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Calmodulin inhibitors from Leucophyllum ambiguum
Susana Rojas1, Laura Acevedo, Martha Macías
1Departamento de Farmacia, Facultad de Química, Universidad Nacional Autónoma de México, D.F. 04510, México.
Journal of Natural Products
|March 1, 2003
Summary
Two new lignans were isolated from Leucophyllum ambiguum and found to interact with calmodulin. These compounds inhibited the calmodulin-dependent enzyme cAMP phosphodiesterase, suggesting potential therapeutic applications.
Area of Science:
- Natural Product Chemistry
- Pharmacology
- Medicinal Chemistry
Background:
- Leucophyllum ambiguum is a plant species with potential medicinal properties.
- Lignans are a class of phenolic compounds found in plants, known for diverse biological activities.
Purpose of the Study:
- To isolate and characterize new lignan compounds from Leucophyllum ambiguum.
- To investigate the interaction of isolated compounds with bovine-brain calmodulin and their effect on calmodulin-dependent enzyme activity.
Main Methods:
- Activity-directed fractionation of plant extract.
- Spectroscopic methods (NMR, MS) for structural elucidation.
- X-ray crystallography for structural confirmation of a novel compound.
- Biochemical assays to assess calmodulin interaction and enzyme inhibition.
Main Results:
- Isolation and identification of two new lignans: 2'-methoxykobusin (1) and 2'-methoxy-4'-hydroxydemethoxykobusin (2).
- Identification of known compounds: kobusin (3), 2',2'-dimethoxysesamin (4), trans-cinnamic acid, apigenin, and apigetrin.
- Compounds 1-4 demonstrated interaction with bovine-brain calmodulin.
- Compounds 1-4 inhibited the calmodulin-dependent enzyme cAMP phosphodiesterase.
Conclusions:
- Leucophyllum ambiguum is a source of novel lignan compounds with significant biological activity.
- The isolated lignans modulate calmodulin activity, impacting downstream enzyme function.
- These findings highlight the potential of these lignans as modulators of calmodulin-dependent pathways.