Directed evolution of an ultrastable carbonic anhydrase for highly efficient carbon capture from flue gas
- Codexis, Inc., Redwood City, CA (United States)
- Calysta Energy, Inc., Menlo Park, CA (United States)
- Siluria Technologies Inc., San Francisco, CA (United Sates)
- Pioneer Hi-Bred International, Inc., Johnston, IA (United States)
- Novosymes Inc, Franklinton, NC (United States)
- BP Biofuels, San Diego, CA (United States)
Carbonic anhydrase (CA) is one of nature’s fastest enzymes and can dramatically improve the economics of carbon capture under demanding environments such as coal-fired power plants. The use of CA to accelerate carbon capture is limited by the enzyme’s sensitivity to the harsh process conditions. Using directed evolution, the properties of a β-class CA from Desulfovibrio vulgaris were dramatically enhanced. Iterative rounds of library design, library generation, and high-throughput screening identified highly stable CA variants that tolerate temperatures of up to 107 °C in the presence of 4.2 M alkaline amine solvent at pH >10.0. This increase in thermostability and alkali tolerance translates to a 4,000,000-fold improvement over the natural enzyme. In conclusion, at pilot scale, the evolved catalyst enhanced the rate of CO2 absorption 25-fold compared with the noncatalyzed reaction.
- Research Organization:
- Codexis, Inc., Redwood City, CA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AR0000071
- OSTI ID:
- 1348349
- Journal Information:
- Proceedings of the National Academy of Sciences of the United States of America, Vol. 111, Issue 46; ISSN 0027-8424
- Publisher:
- National Academy of Sciences, Washington, DC (United States)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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