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J Biol Chem, Vol. 273, Issue 21, 12817-12826, May 22, 1998
Dramatic Aggregation of Alzheimer A by Cu(II) Is Induced by
Conditions Representing Physiological Acidosis
Craig S.
Atwood ,
Robert D.
Moir§,
Xudong
Huang ,
Richard C.
Scarpa ,
N. Michael E.
Bacarra ,
Donna M.
Romano§,
Mariana A.
Hartshorn ,
Rudolph E.
Tanzi§, and
Ashley I.
Bush
From the Department of Psychiatry and Genetics and
Aging Unit and the § Department of Neurology and Genetics
and Aging Unit, Massachusetts General Hospital, Harvard Medical School,
Boston, Massachusetts 02114
The cortical deposition of A is an event that
occurs in Alzheimer's disease, Down's syndrome, head injury, and
normal aging. Previously, in appraising the effects of different
neurochemical factors that impact upon the solubility of A , we
observed that Zn2+ was the predominant bioessential
metal to induce the aggregation of soluble A at pH 7.4 in
vitro and that this reaction is totally reversible with
chelation. We now report that unlike other biometals tested at maximal
biological concentrations, marked Cu2+-induced aggregation
of A 1-40 emerged as the solution pH was lowered from
7.4 to 6.8 and that the reaction was completely reversible with either
chelation or alkalinization. This interaction was comparable to the
pH-dependent effect of Cu2+ on insulin
aggregation but was not seen for aprotinin or albumin. A 1-40 bound three to four Cu2+ ions when
precipitated at pH 7.0. Rapid, pH-sensitive aggregation occurred at low
nanomolar concentrations of both A 1-40 and
A 1-42 with submicromolar concentrations of
Cu2+. Unlike A 1-40, A 1-42
was precipitated by submicromolar Cu2+ concentrations at pH
7.4. Rat A 1-40 and histidine-modified human
A 1-40 were not aggregated by Zn2+,
Cu2+, or Fe3+, indicating that histidine
residues are essential for metal-mediated A assembly. These results
indicate that H+-induced conformational changes unmask a
metal-binding site on A that mediates reversible assembly of the
peptide. Since a mildly acidic environment together with increased
Zn2+ and Cu2+ are common features of
inflammation, we propose that A aggregation by these factors may be
a response to local injury. Cu2+, Zn2+, and
Fe3+ association with A explains the recently reported
enrichment of these metal ions in amyloid plaques in Alzheimer's
disease.
Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.

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C. C. Curtain, F. Ali, I. Volitakis, R. A. Cherny, R. S. Norton, K. Beyreuther, C. J. Barrow, C. L. Masters, A. I. Bush, and K. J. Barnham
Alzheimer's Disease Amyloid-beta Binds Copper and Zinc to Generate an Allosterically Ordered Membrane-penetrating Structure Containing Superoxide Dismutase-like Subunits
J. Biol. Chem.,
June 1, 2001;
276(23):
20466 - 20473.
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J.-Y. Lee, I. Mook-Jung, and J.-Y. Koh
Histochemically Reactive Zinc in Plaques of the Swedish Mutant {beta}-Amyloid Precursor Protein Transgenic Mice
J. Neurosci.,
June 1, 1999;
19(11):
RC10 - RC10.
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Copyright © 1998 by the American Society for Biochemistry and Molecular Biology.
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