Protocol for steroid radioimmunoassay. Includes: SOLVENT DISTILLATION; PREPARATION OF PLASMA SAMPLES; EXTRACTION OF STEROIDS AND COLUMN PACKING; COLUMN CHROMATOGRAPHY; RADIOIMMUNOASSAY; SEPARATION OF BOUND AND FREE COUNTS; DIRECT ASSAYS; SHORT COLUMN CHROMATOGRAPHY. - [Read Steroid Radioimmunoassay Protocol]
Small ubiquitin-like modifier (SUMO) is a small molecule, but has a variety of regulatory functions in cells. SUMO modification is involved in transcriptional regulation, subcellular localization, and protein-protein interactions. SUMO conjugation requires sequential E1-dependent activation, E2-dependent conjugation, and E3-dependent ligation steps. Protocol includes: In vivo and in vitro SUMOylation assay and deSUMOylation assay. - [Read Sumoylation and Desumoylation Assays for a Chromatin-Remodelling Complex In Vivo and In Vitro]
A protein precipitation procedure used to precipitate protein from cell
lysates. Allows for optimal protein recovery and accurate assays. The Signaling Gateway - [Read TCA/Acetone Precipitation (Large Scale) PDF]
Transfection of primary leukocytes has traditionally been a challenging but much desired protocol. It allows not only the analysis of cells in a more natural state to a cell line system, it enables the direct comparison of, for e.g. transcriptional activity using luciferase reporters, in immune cells taken from genetically-altered mice. In addition, importantly it allows for "rescue experiments" in knockout cells & the ability to over-express or reconstitute wild-type and/or mutated constructs. - [Read Transfection of Bone Marrow-Derived Mast Cells for Transcription Factor Luciferase Reporter Assays]
The study of transient gene expression provides a useful complement to the study of stably transformed plants. Transient assays offer a quick method of testing the effects of genes, using either phenotypic, molecular, or biochemical readouts. Transient assays based on Agrobacterium-mediated transformation of leaf explants have been described for other plant species, but it is not known how well these assays work in Arabidopsis. - [Read Transient Expression in Protoplasts]
Protocol describes the preparation of Cytostatic Factor (CSF) from frog eggs. CSF can be used in in vitro spindle assembly assays. Includes: Frog injections; Preparation Before Starting the Extract Preparation; Extract Preparation. - [Read Xenopus Egg CSF Extract Preparation Protocol]