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Design and synthesis of inhibitors of dTDP-D-glucose 4,6-dehydrate (Rm1B), and enzyme required for dTDP-L-rhamnose production in M. tuberculosis

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dc.contributor.advisor John M. Essigmann. en_US Kadaba, Neena Sujata, 1981- en_US
dc.contributor.other Massachusetts Institute of Technology. Dept. of Biological Engineering. en_US 2012-09-27T15:24:05Z 2012-09-27T15:24:05Z 2003 en_US 2003 en_US
dc.description Thesis (S.M. in Molecular and Systems Toxicology)--Massachusetts Institute of Technology, Biological Engineering Division, 2003. en_US
dc.description Vita. en_US
dc.description Includes bibliographical references (leaves 60-62). en_US
dc.description.abstract The purpose of this work is to probe the dTDP-L-rhamnose pathway in an effort to develop small molecule inhibitors that could act as therapeutics for Mycobacterium tuberculosis. The necessity for newer, more effective treatments for tuberculosis is growing, as the bacteria evolve resistance to traditional treatments. In an effort to develop more effective and perhaps more abbreviated courses of treatment, a plan was developed to investigate a pathway involved in cell wall biosynthesis as a promising target: the dTDP-L-rhamnose pathway. This pathway plays an essential role in linking the peptidoglycan and arabinogalactan portions of the mycolic acid-arabinogalactan-peptidoglycan complex, a significant part of the mycobacterial cell wall. The mounting level of biochemical understanding of this pathway and its importance in bacterial cell wall biosynthesis indicates that it is not only a relevant target but also an accessible one. Of the four enzymes crucial to this biosynthetic pathway, one was chosen as the primary focus: dTDP-D-glucose-4,6- dehydratase (RmlB). There are 3 steps in the reaction mechanism of RmlB: oxidation of the C4 position of dTDP-D-glucose to form a 4-keto structure, dehydration of the C6 position via the elimination of water and a subsequent reduction to result in a 6-deoxy product. Crystal structures of this particular enzyme, dTDP-D-glucose 4,6-dehydratase (RmlB), complexed with single substrates or substrate analogs have provided a foundation for these studies, enabling the rational design of a small library of potential inhibitors. Twelve mechanism-based inhibitors of RmlB are proposed. These compounds reflect the current understanding of the mechanism and mimic the sugar portion of the sugar-nucleotide substrate at various steps throughout the reaction mechanism. Each of the proposed inhibitors is designed to inhibit one of the specific steps of the mechanism. While the intention of this project is to synthesize each compound in this library from commercially available starting materials in 15 steps or less, the primary goal of this particular dissertation is to synthesize 3 of the 12 proposed inhibitors from the commercially available starting material 1,5-anhydro-D-glucitol. The long term goal of this work is to produce these compounds in significant amounts in order to test their efficacy in an animal model of mycobacterial infection. en_US
dc.description.statementofresponsibility by Neena Sujata Kadaba. en_US
dc.format.extent 101 leaves en_US
dc.language.iso eng en_US
dc.publisher Massachusetts Institute of Technology en_US
dc.rights MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission. en_US
dc.rights.uri en_US
dc.subject Biological Engineering. en_US
dc.title Design and synthesis of inhibitors of dTDP-D-glucose 4,6-dehydrate (Rm1B), and enzyme required for dTDP-L-rhamnose production in M. tuberculosis en_US
dc.type Thesis en_US Molecular and Systems Toxicology en_US
dc.contributor.department Massachusetts Institute of Technology. Dept. of Biological Engineering. en_US
dc.identifier.oclc 53119555 en_US

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