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Nitrosation of melatonin by nitric oxide: a computational study
A G Turjanski1, D A Sáenz, F Doctorovich
1Departamento de Química Inorgánica, Analítica y Química-Fisica e INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina. adrian@q1.fcen.uba.ar
Journal of Pineal Research
|September 14, 2001
Summary
Researchers explored how melatonin reacts with nitric oxide (NO), identifying key pathways and reaction sites. Computational tools revealed the indolic nitrogen as the primary target for NO interaction via a radical mechanism.
Area of Science:
- Biochemistry
- Computational Chemistry
- Pharmacology
Background:
- Melatonin is recognized for its therapeutic potential in treating sleep disorders and as an antioxidant.
- The reaction product of melatonin with nitric oxide (NO), N-nitrosomelatonin, has been recently characterized.
- Understanding melatonin's interaction with NO is crucial for its therapeutic applications.
Purpose of the Study:
- To investigate the reaction pathways of melatonin with nitric oxide (NO).
- To identify the most probable sites for nitrosation on the melatonin molecule.
- To elucidate the mechanisms of melatonin-NO interaction using computational methods.
Main Methods:
- Utilized semiempirical AM1 computational tools to model reaction pathways.
- Investigated reactions both in vacuo and in aqueous solution.
- Studied two distinct mechanisms: radical (hydrogen atom abstraction followed by NO addition) and ionic (nitrosonium ion addition).
Main Results:
- The indolic nitrogen (N1) was identified as the most probable site for nitrosation via the radical mechanism.
- Different reaction targets were predicted for the ionic pathway, indicating pathway-dependent reactivity.
- Computational findings align with existing experimental data on melatonin-NO interactions.
Conclusions:
- The study provides a coherent mechanistic understanding of how melatonin interacts with nitric oxide.
- Identified specific reaction sites and mechanisms, contributing to the knowledge of melatonin's chemical behavior.
- Results support the characterization of N-nitrosomelatonin and its formation pathways.