Structural study of a small molecule receptor bound to dimethyllysine in lysozyme† †Electronic supplementary information (ESI) available: Fig. S1: crystals of the lysozyme-KMe2:sclx4 complex grown at different sclx4 concentrations. Fig. S2: crystals of the complex grown in the presence of chloride- and sulfate-containing salts. Fig. S3: 1D 1H NMR spectra of lysozyme-KMe2 in buffer and DMSO mixtures. Table S1: summary of crystallization conditions, data collection and refinement statistics. Movie S1: MD simulation snapshots of sclx4 binding to Lys116-Me2. See DOI: 10.1039/c4sc02383h Click here for additional data file. Click here for additional data file.

نویسندگان

  • Róise E. McGovern
  • Brendan D. Snarr
  • Joseph A. Lyons
  • James McFarlane
  • Amanda L. Whiting
  • Irina Paci
  • Fraser Hof
  • Peter B. Crowley
چکیده

Lysine is a ubiquitous residue on protein surfaces. Post translational modifications of lysine, including methylation to the mono-, di- or trimethylated amine result in chemical and structural alterations that have major consequences for protein interactions and signalling pathways. Small molecules that bind to methylated lysines are potential tools to modify such pathways. To make progress in this direction, detailed structural data of ligands in complex with methylated lysine is required. Here, we report a crystal structure of p-sulfonatocalix[4]arene (sclx4) bound to methylated lysozyme in which the lysine residues were chemically modified from Lys-NH3+ to Lys-NH(Me2)+. Of the six possible dimethyllysine sites, sclx4 selected Lys116-Me2 and the dimethylamino substituent was deeply buried in the calixarene cavity. This complex confirms the tendency for Lys-Me2 residues to form cation-π interactions, which have been shown to be important in protein recognition of histone tails bearing methylated lysines. Supporting data from NMR spectroscopy and MD simulations confirm the selectivity for Lys116-Me2 in solution. The structure presented here may serve as a stepping stone to the development of new biochemical reagents that target methylated lysines.

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Structural study of a small molecule receptor bound to dimethyllysine in lysozyme

School of Chemistry, National University of Ireland. E-mail: [email protected] Department of Chemistry, University of Vict School of Biochemistry and Immunology, T † Electronic supplementary information lysozyme-KMe2:sclx4 complex grown at d crystals of the complex grown in sulfate-containing salts. Fig. S3: 1D H N and DMSO mixtures. Table S1: summa collection and renement statistics....

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Development of a cyclometalated iridium complex with specific intramolecular hydrogen-bonding that acts as a fluorescent marker for the endoplasmic reticulum and causes photoinduced cell death† †Electronic supplementary information (ESI) available: Detailed synthesis; photophysical data (Table S1); pH dependent phosphorescence lifetime of complex C2 (Table S2); crystallographic parameters of C2; selected bond distances and angles of C2 (Table S3); cyclic voltammetric data of complexes C1–C11 (Table S4); 1H NMR spectra of ligands and complexes (Fig. S1 and S3); ESI-MS spectra of ligands and complexes (Fig. S2 and S4); fluorescence spectra of the complexes in acetonitrile and at pH 4, 7 and 9, exponential decay curve of C2 (Fig. S5); pH dependent fluorescence spectrum of complexes C1–C11 (Fig. S6); DIC and confocal fluorescence images of live MCF7 cells not treated with C2 but exposed to photoirradiation at 405 nm for 30 min; the cells were treated with DCFDA and fluorescence images were obtained at 529 nm after excitation at 495 nm (Fig. S7). ESI videos 1 and 2. CCDC 967841. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c4dt00845f Click here for additional data file. Click here for additional data file. Click here for additional data file. Click here for additional data file. Click here for additional data file.

Cyclometalated iridium complexes have important applications as phosphorescent probes for cellular imaging due to their photophysical properties. Moreover, these properties also make them potential candidates as photosensitizers for photodynamic therapy (PDT) of tumors and skin diseases. Treatment of MCF7 breast carcinoma cells with a heteroleptic phosphorescent cyclometalated iridium(III) comp...

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عنوان ژورنال:

دوره 6  شماره 

صفحات  -

تاریخ انتشار 2015