Nucleic Acids Research (2023).
2. New strategies for drug discovery: activation of silent or weakly expressed microbial gene clusters. Applied Microbiology and Biotechnology (2012).
3. MIBiG 3.0: a community-driven effort to annotate experimentally validated biosynthetic gene clusters. Nucleic Acids Research (2022).
4. A Systematic Computational Analysis of Biosynthetic Gene Cluster Evolution: Lessons for Engineering Biosynthesis. PLOS Computational Biology (2014).
5. Streptomyces: The biofactory of secondary metabolites. Frontiers in Microbiology (2022).