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BioAssay: AID 630224

Inhibition of human 5-LOX in human peripheral blood mononuclear leukocytes assessed as inhibition of calymycin A23187 stimulated LTB4 production at 10 uM preincubated for 15 mins before stimulation measured after 15 mins by enzyme immunoassay

A bioassay-guided investigation of Melicope ptelefolia Champ ex Benth (Rutaceae) resulted in the identification of an acyphloroglucinol, 2,4,6-trihydroxy-3-geranylacetophenone or tHGA, as the active principle inhibiting soybean 15-LOX. The anti-inflammatory action was also demonstrated on human leukocytes, where the compound showed prominent inhibitory activity against human PBML 5-LOX, with an more ..
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 Tested Compounds
 Tested Compounds
All(1)
 
 
Unspecified(1)
 
 
 Tested Substances
 Tested Substances
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Unspecified(1)
 
 
 Related BioAssays
 Related BioAssays
AID: 630224
Data Source: ChEMBL (787672)
Depositor Category: Literature, Extracted
BioAssay Version:
Deposit Date: 2012-09-09
Modify Date: 2014-08-23

Data Table ( Complete ):           View All Data
Target
Sequence: RecName: Full=Arachidonate 5-lipoxygenase; Short=5-LO; Short=5-lipoxygenase
Description ..   
Protein Family: Lipoxygenase
Comment ..   

Gene:ALOX5     Related Protein 3D Structures     More BioActivity Data..
Tested Compound:
Description:
Title: Bioassay-guided identification of an anti-inflammatory prenylated acylphloroglucinol from Melicope ptelefolia and molecular insights into its interaction with 5-lipoxygenase.

Abstract: A bioassay-guided investigation of Melicope ptelefolia Champ ex Benth (Rutaceae) resulted in the identification of an acyphloroglucinol, 2,4,6-trihydroxy-3-geranylacetophenone or tHGA, as the active principle inhibiting soybean 15-LOX. The anti-inflammatory action was also demonstrated on human leukocytes, where the compound showed prominent inhibitory activity against human PBML 5-LOX, with an IC(50) value of 0.42 I(1/4)M, very close to the effect produced by the commonly used standard, NDGA. The compound concentration-dependently inhibited 5-LOX product synthesis, specifically inhibiting cysteinyl leukotriene LTC(4) with an IC(50) value of 1.80 I(1/4)M, and showed no cell toxicity effects. The anti-inflammatory action does not seem to proceed via redox or metal chelating mechanism since the compound tested negative for these bioactivities. Further tests on cyclooxygenases indicated that the compound acts via a dual LOX/COX inhibitory mechanism, with greater selectivity for 5-LOX and COX-2 (IC(50) value of 0.40 I(1/4)M). The molecular features that govern the 5-LOX inhibitory activity was thus explored using in silico docking experiments. The residues Ile 553 and Hie 252 were the most important residues in the interaction, each contributing significant energy values of -13.45 (electrostatic) and -5.40 kcal/mol (electrostatic and Van der Waals), respectively. The hydroxyl group of the phloroglucinol core of the compound forms a 2.56A
(PMID: 21958738)
Categorized Comment - additional comments and annotations
From BioAssay Depositor:
Assay Type: Binding
Target Type: Target is a single protein chain
Assay Data Source: Scientific Literature
Protein Target Class: enzyme reductase
Result Definitions
TIDNameDescriptionHistogramTypeUnit
OutcomeThe BioAssay activity outcomeOutcome
1Inhibition activity commentInhibition activity commentString
2Inhibition standard flagInhibition standard flagInteger
3Inhibition qualifierInhibition qualifierString
4Inhibition published valueInhibition published valueFloat%
5Inhibition standard valueInhibition standard valueFloat%

Data Table (Concise)
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