Abstract
Thermobifida fusca produces two cutinases which share 93% identity in amino acid sequence. In the present study, we investigated the detailed biochemical properties of T. fusca cutinases for the first time. For a better comparison between bacterial and fungal cutinases, recombinant Fusarium solani pisi cutinase was subjected to the similar analysis. The results showed that both bacterial and fungal cutinases are monomeric proteins in solution. The bacterial cutinases exhibited a broad substrate specificity against plant cutin, synthetic polyesters, insoluble triglycerides, and soluble esters. In addition, the two isoenzymes of T. fusca and the F. solani pisi cutinase are similar in substrate kinetics, the lack of interfacial activation, and metal ion requirements. However, the T. fusca cutinases showed higher stability in the presence of surfactants and organic solvents. Considering the versatile hydrolytic activity, good tolerance to surfactants, superior stability in organic solvents, and thermostability demonstrated by T. fusca cutinases, they may have promising applications in related industries.
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