Abstract
A structure-guided fragment-based approach was used to target the lipophilic allosteric binding site of Mycobacterium tuberculosis EthR. This elongated channel has many hydrophobic residues lining the binding site, with few opportunities for hydrogen bonding. We demonstrate that a fragment-based approach involving the inclusion of flexible fragments in the library leads to an efficient exploration of chemical space, that fragment binding can lead to an extension of the cavity, and that fragments are able to identify hydrogen-bonding opportunities in this hydrophobic environment that are not exploited in Nature. In the present paper, we report the identification of a 1 μM affinity ligand obtained by structure-guided fragment linking.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Allosteric Site / physiology*
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Binding Sites / physiology
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Crystallography, X-Ray
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Drug Delivery Systems / methods*
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Drug Discovery / methods*
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Lipids
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Mycobacterium tuberculosis
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Peptide Fragments / antagonists & inhibitors
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Peptide Fragments / physiology*
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Protein Structure, Secondary
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Protein Structure, Tertiary
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Repressor Proteins / antagonists & inhibitors*
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Repressor Proteins / chemistry*
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Repressor Proteins / metabolism
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Structure-Activity Relationship
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Transcription Factors / antagonists & inhibitors*
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Transcription Factors / chemistry*
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Transcription Factors / metabolism
Substances
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EthR protein, Mycobacterium tuberculosis
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Lipids
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Peptide Fragments
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Repressor Proteins
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Transcription Factors