Enzymes which utilize a nicotinamide adenine dinucleotide (NAD) as a catalyst rather than a cosubstrate constitute a unique subset of NAD- requiring enzymes. Two premier examples of this class of enzyme include 3-dehydroquintate (DHQ) synthase and myo-inositol 1-phosphate (MIP) synthase. Proposed research entails the use of mechanism-based enzymology and chemical synthesis as tools to create potent chemical inhibitors of these NAD-dependent synthases. New strategies to be developed for inhibition of DHQ synthase will serve as paradigms for parallel efforts directed at MIP synthase inhibition. The myo-inositol 1-phosphate generated by MIP synthase in brain tissue is an important source of myo-inositol for the human brain due to the brain's extremely limited access to dietary myo-inositol. Inhibition of brain-localized MIP synthase would thus reduce myo-inositol concentrations in brain tissue and may provide an alternate approach for treating manic disorders. This follows from evidence that control of manic depression with Li+ treatment is the result of reduced concentrations of myo-inositol in brain tissue. While achieving efficient translocation of inhibitors into the brain must remain a long term goal, elaboration of the strategies by which these molecules will inhibit MIP synthase can begin with this research effort.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM047011-04
Application #
2184478
Study Section
Bio-Organic and Natural Products Chemistry Study Section (BNP)
Project Start
1992-08-01
Project End
1996-07-31
Budget Start
1994-08-01
Budget End
1995-07-31
Support Year
4
Fiscal Year
1994
Total Cost
Indirect Cost
Name
Michigan State University
Department
Chemistry
Type
Schools of Arts and Sciences
DUNS #
193247145
City
East Lansing
State
MI
Country
United States
Zip Code
48824