The proposed research involves synthesis of a number of enzyme inhibitors, evaluation of their binding behavior, and correlation of this binding behavior with turnover of related substrates. Our intention is to develop effective strategies for the design of biologically active molecules and to provide insight into the relationship between inhibitor binding and enzyme mechanism. The inhibitors that are developed during the course of this work should be of medicinal importance in the areas of antitumor therapy, hypertension, and analgesia. The key elements to the program are the following: A. Cytidine Deaminase: The stereoselectivity of phosphapyrimidine inhibitors will be evaluated, whether they are transition state analogs will be determined, and the relationship between their slow-binding behavior and protein conformational changes will be examined. B. Zinc Peptidases: The correlation between phosphonamidate and transition state binding will be extended, the mechanism of slow-binding for these inhibitors will be elucidated, thermolysin and carboxypeptidase A will be compared in this respect, and a new class of phosphonamide inhibitors will be explored. C. Aspartic Peptidases: The nature of inhibition by a phosphorous-containing pepstatin analog will be elucidated, an explanation for its slow, two-step binding behavior will be sought, and phosphinamides and phosphonic acid inhibitors will be developed as more accurate transition state analogs for this class of peptidases. D. Glutamine-Dependent Amidotransferases: A general strategy for the inhibition of these enzymes will be developed and applied to the synthesis of multisubstrate analogs for carbamyl phosphate synthetase and phosphoribosyl pyrophosphate amidotransferase. E. Adenosine Deaminase: The phosphinate and phosphinamide analogs of coformycin will be synthesized as better mimics of the tetrahedral intermediate, their inhibition and slow-binding will be analyzed in relation to enzyme conformational changes. F. Sulfoxides as Inhibitors of Dehydrases: A program on suicide inhibitors based on enzyme-induced Pummerer-type reactions will be initiated (enzymes addressed: carnitine acetyltransferase, Beta-hydroxydecanoyl thiolester dehydrase, and mevalonate pyrophosphate decarboxylase).

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
2R01CA022747-09
Application #
3165889
Study Section
Biochemistry Study Section (BIO)
Project Start
1978-04-01
Project End
1991-03-31
Budget Start
1986-04-01
Budget End
1987-03-31
Support Year
9
Fiscal Year
1986
Total Cost
Indirect Cost
Name
University of California Berkeley
Department
Type
Schools of Arts and Sciences
DUNS #
094878337
City
Berkeley
State
CA
Country
United States
Zip Code
94704
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Fraser, M E; Strynadka, N C; Bartlett, P A et al. (1992) Crystallographic analysis of transition-state mimics bound to penicillopepsin: phosphorus-containing peptide analogues. Biochemistry 31:5201-14
Phillips, M A; Kaplan, A P; Rutter, W J et al. (1992) Transition-state characterization: a new approach combining inhibitor analogues and variation in enzyme structure. Biochemistry 31:959-63
Sampson, N S; Bartlett, P A (1991) Peptidic phosphonylating agents as irreversible inhibitors of serine proteases and models of the tetrahedral intermediates. Biochemistry 30:2255-63
Kaplan, A P; Bartlett, P A (1991) Synthesis and evaluation of an inhibitor of carboxypeptidase A with a Ki value in the femtomolar range. Biochemistry 30:8165-70
Copie, V; Kolbert, A C; Drewry, D H et al. (1990) Inhibition of thermolysin by phosphonamidate transition-state analogues: measurement of 31P-15N bond lengths and chemical shifts in two enzyme-inhibitor complexes by solid-state nuclear magnetic resonance. Biochemistry 29:9176-84
Hanson, J E; Kaplan, A P; Bartlett, P A (1989) Phosphonate analogues of carboxypeptidase A substrates are potent transition-state analogue inhibitors. Biochemistry 28:6294-305
Giannousis, P P; Bartlett, P A (1987) Phosphorus amino acid analogues as inhibitors of leucine aminopeptidase. J Med Chem 30:1603-9
Bartlett, P A; Marlowe, C K; Giannousis, P P et al. (1987) Phosphorus-containing peptide analogs as peptidase inhibitors. Cold Spring Harb Symp Quant Biol 52:83-90
Mookhtiar, K A; Marlowe, C K; Bartlett, P A et al. (1987) Phosphonamidate inhibitors of human neutrophil collagenase. Biochemistry 26:1962-5

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