The S473 antibody

The S473 antibody Ruxolitinib clinical trial was purified by peptide agarose affinity column chromatography. Rabbit anti H3K9diMe and H3K4diMe antibodies were obtained from Upstate Millipore, cyclin A and cyclin B antibodies were from BD Science, and M2 monoclonal antibody and M2 beads were from Sigma. Plasmids and chemicals Mouse Inhibitors,Modulators,Libraries pCMV FLAG TIF1 was cloned as described by Chang et al. Site directed mutagenesis was per formed using pCMV FLAG TIF1 to create S473A and S473E mutants with PfuTurbo DNA Polymerase. The primers, based on nucleotides 1691 to 1721 of NM 005762, were designed as follows. For S473A HA PKC was obtained from Dr. C. K. Chou, HA HP1 and GST HP1 plasmids were kindly provided by Dr. Pierre Chambon. PKC inhibitor Ro 31 8820 and calcium calmodulin dependent protein kinase II inhib itor KN 93 were from BIOMOL.

Inhibitors,Modulators,Libraries Casein kinase1 inhibitor D4476 was from Calbiochem. Staurosporin, 12 O tetradecanoylphorbol 13 acetate, thymidine, and nocodazole were from Sigma. Ser473 specific inhibi tory peptide SGVKRARAGEGEVrrrrrrrrr was obtained from Genemed Synthesis. Cell cultures HeLa, HEK293, and HEK293T cells were cultured in Dul beccos modified Eagles medium plus 10% Inhibitors,Modulators,Libraries FCS and 100 units ml penicillin streptomycin. Inhibitors,Modulators,Libraries For synchronization at mitotic phase, HeLa cells were treated with 1 M nocoda zole for 16 hours. Cells were collected by shake off, rinsed with PBS and cultured in complete medium. For synchro nization at G1 S phase, HeLa cells were treated with 2. 5 mM thymidine for 19 hours, released for 10 hours, treated for 19 hours again before release at various time points for cell cycle progression.

For G1 phase synchronization, Inhibitors,Modulators,Libraries HeLa cells were serum starved for 72 hours and then cul tured in complete medium for various times. K562 cells were maintained in RPMI 1640 with 10% FCS and 100 units penicillin streptomycin. K562 cells were induced to differentiate by treating with TPA for 4 days. Whole cell extracts were prepared by treating the cells with lysis buffer Methionine labeled FLAG TIF1 s and HA HP1 were prepared by TnT in vitro transcription transla tion kit. Chromatin immunoprecipitation assays Chromatin immunoprecipitation assays were per formed as described by Li et al. Briefly, synchronized G1, G1 S, early S phase, or interphase cells were treated with 1. 42% of formaldehyde for 10 min at room temper ature. Nuclei from 1 107 cells were resuspended in ChIP lysis buffer and used for each immunoprecipitation.

After sonication on ice four to six times for 10 seconds followed by centrifugation for 10 min, the chromatin solution was diluted 10 fold with dilution buffer. An input control of 100 l of sonicated solution was saved and processed in parallel with the eluted immunoprecip itates beginning at the cross link reversal step. The chro matin was pre cleaned with protein G agarose. Different antibodies were bound to protein G agarose first in dilution buffer containing 5 g ml of salmon sperm DNA and 5 mg ml BSA.

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