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ID: ALA5149995
Journal: J Med Chem
Title: An Alkynylpyrimidine-Based Covalent Inhibitor That Targets a Unique Cysteine in NF-κB-Inducing Kinase.
Authors: Al-Khawaldeh I, Al Yasiri MJ, Aldred GG, Basmadjian C, Bordoni C, Harnor SJ, Heptinstall AB, Hobson SJ, Jennings CE, Khalifa S, Lebraud H, Martin MP, Miller DC, Shrives HJ, de Souza JV, Stewart HL, Temple M, Thomas HD, Totobenazara J, Tucker JA, Tudhope SJ, Wang LZ, Bronowska AK, Cano C, Endicott JA, Golding BT, Hardcastle IR, Hickson I, Wedge SR, Willmore E, Noble MEM, Waring MJ.
Abstract: NF-κB-inducing kinase (NIK) is a key enzyme in the noncanonical NF-κB pathway, of interest in the treatment of a variety of diseases including cancer. Validation of NIK as a drug target requires potent and selective inhibitors. The protein contains a cysteine residue at position 444 in the back pocket of the active site, unique within the kinome. Analysis of existing inhibitor scaffolds and early structure-activity relationships (SARs) led to the design of C444-targeting covalent inhibitors based on alkynyl heterocycle warheads. Mass spectrometry provided proof of the covalent mechanism, and the SAR was rationalized by computational modeling. Profiling of more potent analogues in tumor cell lines with constitutively activated NIK signaling induced a weak antiproliferative effect, suggesting that kinase inhibition may have limited impact on cancer cell growth. This study shows that alkynyl heterocycles are potential cysteine traps, which may be employed where common Michael acceptors, such as acrylamides, are not tolerated.
CiteXplore: 34212719