Synthesis and characterization of CAPE derivatives as xanthine oxidase inhibitors with radical scavenging properties.

Abstract:

:Inhibitors of the enzyme xanthine oxidase (XO) with radical scavenging properties hold promise as novel agents against reperfusion injuries after ischemic events. By suppressing the formation of damaging reactive oxygen species (ROS) by XO or scavenging ROS from other sources, these compounds may prevent a buildup of ROS in the aftermath of a heart attack or stroke. To combine these two properties in a single molecule, we synthesized and characterized the non-purine XO inhibitor caffeic acid phenethylester (CAPE) and 19 derivatives using a convenient microwave-assisted Knoevenagel condensation protocol. Varying systematically the number and positions of the hydroxyl groups at the two phenyl rings, we derived structure-activity relationships based on experimentally determined XO inhibition data. Molecular docking suggested that critical enzyme/inhibitor interactions involved π-π interactions between the phenolic inhibitor ring and Tyr914, hydrogen bonds between inhibitor hydroxyl groups and Glu802, and hydrophobic interactions between the CAPE phenyl ring and non-polar residues located at the entrance of the binding site. To effectively scavenge the stable radical DPPH, two hydroxyl groups in 1,2- or 1,4-position at the phenyl ring were required. Among all compounds tested, E-phenyl 3-(3,4-dihydroxyphenyl)acrylate, a CAPE analog without the ethyl tether, showed the most promising properties.

journal_name

Bioorg Chem

journal_title

Bioorganic chemistry

authors

Choi W,Villegas V,Istre H,Heppler B,Gonzalez N,Brusman N,Snider L,Hogle E,Tucker J,Oñate A,Oñate S,Ma L,Paula S

doi

10.1016/j.bioorg.2019.02.049

subject

Has Abstract

pub_date

2019-05-01 00:00:00

pages

686-695

eissn

0045-2068

issn

1090-2120

pii

S0045-2068(18)31512-8

journal_volume

86

pub_type

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