Molecular characterization of glyoxalase II from Arabidopsis thaliana

Molecular characterization of glyoxalase II from Arabidopsis thaliana Glyoxalase II is part of the glutathione-dependent glyoxalase detoxification system. In addition to its role in the detoxification of cytotoxic 2-oxo-aldehydes, specifically methylglyoxal, it has been suggested that the glyoxalase system may also play a role in controlling cell differentiation and proliferation. During the analysis of a T-DNA-tagged mutant of Arabidopsis we identified the gene for a glyoxalase II isozyme (GLY1) that appears to be mitochondrially localized. The cDNA encoding a glyoxalase II cytoplasmic isozyme (GLY2) was also isolated and characterized. Southern blot and sequence analyses indicate that glyoxalase II proteins are encoded by at least two multigene families in Arabidopsis. Escherichia coli cells expressing either GLY1 or GLY2 exhibit increased glyoxalase II activity, confirming that they do, in fact, encode glyoxalase II proteins. Northern analysis shows that the two genes are differentially expressed. Transcripts for the mitochondrial isozyme are most abundant in roots, while those for the cytoplasmic isozyme are highest in flower buds. The identification of glyoxalase II isozymes that are differentially expressed suggests that they may play different roles in the cell. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Molecular Biology Springer Journals

Molecular characterization of glyoxalase II from Arabidopsis thaliana

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Publisher
Kluwer Academic Publishers
Copyright
Copyright © 1997 by Kluwer Academic Publishers
Subject
Life Sciences; Biochemistry, general; Plant Sciences; Plant Pathology
ISSN
0167-4412
eISSN
1573-5028
D.O.I.
10.1023/A:1005891123344
Publisher site
See Article on Publisher Site

Abstract

Glyoxalase II is part of the glutathione-dependent glyoxalase detoxification system. In addition to its role in the detoxification of cytotoxic 2-oxo-aldehydes, specifically methylglyoxal, it has been suggested that the glyoxalase system may also play a role in controlling cell differentiation and proliferation. During the analysis of a T-DNA-tagged mutant of Arabidopsis we identified the gene for a glyoxalase II isozyme (GLY1) that appears to be mitochondrially localized. The cDNA encoding a glyoxalase II cytoplasmic isozyme (GLY2) was also isolated and characterized. Southern blot and sequence analyses indicate that glyoxalase II proteins are encoded by at least two multigene families in Arabidopsis. Escherichia coli cells expressing either GLY1 or GLY2 exhibit increased glyoxalase II activity, confirming that they do, in fact, encode glyoxalase II proteins. Northern analysis shows that the two genes are differentially expressed. Transcripts for the mitochondrial isozyme are most abundant in roots, while those for the cytoplasmic isozyme are highest in flower buds. The identification of glyoxalase II isozymes that are differentially expressed suggests that they may play different roles in the cell.

Journal

Plant Molecular BiologySpringer Journals

Published: Sep 30, 2004

References

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