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Cd2+-induced aggregation of Escherichia coli pyrophosphatase
Tekijät: Zimenkov YV, Salminen A, Efimova IS, Lahti R, Baykov AA
Kustantaja: BLACKWELL PUBLISHING LTD
Julkaisuvuosi: 2004
Lehti:: European Journal of Biochemistry
Tietokannassa oleva lehden nimi: EUROPEAN JOURNAL OF BIOCHEMISTRY
Lehden akronyymi: EUR J BIOCHEM
Vuosikerta: 271
Numero: 14
Aloitussivu: 3064
Lopetussivu: 3067
Sivujen määrä: 4
ISSN: 0014-2956
DOI: https://doi.org/10.1111/j.1432-1033.2004.04239.x
Tiivistelmä
We report here that Escherichia coli pyrophosphatase aggregates in the presence of millimolar Cd2+. This highly cooperative process was specific to both the metal ion and the protein and could be reversed fully by decreasing the Cd2+ concentration. Aggregation was enhanced by Mg2+, the natural cofactor of pyrophosphatase, and Mn2+. Mutations at the intersubunit metal-binding site had no effect, whereas mutation at Glu139, which is part of the peripheral metal-binding site found in pyrophosphatase crystals near the contact region between two enzyme molecules, suppressed aggregation. These findings indicate that aggregation is affected by Cd2+ binding to the peripheral metal-binding site, probably by strengthening intermolecular Trp149-Trp149' stacking interactions.
We report here that Escherichia coli pyrophosphatase aggregates in the presence of millimolar Cd2+. This highly cooperative process was specific to both the metal ion and the protein and could be reversed fully by decreasing the Cd2+ concentration. Aggregation was enhanced by Mg2+, the natural cofactor of pyrophosphatase, and Mn2+. Mutations at the intersubunit metal-binding site had no effect, whereas mutation at Glu139, which is part of the peripheral metal-binding site found in pyrophosphatase crystals near the contact region between two enzyme molecules, suppressed aggregation. These findings indicate that aggregation is affected by Cd2+ binding to the peripheral metal-binding site, probably by strengthening intermolecular Trp149-Trp149' stacking interactions.
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