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M63?minimal medium supplemented with 0.2% glucose, 0.5?mM L-amino acids, 1?mM MgSO4, was used for SILAC labeling, unless otherwise stated. To prepare L, M, and H media, the respective amino acids were added, for L: Arg0 and Lys0 (arginine and lysine, Sigma), for M: Arg6 [http://www.selleckchem.com/products/pfi-2.html Selleck PFI-2] and Lys4 (arginine-13C6 and lysine-4,4,5,5-d4, Cambridge Isotope Laboratories), for H: Arg10 and Lys8 (arginine-13C6,15N4 and lysine-13C6,15N2, Cambridge Isotope Laboratories). E.?coli cells in exponential phase were grown at 37��C in 0.5 l SILAC medium to OD600nm ?1. Spheroplasts were prepared at 4��C as previously described ( Ewalt et?al., 1997), resuspended in 3?ml SILAC medium supplemented with 0.25?M sucrose, 0.2% glycerol and incubated at 37��C for 15?min. Lysis was rapidly induced by dilution of the spheroplasts into an equal volume of 25��C hypo-osmotic lysis buffer (20?mM Tris-HCl pH 8, 0.2% (v/v) Triton X-100, 20?mM MgCl2, 25?U/ml benzonase, 2x EDTA-free protease inhibitor cocktail (Roche), 100?U/ml apyrase (Sigma)) and was allowed to proceed for 1?min at RT. Apyrase treatment was effective in?[https://en.wikipedia.org/wiki/Flupentixol flupentixol] 4��C. The lysate was cleared at 20,000 x g for 30?min (an aliquot of the supernatant was saved for LC-MS/MS of the soluble proteome) and the supernatant incubated for 60?min with Talon resin (1?��l/mg total protein determined by Bradford assay) (Clontech) pre-equilibrated in buffer A (50?mM Tris-HCl pH 8, 300?mM NaCl, 20?mM MgCl2, 50?mM KCl) for isolation by IMAC. The resin was washed sequentially with buffer A and buffer A/10?mM imidazole (200 column volumes each). DnaK-interactor complexes were eluted with 0.25?ml buffer A/100?mM imidazole. The eluted sample was then diluted 1:10 in buffer A and the isolation with Talon resin repeated. [http://www.selleckchem.com/products/ipi-145-ink1197.html Duvelisib order] DnaK-interactor complexes were finally eluted from the beads with an equal volume of LDS sample buffer (Invitrogen) by heating at 70��C for 10?min. Eluates obtained from equal amounts of differentially labeled cells were mixed at a 1:1 (v:v) ratio and separated on NuPAGE gradient gels (4?12%). Gels were fixed and stained with Colloidal Blue (Invitrogen). Preparation of gel slices, reduction, alkylation, and in-gel protein digestion was carried out as described ( Ong and Mann, 2006). Finally, peptides were desalted, filtered, and enriched on OMIX-C18 tips (Varian). E.?coli MC4100 dnaK-His6 (KHis) and different chaperone mutant strains (��T/KHis, ��KJ, ��KJT, LS?/KHis) were grown at 30��C or 37��C, as indicated, in 50?ml of the respective SILAC medium to OD600nm ?1. After centrifugation cells were resuspended with 2?ml buffer B (20?mM Tris pH 7.5, 50?mM NaCl, 1x EDTA-free protease inhibitor cocktail) and flash frozen in liquid nitrogen. The cells were thawed and sonicated (Sonicator 3000, Misonix) on ice for eight pulses of 15?s with 1?min interval. The lysate was cleared by low speed centrifugation (2000 x g, 10?min) to remove cell debris.