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char = y;code = 121
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char = e;code = 101
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char = ;code = 32
char = k;code = 107
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char = t;code = 116
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char = m;code = 109
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char = c;code = 99
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char = i;code = 105
char = d;code = 100
char = .;code = 46
result sql = Tyrosine gated electron transfer is key to the toxic mechanism of Alzheimer's disease beta-amyloid.
Tyrosine gated electron transfer is key to the toxic mechanism of Alzheimer's disease beta-amyloid.
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char = D;code = 68
char = );code = 41
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char = a;code = 97
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char = e;code = 101
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char = i;code = 105
char = t;code = 116
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
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char = m;code = 109
char = a;code = 97
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char = o;code = 111
char = r;code = 114
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char = c;code = 99
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char = t;code = 116
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char = g;code = 103
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char = f;code = 102
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char = e;code = 101
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char = i;code = 105
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char = A;code = 65
char = D;code = 68
char = .;code = 46
char = ;code = 32
char = A;code = 65
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char = o;code = 111
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char = c;code = 99
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char = t;code = 116
char = y;code = 121
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char = i;code = 105
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char = ;code = 32
char = l;code = 108
char = i;code = 105
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char = k;code = 107
char = e;code = 101
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char = t;code = 116
char = o;code = 111
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char = o;code = 111
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char = e;code = 101
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char = e;code = 101
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char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
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char = t;code = 116
char = a;code = 97
char = l;code = 108
char = s;code = 115
char = ,;code = 44
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char = ;code = 32
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char = a;code = 97
char = d;code = 100
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = s;code = 115
char = ;code = 32
char = f;code = 102
char = a;code = 97
char = c;code = 99
char = i;code = 105
char = l;code = 108
char = i;code = 105
char = t;code = 116
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = e;code = 101
char = l;code = 108
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = r;code = 114
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = n;code = 110
char = s;code = 115
char = f;code = 102
char = e;code = 101
char = r;code = 114
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = a;code = 97
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = q;code = 113
char = u;code = 117
char = i;code = 105
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = d;code = 100
char = r;code = 114
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = .;code = 46
char = ;code = 32
char = C;code = 67
char = o;code = 111
char = n;code = 110
char = f;code = 102
char = i;code = 105
char = r;code = 114
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = o;code = 111
char = r;code = 114
char = e;code = 101
char = t;code = 116
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = u;code = 117
char = l;code = 108
char = t;code = 116
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = m;code = 109
char = u;code = 117
char = t;code = 116
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = y;code = 121
char = r;code = 114
char = o;code = 111
char = s;code = 115
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = i;code = 105
char = d;code = 100
char = u;code = 117
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = a;code = 97
char = l;code = 108
char = a;code = 97
char = n;code = 110
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = h;code = 104
char = i;code = 105
char = b;code = 98
char = i;code = 105
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = H;code = 72
char = 2;code = 50
char = O;code = 79
char = 2;code = 50
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ,;code = 44
char = ;code = 32
char = C;code = 67
char = u;code = 117
char = -;code = 45
char = i;code = 105
char = n;code = 110
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = r;code = 114
char = a;code = 97
char = d;code = 100
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = i;code = 105
char = z;code = 122
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ,;code = 44
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = t;code = 116
char = y;code = 121
char = r;code = 114
char = o;code = 111
char = s;code = 115
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = r;code = 114
char = o;code = 111
char = s;code = 115
char = s;code = 115
char = -;code = 45
char = l;code = 108
char = i;code = 105
char = n;code = 110
char = k;code = 107
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = n;code = 110
char = e;code = 101
char = u;code = 117
char = r;code = 114
char = o;code = 111
char = t;code = 116
char = o;code = 111
char = x;code = 120
char = i;code = 105
char = c;code = 99
char = i;code = 105
char = t;code = 116
char = y;code = 121
char = .;code = 46
char = <;code = 60
char = b;code = 98
char = r;code = 114
char = /;code = 47
char = >;code = 62
result sql = Alzheimer's disease (AD) is characterized by the presence of neurofibrillary tangles and amyloid plaques, which are abnormal protein deposits. The major constituent of the plaques is the neurotoxic beta-amyloid peptide (Abeta); the genetics of familial AD support a direct role for this peptide in AD. Abeta neurotoxicity is linked to hydrogen peroxide formation. Abeta coordinates the redox active transition metals, copper and iron, to catalytically generate reactive oxygen species. The chemical mechanism underlying this process is not well defined. With the use of density functional theory calculations to delineate the chemical mechanisms that drive the catalytic production of H2O2 by Abeta/Cu, tyrosine10 (Y10) was identified as a pivotal residue for this reaction to proceed. The relative stability of tyrosyl radicals facilitates the electron transfers that are required to drive the reaction. Confirming the theoretical results, mutation of the tyrosine residue to alanine inhibited H2O2 production, Cu-induced radicalization, dityrosine cross-linking, and neurotoxicity.

Publication: FASEB J. 2004 Sep ;18(12)::1427-9.
Publication Date: 2004 Sep
Study Author(s): Barnham, Kevin J;Haeffner, Fredrik;Ciccotosto, Giuseppe D;Curtain, Cyril C;Tew, Deborah;Mavros, Christine;Beyreuther, Konrad;Carrington, Darryl;Masters, Colin L;Cherny, Robert A;Cappai, Roberto;Bush, Ashley I;
Institution: Department of Pathology, University of Melbourne, Victoria, Australia. [email protected]
Shortcut link to this study:
Alzheimer's disease (AD) is characterized by the presence of neurofibrillary tangles and amyloid plaques, which are abnormal protein deposits. The major constituent of the plaques is the neurotoxic beta-amyloid peptide (Abeta); the genetics of familial AD support a direct role for this peptide in AD. Abeta neurotoxicity is linked to hydrogen peroxide formation. Abeta coordinates the redox active transition metals, copper and iron, to catalytically generate reactive oxygen species. The chemical mechanism underlying this process is not well defined. With the use of density functional theory calculations to delineate the chemical mechanisms that drive the catalytic production of H2O2 by Abeta/Cu, tyrosine10 (Y10) was identified as a pivotal residue for this reaction to proceed. The relative stability of tyrosyl radicals facilitates the electron transfers that are required to drive the reaction. Confirming the theoretical results, mutation of the tyrosine residue to alanine inhibited H2O2 production, Cu-induced radicalization, dityrosine cross-linking, and neurotoxicity.
PMID: 15231727

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