Western blot: 1-10 μg/mL for chemiluminescence detection system.
Protocol
SDS-PAGE & Western Blotting 1) Wash the cells 3 times with PBS and suspend with 10 volumes of cold Lysis buffer (50 mM Tris-HCl, pH 7.2, 250 mM NaCl, 0.1 % NP-40, 2 mM EDTA, 10 % glycerol) containing appropriate protease inhibitors. Incubate it at 4 o C with rotating for 30 minutes, then sonicate briefly (up to 10 seconds). 2) Centrifuge the tube at 12,000 x g for 10 minutes at 4 o C and transfer the supernatant to another tube. Measure the protein concentration of the supernatant and add the Lysis buffer to make an 8 mg/mL solution. 3) Mix the sample with an equal volume of Laemmli's sample buffer. 4) Boil the samples for 2 minutes and centrifuge. Load 10 μ L of the sample per lane in a 1 mm thick SDS-polyacrylamide gel for electrophoresis. 5) Blot the protein to a polyvinylidene difluoride (PVDF) membrane at 1 mA/cm 2 for 1 hour in a semi-dry transfer system. (Transfer Buffer: 25 mM Tris, 190 mM glycine, 20 % MeOH). See the manufacture's manual for precise transfer procedure. 6) To reduce nonspecific binding, soak the membrane in 10 % skimmed milk (in PBS, pH 7.2) for 1 hour at room temperature, or overnight at 4 °C. 7) Incubate the membrane with primary antibody diluted with PBS, pH 7.2 containing 1 % skimmed milk as suggested in the APPLICATIONS for 1 hour at room temperature. (The optimal antibody concentration will depend on the experimental conditions.) 8) Wash the membrane with PBS-T [0.05 % Tween-20 in PBS] (5 minutes x 6 times). 9) Incubate the membrane with the 1:10,000 HRP-conjugated anti-mouse IgG diluted with 1 % skimmed milk (in PBS, pH 7.2) for 1 hour at room temperature. 10) Wash the membrane with PBS-T (5 minutes x 6 times). 11) Wipe excess buffer from the membrane, then incubate it with appropriate chemiluminescence reagents for 1 minute. Remove extra reagent from the membrane by dabbing with a paper towel, and seal it in plastic wrap. 12) Expose to an X-ray film in a dark room for 1 minute. Develop the film as usual. The conditions for exposure and development may vary. (Positive controls for Western blotting Jurkat, Raji, HeLa)
Restrictions
For Research Use only
Format
Liquid
Buffer
Buffer System: Protein A agarose, PBS containing 50 % glycerol, pH 7.2. Contains no preservatives.
Preservative
Without preservative
Storage
-20 °C
Storage Comment
Upon receipt, store undiluted (in aliquots) at -20°C. Avoid repeated freezing and thawing. Shelf life: One year from despatch.
Target
PARK7/DJ1 (PARK7)
(Parkinson Protein 7 (PARK7))
Alternative Name
dj-1,park7
Background
DJ-1 (PARK7/CAP1/RS) was originally cloned as a putative oncogene capable of transforming NIH/3T3 cells in cooperation with h-ras, a protein expressed in sperm, and a regulator of RNA-protein interactions. DJ-1 has also been isolated as a gene associated with autosomal ea rly-onset Parkinson's disease (PD). Taken together, DJ-1 appears to be involved in diverse biological processes. First, several lines of evidence suggest that DJ-1 plays a role in the oxidative stress response. In cultured mammalian cells, DJ-1 quenches reactive oxygen species and is converted into a variant with a more acidic isoelectric poin t. Therefore, DJ-1 protects against reactive oxygen specie s-induced cell death, and its suppression with small interfe ring RNA (siRNA) sensitizes cells to such insults. Second, DJ-1 modulates transcription through interaction with DJ-1-binding protein as well as with protein inhibitor of activated STAT (PIAS). The latter modulates the activity of various transcription factors. Third, DJ-1 has been recognized as a regulatory subunit of an RNA-binding protein. Fourth, DJ-1, which is structurally related to the molecular chaperone Hsp31, may have chaperone activity itsel f, preventing heat-induced aggregation of substrate proteins, including α -synuclein. In addition, several lines of evidence suggest that DJ-1 plays a role in human tumorigenesis. First, breast cancer patients have elevated levels of circulating DJ-1 and anti-DJ-1 autoantibodies compared to healthy and non-breast cancer patients. Secondly, DJ-1 protein is increased in primary non-small cell lung carcinoma sa mples. Thirdly, treatment of cells from the human lung cancer cell line NCI-H157 with paclitaxel and MEK inhibitor U0126 leads to a decrease in DJ-1 protein expression.