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Second Generation Transition State Analogue Inhibitors Of Human 5'-methylthioadenosine Phosphorylase.

G. Evans, R. Furneaux, Dirk H. Lenz, G. Painter, V. Schramm, Vipender Singh, P. Tyler
Published 2005 · Chemistry, Medicine

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The polyamine biosynthetic pathway is a therapeutic target for proliferative diseases because cellular proliferation requires elevated levels of polyamines. A byproduct of the synthesis of spermidine and spermine is 5'-methylthioadenosine (MTA). In humans MTA is processed by 5'-methylthioadenosine phosphorylase (MTAP) so that significant amounts of MTA do not accumulate. Products of the MTAP reaction (adenine and 5-methylthio-alpha-D-ribose-1-phosphate) are recycled to S-adenosylmethionine, the precursor for polyamine synthesis. Potent inhibitors of MTAP might allow the build-up of sufficient levels of MTA to generate feedback inhibition of polyamine biosynthesis and/or reduce S-adenosylmethionine levels. We recently reported the design and synthesis of a family of potent transition state analogue inhibitors of MTAP. We now report the synthesis of a second generation of stable transition state analogues with increased distance between the ribooxocarbenium ion and purine mimics. These compounds are potent inhibitors with equilibrium dissociation constants as low as 10 pM. The first and second generation inhibitors represent synthetic approaches to mimic early and late features of a dissociative transition state.



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