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• W2402211843 abstract "Solvolytic dissociation rate constants (kd) of bovine carbonic anhydrase II (CA) and its metallovariants (M-CAs, M=Co(II), Ni(II), Cu(II), Zn(II), and Cd(II)) were estimated by a ligand substitution reaction, which was monitored by affinity capillary electrophoresis to selectively detect the undissociated CAs in the reaction mixture. Using EDTA as the competing ligand for Zn-CA, the dissociation followed the unimolecular nucleophilic substitution (SN1) mechanism with kd=1.0×10(-7)s(-1) (pH7.4, 25°C). The corresponding solvolysis half-life (t1/2) was 80days, showing the exceptionally high kinetic stability of t Zn-CA, in contrast to the highly labile [Zn(II)(H2O)6](2+), where the water exchange rate (kex) is high. This behavior is attributed to the tetrahedral coordination geometry supported by the tris(histidine) unit (His3) of CA. In the case of Co-CA, it showed a somewhat larger kd value (5.7×10(-7)s(-1), pH7.4, 25°C) even though it shares the same tetrahedral coordination environment with Zn-CA, suggesting that the d(7) electronic configuration of Co(II) in the transition state of the dissociation is stabilized by the ligand field. Among M-CAs, only Ni-CA showed a bimolecular nucleophilic substitution (SN2) reaction path in its reaction with EDTA, implying that the large coordination number (6) of Ni(II) in Ni-CA allows EDTA to form an EDTA-Ni-CA intermediate. Overall, kd values roughly correlated with kex values among M-CAs, with the kd value of Zn-CA deviating strongly from the trend and highlighting the exceptionally high kinetic stabilization of Zn-CA by the His3 unit." @default.
• W2402211843 created "2016-06-24" @default.
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• W2402211843 date "2016-08-01" @default.
• W2402211843 modified "2023-09-24" @default.
• W2402211843 title "High kinetic stability of ZnII coordinated by the tris(histidine) unit of carbonic anhydrase towards solvolytic dissociation studied by affinity capillary electrophoresis" @default.
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• W2402211843 doi "https://doi.org/10.1016/j.jinorgbio.2016.05.013" @default.
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