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  • Title: Influence of an anion-binding site in the stabilization of halophilic malate dehydrogenase from Haloarcula marismortui.
    Author: Madern D, Ebel C.
    Journal: Biochimie; 2007 Aug; 89(8):981-7. PubMed ID: 17451860.
    Abstract:
    Halophilic proteins have evolved to be soluble, stable and active in high salt concentration. Crystallographic studies have shown that surface enrichment by acidic amino acids is a common structural feature of halophilic proteins. In addition, ion-binding sites have also been observed in most of the cases. The role of chloride-binding sites in halophilic adaptation was addressed in a site-directed mutagenesis study of tetrameric malate dehydrogenase from Haloarcula marismortui. The mutation of K 205, which is involved in an inter-subunit chloride-binding site, drastically modified the enzyme stability in the presence of KCl, but not in the presence of KF. The oligomeric state of the [K205A] mutant changes with the nature of the anion. At high salt concentration, the [K205A] mutant is a dimer when the anion is a chloride ion, whereas it is a tetramer when the fluoride ion is used. The results highlight the role of anion-binding sites in protein adaptation to high salt conditions.
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