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Related Experiment Videos

Interaction between morphine and lysine.

S Nakai1, F Yoneda

  • 1Fujimoto Pharmaceutical Corporation, 1-3-40Nishi-Otsuka, Matsubara-shi, 580-8503, Osaka, Japan. soyaku@fujimoto-pharm.co.jp

Bioorganic & Medicinal Chemistry Letters
|May 30, 2001
PubMed
Summary
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Molecular orbital theory reveals morphine interacts with lysine via hydrogen bonding, suggesting lysine is the key binding site in the mu-opioid receptor.

Area of Science:

  • Computational Chemistry
  • Molecular Biology
  • Pharmacology

Background:

  • Morphine is a potent opioid analgesic.
  • Understanding morphine's binding mechanism is crucial for drug development.
  • The mu-opioid receptor is a primary target for morphine.

Purpose of the Study:

  • To investigate the molecular interactions between morphine and amino acids.
  • To identify the specific amino acid responsible for morphine binding.
  • To elucidate the binding mechanism at the molecular level.

Main Methods:

  • Utilizing molecular orbital theory to model interactions.
  • Analyzing hydrogen bonding patterns and proton transfer.
  • Calculating stabilization energies for different interaction types.

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Main Results:

  • Morphine and lysine form two distinct interaction types (A and B).
  • Type A involves three hydrogen bonds with 45.3 kcal/mol stabilization.
  • Type B involves one hydrogen bond and proton transfer with 34.9 kcal/mol stabilization.

Conclusions:

  • Lysine exhibits unique and strong interactions with morphine compared to other amino acids.
  • These findings strongly suggest lysine as the primary binding point of morphine in the mu-opioid receptor.
  • This provides a molecular basis for morphine's interaction with its target receptor.