Uncovering the Dynamics of Urease and Carbonic Anhydrase Genes in Ureolysis, Carbon Dioxide Hydration, and Calcium Carbonate Precipitation

The hydration of CO2 suffers from kinetic inefficiencies that make its natural trapping impractically sluggish. However, CO2-fixing carbonic anhydrases (CAs) remarkably accelerate its equilibration by 6 orders of magnitude and are, therefore, “ideal” catalysts. Notably, CA has been detected in ureol...

Full description

Saved in:
Bibliographic Details
Published in:Environmental science & technology 2024-01, Vol.58 (2), p.1199-1210
Main Authors: Clarà Saracho, Alexandra, Marek, Ewa J.
Format: Article
Language:English
Subjects:
Bacteria
Bioremediation and Biotechnology
Calcium Carbonate
Carbon Dioxide
Carbonic anhydrase
Carbonic anhydrases
Carbonic Anhydrases - genetics
Catalysts
Chemical Precipitation
Genes
Hydration
Trapping
Urea
Urease
Ureolytic bacteria
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The hydration of CO2 suffers from kinetic inefficiencies that make its natural trapping impractically sluggish. However, CO2-fixing carbonic anhydrases (CAs) remarkably accelerate its equilibration by 6 orders of magnitude and are, therefore, “ideal” catalysts. Notably, CA has been detected in ureolytic bacteria, suggesting its potential involvement in microbially induced carbonate precipitation (MICP), yet the dynamics of the urease (Ur) and CA genes remain poorly understood. Here, through the use of the ureolytic bacteriumSporosarcina pasteurii, we investigate the differing role of Ur and CA in ureolysis, CO2 hydration, and CaCO3 precipitation with increasing CO2(g) concentrations. We show that Ur gene up-regulation coincides with an increase in [HCO3 –] following the hydration of CO2 to HCO3 – by CA. Hence, CA physiologically promotes buffering, which enhances solubility trapping and affects the phase of the CaCO3 mineral formed. Understanding the role of CO2 hydration on the performance of ureolysis and CaCO3 precipitation provides essential new insights, required for the development of next-generation biocatalyzed CO2 trapping technologies.
ISSN:0013-936X
1520-5851
DOI:10.1021/acs.est.3c06617