Study of Cis–trans Isomerization Mechanism of [3-(3-Aminomethyl) Phenylazo] Phenyl acetic Acid as a Causative Role in Alzheimer Using Density Functional Theory
Journal Title: International journal of Advanced Biological and Biomedical Research - Year 2013, Vol 1, Issue 11
Abstract
Amyloid-β (Aβ) self-assembly into cross-β amyloidfibrils is implicated in a causative role in Alzheimer’s disease pathology.Uncertainties persist regarding the mechanisms of amyloid self assembly and the role of metastable prefibrillar aggregates. Aβ fibrilsfeature a sheet-turn-sheet motif in the constituent β- strands; as such, turn nucleation has been proposed as a rate-limiting step in the self assembly pathway. Herein, we report the use of an azobenzene β-hairpin mimetic to study byUsing Density Functional Theory the role turn nucleation plays on Aβ self assembly.[3-(3-Aminomethyl) phenylazo] phenyl acetic acid (AMPP)was incorporated into the putative turn region of Aβ42 to elicit temporal control over Aβ42 turn nucleation; it was hypothesized that self-assembly would be favored in the cis-AMPP conformation if β-hairpin formation occurs during Aβ self-assembly and that the trans-AMPP conformer would display attenuated fibrillization propensity. It was unexpectedly observed that the trans-AMPP Aβ42Additionally, cis-trans photo isomerization resulted in rapid formation of native-like amyloid fibrils and trans−cis conversion in the fibril state reduced the population of native-like fibrils. Thus, temporal photo control over Aβ turn conformation providessignificant insight into Aβ self-assembly.
Authors and Affiliations
Hamid Reza Guodarzi| Department of Chemistry, Saveh Branch, Islamic azad University, Saveh, Iran, E-mail: H.r.goudarz@gmail.com, Mohammad. Agha Mohammadi | Department of Chemistry, Bourojerd Branch, Islamic Azad University, Bourojerd, Iran, Mohsen Mousavi| Department of Chemistry, Saveh Branch, Islamic azad University, Saveh, Iran
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