Merck, A1075-.1MG, Amyloid β Protein Fragment 1-40

General description
Amyloid β Protein Fragment 1-40 (Aβ40) is derived from the amyloid-β protein (Aβ), which is mapped to human chromosome 21q21.3. Aβ40 is predominantly present in the vascular amyloid deposits. Aβ40 comprises of C-terminal membrane insertion domain. It shows structural transition from random coil to a α-helical structure in a water-micelle medium.
Application
Amyloid β Protein Fragment 1-40 has been used:
in the temperature based conformational studies using Fourier transform infrared/differential scanning calorimetry (FT-IR/DSC) studies
as a reference standard in sandwich-type enzyme immunoassay for quantifying amyloid A4 protein in cerebrospinal fluid of patients with head trauma
as a component of embryonic stem cell medium to inhibit amyloid deposition in fibroblasts

Biochem/physiol Actions
Amyloid β-protein is neurotrophic and neurotoxic in vivo and in vitro in human and rat neuronal cell cultures. β-Amyloid peptides (amino acids 1-42 and 1-43) are the major constituents of senile plaques and neurofibrillary tangles that occur in the hippocampus, neocortex, and amygdala of patients with Alzheimer′s disease.
Amyloid β Protein Fragment 1-40 (Aβ40) forms cation based ion channels.
Preparation Note
For maximal biological activity, dilute the stock in calcium-free PBS to 1 mg/ml and incubate at 37 °C for 4 days.
Other Notes
Lyophilized from 0.1% TFA in H2O