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Synthesis of isomeric analogues of S-ribosylhomocysteine analogues with homocysteine unit attached to C2 of ribose.
Bioorganic & Medicinal Chemistry Letters 2017 April 16
LuxS (S-ribosylhomocysteinase; EC 4.4.1.21) is an enzyme that catalyzes the cleavage of the thioether linkage in the catalytic pathway of S-ribosylhomocysteine (SRH) which produces homocysteine and 4,5-dihydroxy-2,3-pentanedione (DPD). DPD is the precursor of the signaling molecules known as autoinducer 2 (AI-2) responsible for the bacterial quorum sensing (QS) identified as cell to cell communication. Inhibitors of LuxS should be able to interfere with its catalytic pathway thus preventing the formation of the autoinducer molecules. In this work, the synthesis of 2-deoxy-2-bromo-SRH analogues was attempted by the coupling of the corresponding 2-bromo-2-deoxypentafuranosyl sugars with the homocysteinate anion. The displacement of the bromide from C2 rather than the expected substitution of the mesylate group from C5 was observed leading to a novel isomeric analogue of SRH in which Hcy moiety is attached to a ribose ring via C2-sulfur bond.
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