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- W2955363253 abstract "Carboxylases are biocatalysts that capture and convert carbon dioxide (CO 2 ) under mild conditions and atmospheric concentrations at a scale of more than 400 Gt annually. However, how these enzymes bind and control the gaseous CO 2 molecule during catalysis is only poorly understood. One of the most efficient classes of carboxylating enzymes are enoyl-CoA carboxylases/reductases (Ecrs), which outcompete the plant enzyme RuBisCO in catalytic efficiency and fidelity by more than an order of magnitude. Here we investigated the interactions of CO 2 within the active site of Ecr from Kitasatospora setae . Combining experimental biochemistry, protein crystallography, and advanced computer simulations we show that 4 amino acids, N81, F170, E171, and H365, are required to create a highly efficient CO 2 -fixing enzyme. Together, these 4 residues anchor and position the CO 2 molecule for the attack by a reactive enolate created during the catalytic cycle. Notably, a highly ordered water molecule plays an important role in an active site that is otherwise carefully shielded from water, which is detrimental to CO 2 fixation. Altogether, our study reveals unprecedented molecular details of selective CO 2 binding and C–C-bond formation during the catalytic cycle of nature’s most efficient CO 2 -fixing enzyme. This knowledge provides the basis for the future development of catalytic frameworks for the capture and conversion of CO 2 in biology and chemistry." @default.
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- W2955363253 date "2019-06-26" @default.
- W2955363253 modified "2023-10-16" @default.
- W2955363253 title "Four amino acids define the CO <sub>2</sub> binding pocket of enoyl-CoA carboxylases/reductases" @default.
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- W2955363253 doi "https://doi.org/10.1073/pnas.1901471116" @default.
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