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Activation studies of the β-carbonic anhydrases from Escherichia coli with amino acids and amines.

ABSTRACT: A β-carbonic anhydrase (CA, EC 4.2.1.1) from the widespread bacterium Escherichia coli (EcoCAβ), encoded by the CynT2 gene, has been investigated for its catalytic properties and enzymatic activation by a panel of amino acids and amines. EcoCAβ showed a significant catalytic activity for the hydration of CO₂ to bicarbonate and a proton, with a kinetic constant k_cat of 5.3 × 10⁵ s^- and a Michaelis-Menten constant K_M of 12.9 mM. The most effective EcoCAβ activators were L- and D-DOPA, L-Tyr, 4-amino-Phe, serotonin and L-adrenaline, with K_As from 2.76 to 10.7 µM. L-His, 2-pyridyl-methylamine, L-Asn and L-Gln were relatively weak activators (K_As from 36.0 to 49.5 µM). D-His, L- and D-Phe, L- and D-Trp, D-Tyr, histamine, dopamine, 2-(aminoethyl)pyridine/piperazine/morpholine, L-Asp, L- and D-Glu have K_As from 11.3 to 23.7 µM. Endogenous CA activators may play a role in bacterial virulence and colonisation of the host.

SUBMITTER: Nocentini A

PROVIDER: S-EPMC7748406 | biostudies-literature |

REPOSITORIES: biostudies-literature

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