Abstract
Carbonic anhydrase (CA) was purified from Micrococcus lylae and Micrococcus luteus with 49.90 and 53.8 % yield, respectively, isolated from calcium carbonate kilns. CA from M. lylae retained 80 % stability in the pH and temperature range of 6.0–8.0 and 35–45 °C, respectively. However, CA from M. luteus was stable in the pH and temperature range of 7.5–10.0 and 35–55 °C, respectively. Cross-linked enzyme aggregates (CLEAs) raised the transition temperature of M. lylae and M. luteus CA up to 67.5 and 74.0 °C, while the operational stability (T 1/2) of CA at 55 °C was calculated to be 7.7 and 12.0 h, respectively. CA from both the strains was found to be monomeric in nature with subunit molecular weight and molecular mass of 29 kDa. Ethoxozolamide was identified as the most potent inhibitor based on both IC50 values and inhibitory constant measurement (K i). The K m and V max for M. lylae CA (2.31 mM; 769.23 μmol/mg/min) and M. luteus CA (2.0 mM; 1,000 μmol/mg/min) were calculated from Lineweaver–Burk plots in terms of esterase activity. Enhanced thermostability of CLEAs alleviates its role in operational stability for application at an on-site scrubber. The characteristic profile of purified CA from Micrococcus spp. advocates its effective application in biomimetic CO2 sequestration.
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The authors are thankful to DBT, New Delhi for providing the financial assistance, and A. Bhattacharya is thankful to CSIR New Delhi for granting the CSIR-SRF fellowship.
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Bhattacharya, A., Shrivastava, A. & Sharma, A. Evaluation of Enhanced Thermostability and Operational Stability of Carbonic Anhydrase from Micrococcus Species. Appl Biochem Biotechnol 170, 756–773 (2013). https://doi.org/10.1007/s12010-013-0226-y
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DOI: https://doi.org/10.1007/s12010-013-0226-y