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Genomic structure and differential expression of two tandem-arranged GSTZ genes in rice
Ist Teil von
Gene, 2004-06, Vol.335, p.141-149
Ort / Verlag
Netherlands: Elsevier B.V
Erscheinungsjahr
2004
Link zum Volltext
Quelle
MEDLINE
Beschreibungen/Notizen
Glutathione S-transferases (GSTs) are scavenging enzymes that detoxify cellular xenobiotics and toxins by catalyzing the conjugation of these substrates with a tripeptide glutathione. GSTs are classified depending on gene organization and sequence similarity. The sequence analysis of genomic DNA for zeta class
GST (
GSTZ) locus in rice indicated that two homologous
GSTZ genes lay in a tandem orientation with a short (0.4 kb) intergenic spacer. The upstream
OsGSTZ1 and downstream
OsGSTZ2 spanned 3.5 and 3.2 kb with nine coding exons, respectively. The transcript of
OsGSTZ1 had a long 3′ untranslated region (3′ UTR) that was mostly encoded by a 10th noncoding exon, whereas
OsGSTZ2 mRNA contained a long 5′ UTR. Northern blot analysis showed that
OsGSTZ1/2 messages were strongly expressed in leaf blades, while transcripts from roots were low level. Because
OsGSTZ1/2 messages in leaf tissues were strongly induced only by water treatment, it was difficult to assay for the induction of
OsGSTZ1/2 transcripts by various stress treatments. Thus, using rice culture cells, we analyzed the respective responses of
OsGSTZ1 and
OsGSTZ2 genes against various treatments by real-time reverse transcriptase-polymerase chain reaction (RT-PCR). The results showed that
OsGSTZ1 was expressed at a level ca. 1000-fold higher than
OsGSTZ2 in suspension cells without stress treatment.
OsGSTZ1 was expressed constitutively under various stress conditions. In contrast, the expression of
OsGSTZ2 gene was strongly enhanced to 30-fold by treatment with jasmonic acid. These observations suggested that the expression of
OsGSTZ1 and
OsGSTZ2 genes are differentially regulated in the culture cell of rice.