Plastic waste management is a pressing ecological, social, and economic challenge that has looked to diverse chemical-biology strategies to facilitate biodegradation. In a new report now on Science Advances, Mercedes Spinola-Amilibia and a research team in structural and chemical biology, molecular biology, and microbial biology, in Spain, used the saliva of the lepidopteran Galleria mellonella larvae, to oxidize and depolymerize polyethylene within hours at room temperature.
Cryo–electron microscopy analysis of G. mellonella saliva. The saliva was diluted and directly applied to carbon-coated cryo-EM grids. Single-particle analysis revealed that wax worm buccal secretion is composed of three main oligomeric complexes formed by four proteins. ptcls, particles; sym, symmetry. Credit:Plastic waste management is a pressing ecological, social, and economic challenge that has looked to diverse chemical-biology strategies to facilitate biodegradation.
The team attempted to conduct initial 3D classifications of the proteins, although this was not easy due to the heterogeneity that required additional processing. Upon close inspection of the atomic model, the scientists revealed complex molecular interactions withThe outcomes emphasized the capacity for Demetra to associate with Cibeles in G. mellonella saliva to form a trimer of heterodimers.
Using 3D reconstructions, they revealed the buccal secretions to contain a mixture of four highly related proteins in different proportions and notable structural features named Demetra, Cibeles, Ceres, and Cora, of which the Demetra, Ceres, and Cora triad showed ample capacity to degrade polyethylene.
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