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• W2165699712 abstract "Abstract The heterodimer HIF‐1α (hypoxia inducible factor)/HIF‐β (also known as ARNT‐aryl hydrocarbon nuclear translocator) is a key mediator of cellular response to hypoxia. The interaction between these monomer units can be modified by the action of small molecules in the binding interface between their C‐terminal heterodimerization (PasB) domains. Taking advantage of the presence of several cysteine residues located in the allosteric cavity of HIF‐1α PasB domain, we applied a cysteine‐based reactomics “hotspot identification” strategy to locate regions of HIF‐1α PasB domain critical for its interaction with ARNT. COMPOUND 5 was identified using a mass spectrometry‐based primary screening strategy and was shown to react specifically with Cys255 of the HIF‐1α PasB domain. Biophysical characterization of the interaction between PasB domains of HIF‐1α and ARNT revealed that covalent binding of COMPOUND 5 to Cys255 reduced binding affinity between HIF‐1α and ARNT PasB domains approximately 10‐fold. Detailed NMR structural analysis of HIF‐1α‐PasB‐COMPOUND 5 conjugate showed significant local conformation changes in the HIF‐1α associated with key residues involved in the HIF‐1α/ARNT PasB domain interaction as revealed by the crystal structure of the HIF‐1α/ARNT PasB heterodimer. Our screening strategy could be applied to other targets to identify pockets surrounding reactive cysteines suitable for development of small molecule modulators of protein function." @default.
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• W2165699712 date "2012-11-09" @default.
• W2165699712 modified "2023-10-15" @default.
• W2165699712 title "Identification of Cys255 in HIF-1α as a novel site for development of covalent inhibitors of HIF-1α/ARNT PasB domain protein-protein interaction" @default.
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• W2165699712 doi "https://doi.org/10.1002/pro.2172" @default.
• W2165699712 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3575918" @default.
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