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Title: Carbonic Anhydrase Robustness for Use in Nanoscale CO 2 Capture Technologies

Journal Article · · ACS Omega
 [1];  [2];  [3];  [4]; ORCiD logo [5]; ORCiD logo [1]; ORCiD logo [3]; ORCiD logo [3]
  1. Department of Physics, The University of Vermont, Burlington, Vermont 05405-0160, United States
  2. Memzyme, LLC, Albuquerque, New Mexico 87123, United States
  3. Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
  4. Epigentor Consultants, Inc., Miami, Florida 87185, United States
  5. Electronic, Optical, and Nanomaterials Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States

Continued dependence on crude oil and natural gas resources for fossil fuels has caused global atmospheric carbon dioxide (CO2) emissions to increase to record-setting proportions. There is an urgent need for efficient and inexpensive carbon sequestration systems to mitigate large-scale emissions of CO2 from industrial flue gas. Carbonic anhydrase (CA) has shown high potential for enhanced CO2 capture applications compared to conventional absorption-based methods currently utilized in various industrial settings. This study aims to understand structural aspects that contribute to the stability of CA enzymes critical for their applications in industrial processes, which require the ability to withstand conditions different from those in their native environments. Here, we evaluated the thermostability and enzyme activity of mesophilic and thermophilic CA variants at different temperature conditions and in the presence of atmospheric gas pollutants like nitrogen oxides and sulfur oxides. Based on our enzyme activity assays and molecular dynamics simulations, we see increased conformational stability and CA activity levels in thermostable CA variants incubated week-long at different temperature conditions. The thermostable CA variants also retained high levels of CA activity despite changes in solution pH due to increasing NO and SO2 concentrations. A loss of CA activity was observed only at high concentrations of NO/SO2 that possibly can be minimized with the appropriate buffered solutions.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
TCF-17-13314; NA0003525
OSTI ID:
2007674
Alternate ID(s):
OSTI ID: 2202582; OSTI ID: 2320334
Report Number(s):
SAND-2024-02785J
Journal Information:
ACS Omega, Journal Name: ACS Omega Vol. 8 Journal Issue: 41; ISSN 2470-1343
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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