期刊
BIOORGANIC & MEDICINAL CHEMISTRY
卷 24, 期 4, 页码 835-840出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bmc.2016.01.005
关键词
Carbonic anhydrase; Metalloenzymes; Inhibitors; Anions; Psychrophiles; Hydratase activity; Antarctic carbonic anhydrase; Cold adaptation; Cold-enzymes
资金
- Italian National Antarctic Research Project PNRA [2013/AZ1.02]
- vice deanship of research chairs of King Saud University, Riyadh, Saudi Arabia
- Distinguished Scientist Fellowship Program (DSFP) of King Saud University, Riyadh, Saudi Arabia
We have cloned, purified and characterized the gamma-carbonic anhydrase (CA, EC 4.2.1.1) present in the genome of the Antarctic bacterium Colwellia psychrerythraea, which is an obligate psychrophile. The enzyme shows a significant catalytic activity for the physiologic reaction of CO2 hydration to bicarbonate and protons, with the following kinetic parameters: k(cat) of 6.0 x 10(5) s(-1) and a k(cat)/K-m of 4.7 x 10(6) M-1 x s(-1). This activitywas inhibited by the sulfonamide CA inhibitor (CAI) acetazolamide, with a K-I of 502 nM. A range of anions was also investigated for their inhibitory action against the new enzyme CpsCA. Perchlorate, tetrafluoroborate, fluoride and bromide were not inhibitory, whereas cyanate, thiocyanate, cyanide, hydrogensulfide, carbonate and bicarbonate showed K(I)s in the range of 1.4-4.4 mM. Diethyldithiocarbamate was a better inhibitor (K-I of 0.58 mM) whereas sulfamide, sulfamate, phenylboronic acid and phenylarsonic acid were the most effective inhibitors detected, with K(I)s ranging between 8 and 38 mu M. The present study may shed some more light regarding the role that gamma-CAs play in the life cycle of psychrophilic bacteria as the Antarctic one investigated here. (c) 2016 Elsevier Ltd. All rights reserved.
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