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Effect of some pyrimidine compounds on rat brain monoamine oxidase-B in vitro.

Journal of physiology and biochemistry (2012-04-03)
Nadia Z Shaban, Mamdouh S Masoud, Mai A Mawlawi, Doaa Awad, Omayma M Sadek
ABSTRACT

The effects of some pyrimidine compounds (PCs) including barbituric acid (BA) 5,5-diethyl barbituric acid (DEBA), 2-thiobarbituric acid (TBA), violuric acid (VA), 2-thiouracil (TU), and 6-amino-2-thiouracil (ATU) on the activity of rat brain monoamine oxidase-B (MAO-B) were investigated. The results revealed that MAO-B was activated by BA, DEBA, TBA, TU, and ATU, and the activation was structural, concentration, and time dependent. However, MAO-B was inhibited by VA in a noncompetitive and irreversible manner with an enzyme-inhibitor dissociation constant (K (i) value) of 32 nM and IC(50) equals to 19 nM. All the studied PCs changed both the optimum pH and temperature of MAO-B.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Benzylamine, ReagentPlus®, 99%
Sigma-Aldrich
Benzylamine hydrochloride
Supelco
Benzylamine, for GC derivatization, LiChropur, ≥99.0%
Sigma-Aldrich
Benzylamine, purified by redistillation, ≥99.5%