Abstract:
:A recombinant carbonic anhydrase (CA, EC 4.2.1.1) from the soil-dwelling bacterium Enterobacter sp. B13 was cloned and purified by Co(2+) affinity chromatography. Bioinformatic analysis showed that the new enzyme (denominated here B13-CA) belongs to the β-class CAs and to possess 95% homology with the ortholog enzyme from Escherichia coli encoded by the can gene, whereas its sequence homology with the other such enzyme from E. coli (encoded by the cynT gene) was of 33%. B13-CA was characterized kinetically as a catalyst for carbon dioxide hydration to bicarbonate and protons. The enzyme shows a significant catalytic activity, with the following kinetic parameters at 20 °C and pH of 8.3: kcat of 4.8 × 10(5) s(-1) and kcat/Km of 5.6 × 10(7) M(-1) × s(-1). This activity was potently inhibited by acetazolamide which showed a KI of 78.9 nM. Although only this compound was investigated for the moment as B13-CA inhibitor, further studies may reveal new classes of inhibitors/activators of this enzyme which may show biomedical or environmental applications, considering the posssible role of this enzyme in CaCO3 biomineralization processes.
journal_name
J Enzyme Inhib Med Chemjournal_title
Journal of enzyme inhibition and medicinal chemistryauthors
Eminoğlu A,Vullo D,Aşık A,Çolak DN,Supuran CT,Çanakçı S,Osman Beldüz Adoi
10.3109/14756366.2015.1100176subject
Has Abstractpub_date
2016-12-01 00:00:00pages
1111-8issue
6eissn
1475-6366issn
1475-6374journal_volume
31pub_type
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