Journal
JOURNAL OF ENZYME INHIBITION AND MEDICINAL CHEMISTRY
Volume 31, Issue 5, Pages 810-817Publisher
TAYLOR & FRANCIS LTD
DOI: 10.3109/14756366.2015.1069289
Keywords
Antarctic carbonic anhydrase; carbonic anhydrase; cyanobacteria; hydratase activity; metalloenzymes
Funding
- Distinguished Scientist Fellowship Program (DSFP) at KSU
- FP7 EU project (Dynano)
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Carbonic anhydrases (CAs, EC 4.2.1.1) catalyze the CO2 hydration/dehydration reversible reaction: CO2 + H2O (sic) HCO3- + H+. Living organisms encode for at least six distinct genetic families of such catalyst, the alpha-, beta-, gamma-, delta-, zeta- and eta-CAs. The main function of the CAs is to quickly process the CO2 derived by metabolic processes in order to regulate acid-base homeostasis, connected to the production of protons (H+) and bicarbonate. Few data are available in the literature on Antarctic CAs and most of the scientific information regards CAs isolated from mammals or prokaryotes (as well as other mesophilic sources). It is of great interest to study the biochemical behavior of such catalysts identified in organism living in the Antarctic sea where temperatures average -1.9 circle C all year round. The enzymes isolated from Antarctic organisms represent a useful tool to study the relations among structure, stability and function of proteins in organisms adapted to living at constantly low temperatures. In the present paper, we report in detail the cloning, purification, and physico-chemical properties of NcoCA, a gamma-CA isolated from the Antarctic cyanobacterium Nostoc commune. This enzyme showed a higher catalytic efficiency at lower temperatures compared to mesophilic counterparts belonging to alpha-, beta-, gamma-classes, as well as a limited stability at moderate temperatures.
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