posted on 2012-08-06, 00:00authored byYamini
P. Ginotra, Shefali N. Ramteke, Rapole Srikanth, Prasad P. Kulkarni
In Alzheimer’s disease, copper binds to amyloid
beta (Aβ)
peptide and generates oxidative stress. The coordination of histidine
(His) residues to Cu2+ is still uncertain. We studied Cu2+ binding to Aβ1–16 peptide using the diethyl
pyrocarbonate (DEPC) assay and mass spectrometry. Our results show
that only one His is involved in Cu2+ coordination, which
is identified as His6 using mass spectral studies. Novel nickel displacement
studies have further supported the proposal that the Cu2+ binding site of Aβ1–16 peptide resembles the ATCUN
motif of human serum albumin.