530115-96-9Relevant articles and documents
Protein Modification at Tyrosine with Iminoxyl Radicals
Ishiyama, Takashi,Kanai, Motomu,Maruyama, Katsuya,Oisaki, Kounosuke,Sakai, Kentaro,Seki, Yohei,Togo, Takaya
supporting information, p. 19844 - 19855 (2021/11/30)
Post-translational modifications (PTMs) of proteins are a biological mechanism for reversibly controlling protein function. Synthetic protein modifications (SPMs) at specific canonical amino acids can mimic PTMs. However, reversible SPMs at hydrophobic amino acid residues in proteins are especially limited. Here, we report a tyrosine (Tyr)-selective SPM utilizing persistent iminoxyl radicals, which are readily generated from sterically hindered oximes via single-electron oxidation. The reactivity of iminoxyl radicals with Tyr was dependent on the steric and electronic demands of oximes; isopropyl methyl piperidinium oxime 1f formed stable adducts, whereas the reaction of tert-butyl methyl piperidinium oxime 1o was reversible. The difference in reversibility between 1f and 1o, differentiated only by one methyl group, is due to the stability of iminoxyl radicals, which is partly dictated by the bond dissociation energy of oxime O-H groups. The Tyr-selective modifications with 1f and 1o proceeded under physiologically relevant, mild conditions. Specifically, the stable Tyr-modification with 1f introduced functional small molecules, including an azobenzene photoswitch, to proteins. Moreover, masking critical Tyr residues by SPM with 1o, and subsequent deconjugation triggered by the treatment with a thiol, enabled on-demand control of protein functions. We applied this reversible Tyr modification with 1o to alter an enzymatic activity and the binding affinity of a monoclonal antibody with an antigen upon modification/deconjugation. The on-demand ON/OFF switch of protein functions through Tyr-selective and reversible covalent-bond formation will provide unique opportunities in biological research and therapeutics.
2,5-DISUBSTITUTED 3-METHYL PYRAZINES AND 2,5,6-TRISUBSTITUTED 3-METHYL PYRAZINES AS ALLOSTERIC SHP2 INHIBITORS
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Paragraph 0400, (2018/03/26)
The present disclosure is directed to inhibitors of SHP2 and their use in the treatment of disease. Also disclosed are pharmaceutical compositions comprising the same.
INDUCTION OF GATA2 BY HDAC1 AND HDAC2 INHIBITORS
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Page/Page column 73; 74, (2016/05/02)
Provided herein are compounds, pharmaceutical compositions comprising such compounds, and methods of using such compounds to treat diseases or disorders associated with Gata2 deficiency, particularly diseases or disorders that involve any type of HDAC1 and/or HDAC2 expression. Such diseases include acute myeloid leukemia (AML); familial myelodysplastic syndrome (MDS); leukemia; sickle-cell anemia; beta-thalassemia; monocytopenia and mycobacterial infections; dendritic cell, nonocyte, B, and natural killer lymphoid deficiency; Emberger syndrome; asymptomatic neurocognitive impairment; mild neurocognitive disorder; and HIV- associated dementia.