The primary objective of this proposal is to gain insight into functions of Yb-SC proteins in intracellular steroid and carcinogen binding mechanisms. The studies are based on our initial observations that these proteins, that were originally categorized as a subclass of glutathione-S-transferases, exhibit select high affinity binding capacity for steroids and certain polycyclic aromatic hydrocarbons, and may be converted to DNA binding forms by a temperature dependent release of bound GSH. The Yb-SC proteins therefore represent high affinity high capacity binding components in many mammalian tissues that have the potential to govern accessibility of steroids for interaction with receptors and other cellular macromolecules. Molecular mechanisms of interaction of steroid hormones and polycyclic aromatic hydrocarbons, will be analyzed with homogenous preparations of Yb-SC. Spectroscopic, kinetic and equilibrium binding methods will be developed for rapid and reliable screening of compounds that interact with these proteins in vitro, in cell extracts, and in vivo, to determine specificity, affinity, as well as structural requirements for binding of these substances. Structural aspects of the proteins will be probed especially with regard to the two distinct binding domains; a primary site involved in binding of glucocorticoids, progestins and androgens and a secondary region for binding of estrogens and anti-estrogens which is also the catalytic site. Nuclear forms of Yb-SC will be studied in the context of the transport of steroids and carcinogens to the nucleus. The proteins will be studied in cell culture systems with several different cell lines and steroid or carcinogen resistant variants of these, to explore possible functions of Yb-SC in steroid hormone action and metabolism. Tissue specificity, sex differences and factors that regulate synthesis and levels of Yb-SC will be analyzed and these will be correlated to known biological responses elicited by steroids, """"""""anti-steroids"""""""" and chemical carcinogens.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
1R01CA042448-01
Application #
3183778
Study Section
Chemical Pathology Study Section (CPA)
Project Start
1986-04-01
Project End
1989-03-31
Budget Start
1986-04-01
Budget End
1987-03-31
Support Year
1
Fiscal Year
1986
Total Cost
Indirect Cost
Name
Albert Einstein College of Medicine
Department
Type
Schools of Medicine
DUNS #
009095365
City
Bronx
State
NY
Country
United States
Zip Code
10461
Patskovsky, Yury; Patskovska, Larysa; Almo, Steven C et al. (2006) Transition state model and mechanism of nucleophilic aromatic substitution reactions catalyzed by human glutathione S-transferase M1a-1a. Biochemistry 45:3852-62
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Tchaikovskaya, Tatyana; Fraifeld, Vadim; Urphanishvili, Tinatin et al. (2005) Glutathione S-transferase hGSTM3 and ageing-associated neurodegeneration: relationship to Alzheimer's disease. Mech Ageing Dev 126:309-15
Chico, Diane E; Listowsky, Irving (2005) Diverse expression profiles of glutathione-S-transferase subunits in mammalian urinary bladders. Arch Biochem Biophys 435:56-64
Andorfer, John H; Tchaikovskaya, Tatyana; Listowsky, Irving (2004) Selective expression of glutathione S-transferase genes in the murine gastrointestinal tract in response to dietary organosulfur compounds. Carcinogenesis 25:359-67
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
Patskovsky, Y V; Patskovska, L N; Listowsky, I (2000) The enhanced affinity for thiolate anion and activation of enzyme-bound glutathione is governed by an arginine residue of human Mu class glutathione S-transferases. J Biol Chem 275:3296-304
Patskovsky, Y V; Huang, M Q; Takayama, T et al. (1999) Distinctive structure of the human GSTM3 gene-inverted orientation relative to the mu class glutathione transferase gene cluster. Arch Biochem Biophys 361:85-93
Patskovsky, Y V; Patskovska, L N; Listowsky, I (1999) Functions of His107 in the catalytic mechanism of human glutathione S-transferase hGSTM1a-1a. Biochemistry 38:1193-202
Patskovsky, Y V; Patskovska, L N; Listowsky, I (1999) An asparagine-phenylalanine substitution accounts for catalytic differences between hGSTM3-3 and other human class mu glutathione S-transferases. Biochemistry 38:16187-94

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