Biosynthesis and Biological Control Mechanisms of Lysobacter Species

The Gram-negative genus Lysobacter comprises gliding bacteria renowned for their potent antimicrobial arsenal. Biosynthesis in these species centres on nonribosomal peptide synthases and polyketide synthases, generating secondary metabolites such as the Heat-Stable Antifungal Factor and aryl polyene pigments that function as sunscreens. A diverse array of extracellular lytic enzymes—including proteases, glucanases and chitinases—is secreted via a conserved complement of secretion systems (Types I–V and VI) and delivered also within outer membrane vesicles. These molecular weapons underlie Lysobacter’s biological control mechanisms: direct lysis of competing fungi, bacteria and nematodes; suppression of spore and cyst germination; and the elicitation of plant innate immune responses. Environmental cues finely tune this arsenal, switching between contact-dependent systems, such as the Type VI secretion apparatus, and contact-independent agents like HSAF. Genomic and transcriptomic studies have revealed the regulatory networks guiding these responses, while comparative genomics has mapped a pangenome rich in biosynthetic gene clusters. Collectively, these features position Lysobacter species as promising agents for sustainable agriculture and novel antimicrobial discovery.

Research from Nature Portfolio

Recent work has isolated four novel bacteriolytic enzymes from a Lysobacter capsici strain, including forms homologous to α- and β-lytic proteases and an N-acetylglycosaminidase. A recombinant β-lytic protease exhibited potent activity against methicillin-resistant Staphylococcus aureus at low microgram concentrations. Moreover, this study demonstrated that outer membrane vesicles form discrete subpopulations bearing enzymes responsible for antifungal activity. These findings expand the catalogue of Lysobacter’s biosynthetic outputs and underscore the dual role of vesicles in delivering both proteolytic and antifungal factors directly to target organisms.

Biosynthesis and Biological Control Mechanisms of Lysobacter Species publication trend

The graph below shows the total number of articles in biosynthesis and biological control mechanisms of lysobacter species across all publications each year (not limited to Nature Index journals).

Technical terms

Nonribosomal peptide synthase (NRPS): Enzyme complex that assembles secondary metabolites independently of ribosomes.

Polyketide synthase (PKS): Multi-domain enzyme catalysing assembly of polyketide chains that often yield bioactive compounds.

Heat-Stable Antifungal Factor (HSAF): A polyketide secondary metabolite with broad-spectrum antifungal activity.

Outer membrane vesicles (OMVs): Nano-sized lipid bilayer spheres released by Gram-negative bacteria carrying enzymes and metabolites.

Type VI secretion system (T6SS): A contact-dependent mechanism that injects effector proteins into competitor cells.

References

1. Transcriptomic Analysis Followed by the Isolation of Extracellular Bacteriolytic Proteases from Lysobacter capsici VKM B-2533T. International Journal of Molecular Sciences (2023).
2. Lysobacter enzymogenes prevents Phytophthora infection by inhibiting pathogen growth and eliciting plant immune responses. Frontiers in Plant Science (2023).
3. Characterization of Lysobacter enzymogenes B25, a potential biological control agent of plant-parasitic nematodes, and its mode of action. AIMS Microbiology (2023).
4. Comparative genomics and metabolic profiling of the genus Lysobacter. BMC Genomics (2015).
5. Biosynthetic Mechanism for Sunscreens of the Biocontrol Agent Lysobacter enzymogenes. PLOS ONE (2013).
6. Lytic potential of Lysobacter capsici VKM B-2533T: bacteriolytic enzymes and outer membrane vesicles. Scientific Reports (2020).
7. An intrinsic mechanism for coordinated production of the contact-dependent and contact-independent weapon systems in a soil bacterium. PLOS Pathogens (2020).