We wish to use a molecular biological approach to study the differential gene expression of the rat glutathione S-transferase isozyme family. We will investigate the multiplicity of the isozyme family in liver, kidney, testis, and lung establish a molecular basis for the apparent tissues specific expression and the differential induction by various xenobiotics. We plan to analyze the gene organization for the various tissue specific isozymes and design specific molecular probes obtained through cDNA and genomic DNA cloning to establish a most probable relationship between glutathione S-transferase gene structures and their regulated expressions. With a combination of hybrid-selected in vitro translation, specific immunoprecipitation and two dimensional gel analyses, we hope to match a GST cDNA structure with a catalytic function. Upon achieving heterospecific expression of rat glutathione S-transferase sequence in E. coli, we can study the catalytic properties of an absolute pure GST which may not be obtainable by conventional biochemical means for this family of highly diversified isozymes. Furthermore, the heterospecific system allows the construction and possible expression of hybrid glutathione S-transferases. This system also allows single amino acaid replacement through site specific mutagenesis at the cDNA plasmid level so that we will understand the functional domains of each isozyme more precisely. The high multiplicity of this isozyme family may reflect a very diversified physiological functions beyond drug biotransformation and xenobiotics metabolism. Understanding the differential gene expression for GST isozymes not only contributes to a better appreciation of tissue differentiation but also to the possible elucidation of some of their new physiological functions. The plant glutathione S-transferases are essential in mediating resistance to various herbicides. The purified genes from the animal origin may be a valuable source of exotic genetic material in plant genetic engineering to expand its range of herbicide resistance and possible improvement of crop yield.

Agency
National Institute of Health (NIH)
Institute
National Institute of Environmental Health Sciences (NIEHS)
Type
Research Project (R01)
Project #
5R01ES002678-07
Application #
3249987
Study Section
Molecular Biology Study Section (MBY)
Project Start
1981-07-01
Project End
1989-06-30
Budget Start
1987-07-01
Budget End
1988-06-30
Support Year
7
Fiscal Year
1987
Total Cost
Indirect Cost
Name
Pennsylvania State University
Department
Type
Schools of Arts and Sciences
DUNS #
City
University Park
State
PA
Country
United States
Zip Code
16802
Akgul, Bunyamin; Tu, Chen-Pei D (2008) mRNA Decay analysis in Drosophila melanogaster drug-induced changes in glutathione S-transferase D21 mRNA stability. Methods Enzymol 448:285-97
Akgul, Bunyamin; Tu, Chen-Pei D (2007) Regulation of mRNA stability through a pentobarbital-responsive element. Arch Biochem Biophys 459:143-50
Tu, Chen-Pei D; Akgul, Bunyamin (2005) Drosophila glutathione S-transferases. Methods Enzymol 401:204-26
Akgul, Bunyamin; Tu, Chen-Pei D (2004) Pentobarbital-mediated regulation of alternative polyadenylation in Drosophila glutathione S-transferase D21 mRNAs. J Biol Chem 279:4027-33
Akgul, Bunyamin; Tu, Chen-Pei D (2002) Evidence for a stabilizer element in the untranslated regions of Drosophila glutathione S-transferase D1 mRNA. J Biol Chem 277:34700-7
Cheng, H; Tchaikovskaya, T; Tu, Y S et al. (2001) Rat glutathione S-transferase M4-4: an isoenzyme with unique structural features including a redox-reactive cysteine-115 residue that forms mixed disulphides with glutathione. Biochem J 356:403-14
Weinander, R; Mosialou, E; DeJong, J et al. (1995) Heterologous expression of rat liver microsomal glutathione transferase in simian COS cells and Escherichia coli. Biochem J 311 ( Pt 3):861-6
DeJong, J L; Mohandas, T; Tu, C P (1991) The human Hb (mu) class glutathione S-transferases are encoded by a dispersed gene family. Biochem Biophys Res Commun 180:15-22
Van Dyke, D C; Roby, J; Tu, C P (1991) New SacI RFLP for human liver glutathione-S-transferase. Nucleic Acids Res 19:199
DeJong, J L; Mohandas, T; Tu, C P (1990) The gene for the microsomal glutathione S-transferase is on human chromosome 12. Genomics 6:379-82

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