Plastic-eating bacteria act differently in team mode versus solo
Lim HW, Xu J, Koh J, Cao B, Tu W
Biofilm
The same biofilm behavior these bacteria use to team up on plastic is the same slime-forming strategy at work in your compost pile and around your plants' roots, where clustered microbes often break down organic matter more efficiently than solo ones.
Researchers studied a bacterium that can eat plastic bottles (PET) and found it behaves like a different organism depending on whether it's swimming alone or living in a sticky group called a biofilm on the plastic's surface. The group-living bacteria turned on special transport machinery to grab nutrients released from the breaking-down plastic, something the solo bacteria didn't do as strongly. This shows that teamwork among microbes isn't just about sticking around near food, it actually changes how they eat.
Key Findings
PET-exposed bacteria (biofilm or planktonic) share a common response: increased branched-chain amino acid transport, boosted serine production, and reduced chemotaxis (movement toward chemical signals)
Biofilm-specific cells uniquely activate tripartite tricarboxylate transporter genes from three separate genomic locations, not seen in free-floating cells
Single-cell Raman spectroscopy showed biofilm cells have a distinct membrane profile, appearing protein-rich and more saturated compared to planktonic cells
chevron_right Technical Summary
Scientists discovered that bacteria eating plastic bottles behave differently depending on whether they're floating free or stuck together in a slimy biofilm on the plastic surface, with the biofilm bacteria activating special transport systems to better capture broken-down plastic fragments.
Abstract Preview
Original paper
Amino acid reprogramming and biofilm-specific tricarboxylate transporters in PET-degrading Piscinibacter sakaiensis.
Plastic-degrading bacteria predominantly colonize polymer surfaces as biofilms, yet it remains unclear whether the biofilm phenotype contributes to metabolism beyond retaining extracellular enzymes...
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