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pubmed-article:1898739pubmed:abstractTextWe have found that many dianionic species, at millimolar concentrations, significantly activate or inhibit the bovine carbonic anhydrase III-catalyzed hydration of CO2. Dianionic species such as HPO2-4 and SO2-3, with pKb values near 7, are activators, whereas weakly basis species such as SO2-4 act as inhibitors. Both activation and inhibition are partial hyperbolic in nature and do not appear to compete with monoanionic linear inhibitors like N-3. Our kinetic data are consistent with a formal mechanism of action for carbonic anhydrase III that is directly analogous to that of carbonic anhydrase II, in which Lys-64 of carbonic anhydrase III can act as an intramolecular H+ transfer group during CO2 hydration. Our data suggest that dianionic inhibitors depress the rate of H+ transfer during turnover by stabilizing the protonated form of Lys-64. We postulate that dianionic activators enhance the rate of a rate-limiting H+ transfer step in the mechanism, probably by acting directly as H+ acceptors.lld:pubmed
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pubmed-article:1898739pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:1898739pubmed:articleTitleActivation and inhibition of bovine carbonic anhydrase III by dianions.lld:pubmed
pubmed-article:1898739pubmed:affiliationDepartment of Chemistry, Colgate University, Hamilton, New York 13346.lld:pubmed
pubmed-article:1898739pubmed:publicationTypeJournal Articlelld:pubmed
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