Computational redesign creates an enzyme that breaks down plastic at room temperature
In short: Researchers who used a new computational strategy called GRAPE successfully engineered a more robust version of PETase, an enzyme capable of breaking down plastic. By identifying and accumulating specific beneficial mutations, the team created DuraPETase, which can degrade semicrystalline poly(ethylene terephthalate) (PET) films much faster than its natural counterpart under mild conditions.
Engineering robust proteins is often difficult because different mutations can interfere with one another. This study used a systematic clustering analysis to navigate these complex interactions and identify an efficient path of accumulated mutations to improve enzyme stability.
The researchers demonstrated that DuraPETase has a melting temperature 31 °C higher than the original enzyme and shows over a 300-fold increase in degradation speed at mild temperatures. However, while the study successfully modeled these improvements, it remains a computational redesign validated by structural analysis and specific biodegradation tests.
Why it matters: Computational modeling can help overcome the biological complexities of protein engineering to create tools for environmental cleanup.
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Sources
- Summary by Intellect · source: Research: Cui et al. (2021). Computational Redesign of a PETase for Plastic Biodegradation under Ambient Condition by the GRAPE Strategy. ACS Catalysis.
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