7XTS

The apo structure of the engineered TfCut S130A

Summary for 7XTS

• Entry DOI: 10.2210/pdb7xts/pdb
• Descriptor: alpha/beta hydrolase, SODIUM ION (3 entities in total)
• Functional Keywords: petase, cutinase, enzyme engineering, pbat degradation, hydrolase
• Biological source: Thermobifida fusca (Thermomonospora fusca)
• Total number of polymer chains: 2
• Total formula weight: 56481.34

Authors

Yang, Y.,Jiang, P.C.,Huang, J.-W.,Chen, C.-C.,Guo, R.-T. (deposition date: 2022-05-18, release date: 2023-03-29, Last modification date: 2024-10-30)

Primary citation

Yang, Y.,Min, J.,Xue, T.,Jiang, P.,Liu, X.,Peng, R.,Huang, J.W.,Qu, Y.,Li, X.,Ma, N.,Tsai, F.C.,Dai, L.,Zhang, Q.,Liu, Y.,Chen, C.C.,Guo, R.T.
Complete bio-degradation of poly(butylene adipate-co-terephthalate) via engineered cutinases.
Nat Commun, 14:1645-1645, 2023

PubMed Abstract: Poly(butylene adipate-co-terephthalate) (PBAT), a polyester made of terephthalic acid (TPA), 1,4-butanediol, and adipic acid, is extensively utilized in plastic production and has accumulated globally as environmental waste. Biodegradation is an attractive strategy to manage PBAT, but an effective PBAT-degrading enzyme is required. Here, we demonstrate that cutinases are highly potent enzymes that can completely decompose PBAT films in 48 h. We further show that the engineered cutinases, by applying a double mutation strategy to render a more flexible substrate-binding pocket exhibit higher decomposition rates. Notably, these variants produce TPA as a major end-product, which is beneficial feature for the future recycling economy. The crystal structures of wild type and double mutation of a cutinase from Thermobifida fusca in complex with a substrate analogue are also solved, elucidating their substrate-binding modes. These structural and biochemical analyses enable us to propose the mechanism of cutinase-mediated PBAT degradation.

PubMed: 36964144
DOI: 10.1038/s41467-023-37374-3

Experimental method

X-RAY DIFFRACTION (2.21 Å)