Linked Life Data

12076317

Source:http://linkedlifedata.com/resource/pubmed/id/12076317

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2002-6-21
pubmed:abstractText
The effect of phenyl selenoacetylene and its selenoxide on delta-aminolevulinate dehydratase from liver of adult rats (mammalian source) and from cucumber leaves (plant source) was investigated. In vivo, selenides can be oxidized to selenoxides by flavin-containing monooxygenases and selenoxides can regenerate selenides by thiol oxidation. The compound phenyl selenoacetylene was converted to selenoxides by reaction with hydrogen peroxide. Phenyl selenoacetylene inhibited mammalian and plant delta-aminolevulinate dehydratase with an IC50 about 250 microM and >400 microM, respectively. Its selenoxide inhibited the enzyme more strongly, with IC50 values of 45 microM and 100 microM for the mammalian and plant source, respectively. The selenoxide inhibitory action was antagonized by dithiothreitol suggesting the involvement of -SH groups. Moreover, delta-aminolevulinate dehydratase from a plant source was inhibited by the selenoxide, suggesting a possible involvement of -SH groups located at a site distinct from the region implicated in Zn2+ binding in mammalian delta-aminolevulinate dehydratase. The results of the present study suggest that (i) delta-aminolevulinate dehydratase is a potential molecular target for phenyl selenoacetylene, due to the oxidation of enzyme sulfhydryl groups, and that (ii) the monooxygenation of this selenocompound, which in vivo could be possibly mediated by flavin-containing monooxigenases, increases its inhibitory effect.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0901-9928
pubmed:author
pubmed:issnType
Print
pubmed:volume
90
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
214-9
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2002
pubmed:articleTitle
Delta-aminolevulinate dehydratase inhibition by phenyl selenoacetylene: effect of reaction with hydrogen peroxide.
pubmed:affiliation
Department of Chemistry, Center of Natural and Exact Sciences, Federal University of Santa Maria, 97105-900, Santa Maria, RS, Brazil.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't