Linked Life Data

8375395

Source:http://linkedlifedata.com/resource/pubmed/id/8375395

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1993-10-15
pubmed:databankReference
pubmed:abstractText
A full-length cDNA clone for a novel glutathione S-transferase was isolated from Arabidopsis thaliana and characterized. The cDNA encodes a polypeptide of 218 amino acids with a calculated molecular mass of 24,363 Da. The sequence was most related to the theta class within the glutathione-S-transferase superfamily of enzymes. The protein encoded by the cDNA was functionally expressed and enzymically active in Escherichia coli; glutathione-S-transferase activity with the standard enzyme substrate 1-chloro-2,4-dinitrobenzene was demonstrated (apparent Km, 10 mM; apparent Km for glutathione, 0.08 mM). The enzyme is substrate specific and did not use several electrophilic reduced-glutathione acceptor molecules for conjugation. However, it efficiently catalyzed the conversion of 13-hydroperoxy-9,11,15-octadecatrienoic acid (Km, 0.67 mM) as well as 13-hydroperoxy-9,11-octadecadienoic acid (Km, 0.79 mM) to the corresponding hydroxy derivatives with concomitant formation of oxidized glutathione. The enzyme did not use H2O2 as substrate. Thus, the cloned A. thaliana enzyme functions as glutathione peroxidase and, in the plant cell, may be involved in the removal of reactive organic hydroperoxides, such as the products of lipid peroxidation. The enzyme is structurally and enzymatically, however, unrelated to the selenium-containing glutathione peroxidases. Enzymic and immunoblotting data suggest that the A. thaliana enzyme is soluble and constitutively expressed in vegetative rosettes, but is under developmental control during the transition to bolting and flowering.
pubmed:commentsCorrections
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
0014-2956
pubmed:author
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
216
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
579-86
pubmed:dateRevised
2007-7-23
pubmed:meshHeading
pubmed:year
1993
pubmed:articleTitle
A glutathione S-transferase with glutathione-peroxidase activity from Arabidopsis thaliana. Molecular cloning and functional characterization.
pubmed:affiliation
Lehrstuhl für Pflanzenphysiologie, Ruhr-Universität Bochum, Germany.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't