A lipoxygenase inhibitor from Aspergillus niger

Area of Science:

• Biochemistry
• Natural Product Chemistry
• Enzymology

Background:

• Lipoxygenase-1 (LOX-1) is an enzyme implicated in inflammatory pathways.
• Inhibitors of LOX-1 are of therapeutic interest for inflammatory diseases.
• Natural products offer a rich source for novel enzyme inhibitors.

Purpose of the Study:

• To isolate and characterize a novel inhibitor of lipoxygenase-1 (LOX-1) from a microbial source.
• To elucidate the chemical structure of the isolated inhibitor.
• To evaluate the inhibitory activity of the compound against soybean LOX-1 and compare it with known analogues.

Main Methods:

• Fermentation of Aspergillus niger CFTRI 1105.
• Purification using column chromatography and preparative thin layer chromatography.
• Structure elucidation via 1H NMR and Gas Chromatography-Mass Spectrometry (GC-MS).
• Enzyme inhibition assays using soybean LOX-1.

Main Results:

• Isolation and purification of a bisphenol-derivative inhibitor.
• Determination of the inhibitor's structure as 2-(2 -methyl, 4 -hydroxyphenyl), 2-(4"hydroxyphenyl)-propane (MW 242, C16H18O2).
• The inhibitor demonstrated 50% inhibition of soybean LOX-1 at a concentration of 0.98 mM.
• Comparative analysis with bisphenol A, butylhydroxyanisole, and butylhydroxytoluene.

Conclusions:

• A novel LOX-1 inhibitor was successfully isolated from Aspergillus niger.
• The identified bisphenol derivative exhibits significant inhibitory activity against LOX-1.
• Understanding the structure-activity relationship of this inhibitor can guide the development of new anti-inflammatory agents.