Endogenous neurotransmitters as anti-amigdaloidic agents: A density functional investigation of the interaction between melatonin and histidine

Luca F. Pisterzi, David R P Almeida, Donna M. Gasparro, Jason R. Juhasz, B. Penke, G. Tasi, I. Csizmadia

Research output: Contribution to journalArticle

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Abstract

Recent insight has implicated the formation of β-amyloid fibril formation as a culpable process for the progression of Alzheimer's disease. Amyloid-β (Aβ) is a peptide naturally secreted by neurons in a random coil structure. It has been deduced that a conformational transition from a random coil to a β-pleated sheet is responsible for Aβ's neurotoxicity. The disruption of a His-Asp salt bridge has been found to inhibit this conformational change to the β-pleated sheet - a phenomenon observed in vitro when the peptides are incubated with melatonin. To further investigate this interaction between melatonin and histidine, the binding was investigated at the B3LYP/6-31g(d) level of theory for the two lowest energy conformers of melatonin: χ2=g+, χ3=anti, χ4=g+, and χ2=g-, χ3=anti, χ4=g-, and imidazolium. The most favorable interaction was found to be an intersecting one; the respective counterpoise corrected binding energies were found to be -17.8 and -19.8kcal/mol.

Original languageEnglish
Pages (from-to)521-525
Number of pages5
JournalJournal of Molecular Structure: THEOCHEM
Volume666-667
DOIs
Publication statusPublished - Dec 29 2003

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Keywords

  • Amyloid beta peptide
  • Density functional theory
  • Imidazolium
  • Melatonin
  • Neurofibrillary tangles

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Computational Theory and Mathematics
  • Atomic and Molecular Physics, and Optics

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