A Laboratory Guide to In Vitro Studies of Protein-DNA by J. P. J., H. P. S. (auth.), Dr. Jean-Pierre Jost, Dr. PDF

By J. P. J., H. P. S. (auth.), Dr. Jean-Pierre Jost, Dr. Hans-Peter Saluz (eds.)

ISBN-10: 3034875614

ISBN-13: 9783034875615

ISBN-10: 3764326271

ISBN-13: 9783764326272

A protection concerns Many options defined right here contain a couple of risks, resembling excessive electric present and voltage, radioactivity and hugely poisonous chemical substances. it truly is totally crucial that the directions of kit brands be undefined, and that individual awareness be paid to the neighborhood and federal security rules. B advent The expression of prokaryotic and eukaryotic genes has been proven often to be regulated on the point of mRNA synthesis. because of the swift improvement of tools for dissecting DNA sequences, cis-acting regulatory parts corresponding to promoters and enhancers were acknowledged. extra lately, the commonly expressed instinct that discrete sequences inside of those components represent binding websites for sequence-specific binding proteins has been proven, particularly by using "footprinting" assays (for examples, Galas and Schmitz, 1978). This and related assays have already ended in the popularity, isolation and research of DNA-bind­ ing proteins for a number of genes. first-class reports exist of the structural reviews on those transcription regulatory proteins and similar DNA components (for instance, Glover, 1989 and Johnson and McKnight, 1989), to which the reader is referred for special details. To set the scene for functions of the concepts defined during this quantity, purely the barest define of prior stories is gifted right here. Protein-DNA interactions are depending on very particular tertiary configurations of the binding protein which enable the nearest touch with the DNA helix.

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Extra info for A Laboratory Guide to In Vitro Studies of Protein-DNA Interactions

Example text

1 Labelling and purification of the oligonucleotide 2 The protein-DNA binding reaction 36 36 38 B Materials and methods . . . . I Buffers and enzyme . . . . 2 Step-by-step procedure for assembling the binding reaction 3 The exonuclease III reaction . . . . . . . 38 38 39 39 C Separation of the reaction product on nitrocellulose filters 1 Step-by-step procedure for the nitrocellulose filter binding assay 2 DNA size standards . . . . . . . . . . 3 Separation of the reaction product on a sequencing gel 39 40 40 40 D An Example .

For this reason it is not advisable to substitute a high salt, crude cellular extract for the nuclear extracts (Wu, 1985). Since the exonuclease III reaction must be carried out in the presence of 1-5 mM MgCb, it is necessary first to test first by gel-shift assay the effect of MgCIz on the formation of the protein-DNA complex and on the nonspecific degradation of labelled DNA by contaminating nucleases in the extract. At the end of the reaction the exonuclease III activity is blocked by means of EDTA and SDS, if the free and bound DNA are to be extracted together, or by EDTA alone, if the free and bound DNA must be extracted separately.

Chill in an ethanol-dry ice bath as before to precipitate the DNA. Then repeat the spin, rinse, and dry steps as described above. Deamination Reaction > Resuspend purified, ethanol-precipitated DNA pellets in 300 III of deamination buffer. > Incubate the DNA samples in a water bath at 50 C for 5 h D in the dark. > Add 30 III of 3 M NaOAc and 750 III of 95% ethanol to precipitate the DNA. The precipitation is carried out as described above. NaBH4 Reduction Reaction > Resuspend the DNA pellets in 50 III of NaBlf4 reduction buffer.

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A Laboratory Guide to In Vitro Studies of Protein-DNA Interactions by J. P. J., H. P. S. (auth.), Dr. Jean-Pierre Jost, Dr. Hans-Peter Saluz (eds.)


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