β-Amyloid (1-40) Human DAEFRHDSGYEVHHQKLVFFAEDVGSNKGAIIGLMVGGVV-acid
Amino acids 1-40 of amyloid beta a subunit of extracellular plaques found in the brains of patients with Alzheimer’s disease
Catalogue number crb1000087 Molecular Weight 4329.8 Sequence (one letter code) DAEFRHDSGYEVHHQKLVFFAEDVGSNKGAIIGLMVGGVV-acid Sequence (three letter code) H-Asp-Ala-Glu-Phe-Arg-His-Asp-Ser-Gly-Tyr-Glu-Val-His-His-Gln-Lys-Leu-Val-Phe-Phe-Ala-Glu-Asp-Val-Gly-Ser-Asn-Lys-Gly-Ala-Ile-Ile-Gly-Leu-Met-Val-Gly-Gly-Val-Val-OH Molecular Weight 4329.8 Purity >95% References
Masters and Selkoe (2012) Biochemistry of Amyloid -Protein and Amyloid Deposits in Alzheimer Disease. Cold Spring Harb. Perspect. Med. 2(6) a006262 PMID: 22675658
Pearson Peers (2006) Physiological roles for amyloid β peptides. J. Physiol. 575(1) 5 PMID: 16809372
Selkoe and Hardy (2016) The amyloid hypothesis of Alzheimer's disease at 25 years. EMBO Mol. Med. 8(6) 595 PMID: 27025652
Amyloid β-peptide (Aβ) has been identified as the key subunit of the extracellular plaques found in the brains of patients with Alzheimer’s disease (AD) and Down’s syndrome (DS). Aβ has therefore been extensively studied as a potential target for treatment of AD.
Aβ is formed from the cleavage of the large, transmembrane protein; APP (amyloid precursor protein). Cleavage of APP by β- and then γ-secretases results in the formation of Aβ. Aβ can aggregate to produce amyloid-β oligomers, which are thought to be highly neurotoxic. Over time Aβ can further aggregate to produce the characteristic senile plaques present in AD and DS.
Aβ can be degraded by enzymes such as neprilysin, insulin degrading enzyme or endothelin converting enzyme. At physiological levels Aβ may be involved in controlling synaptic activity and neuronal survival.
Aβ1-40 is a major C terminal variant of amyloid beta constituting the most abundant AB peptide in the human brain.