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Structural Analysis of a Maize Gene Coding for Glutathione-S-transferase Involved in Herbicide Detoxification

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Journal Plant Mol Biol
Date 2013 Dec 6
PMID 24307319
Citations 18
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Abstract

We have used the cDNA clone encoding maize glutathione-S-transferase (GST I) to isolate a genomic DNA clone containing the complete GST I gene. Nucleotide sequence analysis of the cDNA and genomic clones has yielded a complete amino acid sequence for maize GST I and provided the exon-intron map of its gene. The mRNA homologous sequences in the maize GST I gene consist of a 107 bp 5' untranslated region, a 642 bp coding region and ≈340 bp of the 3' untranslated region. They are divided into three exons by two introns which interrupt the coding region. The 5' untranslated spacer contains an unusual sequence of pentamer AGAGG repeated seven times. The inbred maize line (Missouri 17) contains a single gene for GST I, whereas the hybrid line (3780A) contains two genes. Nucleotide sequence analysis of the primer extended cDNA products reveals that the 5' untranslated regions of the two genes in the hybrid 3780A are identical except for a 6 bp internal deletion (or insertion). The amino acid sequence of maize GST I shares no apparent sequence homology with the published sequences of animal GST's and represents the first published sequence of a plant GST. re]19850813 ac]19851126.

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