Bacteria producing the bioplastic polyhydroxybutyrate kill the nematode Caenorhabditis elegans

Area of Science:

• Microbiology
• Host-microbe interactions
• Biopolymers

Background:

• Bacteria are crucial for ecosystems, influencing nutrient cycling and metabolism.
• Some bacteria produce poly-β-hydroxybutyrate (PHB), a biodegradable bioplastic, for energy storage.
• The impact of bacterial PHB production on host interactions is not well understood.

Purpose of the Study:

• To investigate the effects of PHB-producing bacteria on host organisms.
• To elucidate the mechanisms by which PHB affects host physiology and survival.

Main Methods:

• Utilized the nematode Caenorhabditis elegans as a model host.
• Examined the impact of PHB-producing bacterial strains on nematode survival and physiology.
• Investigated the role of specific host genes, such as C. elegans nuc-1 (DNAse II), in mediating host response.

Main Results:

• PHB-producing bacteria were found to be lethal to C. elegans.
• Bacterial PHB caused pharyngeal deformation, intestinal distention, barrier disruption, and defecation defects in nematodes.
• Mutations in the C. elegans nuc-1 gene partially rescued nematodes from PHB-induced lethality.

Conclusions:

• Bacterial poly-β-hydroxybutyrate production can negatively impact host physiology and survival.
• PHB contributes to virulence in bacterial-host interactions.
• Host factors, like DNAse II, play a role in the response to PHB-producing bacteria.