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note
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Different octamer-dependent reporter constructs (wild-type and mutant versions of 4xwt.TATA and ED.TATA) were used for transient transfections of Jurkat cells (4). CMV lacZ was cotransfected to control for differences in transfection efficiencies. Immediately after transfection, cells were split into different dishes and induced with PMA (10 ng/ml), ionomycin (1 μg/ml), CsA (100 ng/ml), or FK 506 (1 ng/ml). Extracts for enzyme assays were prepared 18 hours after transfection.
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21
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1842320576
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note
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Total cytoplasmic RNA (10 μg) was analyzed as described (24). For protein immunoblots, 100 μg of whole-cell extracts were run on 12.5% SDS-polyacrylamide gels, transferred to polyvinylidene difluoride membranes, and probed with affinity-purified antibodies to BOB. 1/OBF. 1. Blots were developed with the ECL-system (Amersham) (8). When NIH/3T3 cells were analyzed, no increased BOB.1/OBF.1 RNA or protein expression was observed after PMA and ionomycin stimulation. Anisomycin (100 μM) and FK506 (1 ng/ml) inhibited the increase of BOB. 1/ OBF.1 RNA and protein expression.
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22
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1842314820
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note
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Stable transfectants of Jurkat cells were generated with the two components of the tet-regulated system (25).
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23
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1842304327
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note
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BOB.1/OBF.1 was immunoprecipitated from B cell extracts or induced Jurkat T cell extracts, and precipitates were treated with calf intestinal alkaline phosphatase or λ phosphatase. Efficient dephosphorylation was confirmed by including an in vitro phosphorylated protein in some of the samples. Subsequent analysis of the dephosphorylated immunoprecipitates did not show a decrease in the 35-kD band or an increase in the 34-kD band.
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24
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1842347482
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note
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All COOH terminally deleted and point-mutated fragments of BOB.1/OBF.1 used for GAL fusion and GST fusion experiments were generated by polymerase chain reaction (PCR) amplification followed by sequence analysis. Details on the primers used are available upon request. The different subfragments were cloned in frame into either the expression vectors containing the DNA-binding domain of the GAL4 protein (amino acids 1 to 92) (26) or the GST gene in the pGEX-3X (Pharmacia) vector. GST fusion proteins were expressed in bacteria and purified by glutathione sepharose chromatography.
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26
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1842341668
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note
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32P]orthophosphate (1 mCi/ml) in a total of 10 ml of medium containing dialyzed fetal bovine serum. BOB.1/OBF.1 protein was immunoprecipitated from whole-cell extracts with the use of affinity-purified antibodies (8) and separated on 12% SDS-polyacrylamide gels. Wet gels were autoradiographed, and BOB.1/OBF.1 was excised and eluted from the gel. After cleavage with 100 ng of V8 protease (Glu-C endopeptidase, Boehringer Mannheim) for 15 hours at 30°C, phosphopeptides were separated on cellulose plates by electrophoresis at pH 1.9 followed by chromatography (21). Phospho-amino acid analysis was performed as described (21) for in vivo-labeled proteins, and only phosphoserine and phosphothreonine were identified.
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27
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1842360192
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note
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32P]ATP for 30 min at 30°C in a total volume of 40 μl. Subsequently, the fusion protein was purified by affinity chromatography using glutathione agarose beads. Proteins were dissociated from the resin by boiling in SDS sample buffer and then were subjected to 12% SDS-polyacrylamide gel electrophoresis.
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0029118199
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1842274553
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note
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We thank Sandoz Pharma and Fujisawa Pharma for the gift of CsA and FK506, respectively. We also thank R. Röder for typing the manuscript and S. Pfränger for preparing the figures. Supported by grants from the Deutsche Forschungsgemeinschaft to T.W. (SFB 229 and SFB 465) and P.A. (An 182/7-1) and by Boehringer Ingelheim.
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