Fusion proteins The gene for the yeast GAL4 regulator was split in two functional halves that were then cloned separately. Another fusion protein is constructed with the second protein of interest and the GAL4 transcriptional activation domain prey.
Escherichia coli strain JM an d M15 were maintained by our Lab. Human paracancerous normal lung tissues and lung cancer tissues were ob- tained from Department of Thoracic and Cardiovascular Surgery, West China Hospital, Sichuan University.
Prior to use, RNA concentration was spectrophotometrically determined, and RNA integrity was verified by electrophoresis. AFa pair of primers was designed as follows: The sense and anti-sense primers were introduced BamHI and SalI restriction sites underlined respectiv ely.
Expression of Fusion Proteins E. The pellets were resuspended in PBS pH 8. The prot ein extracts of cells transformed with the uninduced bacteria were used as the control. The supernatant soluble fraction was collected for analysis later.
The concentration of the protein was determined according to Bradford . The gel band stained with Coomassie brilliant blue R was excised minced, reduced, alkylated with io- D.
JBiSE doacetamide, In-gel digestion of proteins was carried out with The serum was collected 7 days after the 3rd immunization to de- termine the antibody titer by enzymelinked immunosor- bent analysis ELISA. The last immunization was per- formed one week later, and the antiserum was collected through heart after 7 days.
Cell and Tissue Immunohistochemistry In order to further confirm that the polyclonal antibod ies against rFUS1 are suitable for application in recognizing the innate FUS1 proteins from cells or tissues, immuno- histochemistry was performed in A cells transfected with FUS1 constructs and normal lung tissue respec- tively.
Hoechst staining was used to identify apoptosis induced by FUS1 expression in A cells.
Stained nuclei were detected after washing twice with distilled water and observed under a fluores- cence microscope. The cell was per- meabilized with 0. The second antibody was a biotinylated goat anti-rabbit IgG. Brown staining was considered positive.
Then, indirect immunostain- ing for FUS1 was performed on paraffin-embedded tis- sues by using the LSAB labelled streptavidin—biotin method to visualize antibody response as described above. DNA marker; lane 1: The ex- pressed protein was approximate 16 kDa. No observable difference was ob- served in the expression form of the rFUS1.
When it was expressed in E. In order to determine the optimal induction time for maximum expression of the protein, the cells were incu- bated for 1 to 5 h after IPTG was added.
The cell lysates were analyzed every one hour after IPTG induction. The pellet was washed by gradient urea from 1 M to 8 M . The inclusion bodies began to dissolve in 2M urea buffer.
More rFUS1 were dissolved to a gradually increasing concentration of urea with more hybrid proteins. So the inclusion bodies were dissolved in 2 M urea buffer. Solubility identification and purification of rFUS1 in E.
The membrane was incubated with blocking buffer [0. The membrane was washed 3 times with washing solution Tween 0. After washed 3 times with wash- ing solution, the membrane was treated with SuperSignal West Pico Chemiluminescent Substrate Pierce for 5 min, then exposed to HyperWlm Amersham Biosciences for 5 min and visualized.
The result from MS data suggested that the identified protein exactly matched with human FUS1 protein, which had a Mascot score All matched peptides were shown in Figure 5 c underlinedwhich indicated that the purified recombinant protein FUS1 were completely correct.
A sufficient amount of purified FUS1 protein would make it possible to prepare polyclonal antibodies against FUS1 and to further analyze its interacting pro- teins or structure by X-r a y crystallography.
Analysis of purified rFUS1 by Western blot. Che- miluminescence immunoassay was used for color development. The result indicated that the antiserum from rabbit can recognize both exogenous recombinant FUS1 and endogenous FUS1 effectively.
There were positive bands at the po si- tion of approximately 16 kDa Figure 6. However, non- immunized serum was negative data not shown.Sep 27, · Escherichia coli or Shigella) viruses (i.e.
Norovirus) toxin-producing organisms (i.e. Bacterial transcription is the process in which messenger RNA transcripts of genetic material in bacteria are produced to be translated for the production of proteins.
bipolar disorder, birth defect, birth defects, body type. Dd essays. After incubating the labeled bacteriophage particles with Escherichia coli and separating extracellular phage particles from the bacteria, Hershey and Chase measured the amounts of radioactive phosphorus and sulfur inside.
Escherichia coli bacteria found in the contaminated wastewater is known to significantly affect human health. Usually, E. coli inactivation can be done by a variety of methods, such as boiling, solar heating, radiating, filtering with filter paper or sheet, and applying certain chemicals to annihilate the cells of microorganisms [1,2,3,4,5].Solar irradiation is an effectively convenient method.
To this end, a hormone binding assay was developed that uses living Escherichia coli cells expressing distinct receptor proteins from Arabidopsis. This assay has been shown to be specific and to yield biochemical data similar to those obtained with isolated receptor-containing membrane fractions (Romanov et al., ).
For the JACS study, the Scripps Research-led team created Escherichia coli bacteria that partially build their DNA with ribonucleotides, the molecular building blocks typically used to build RNA. It has been proposed that GroEL homologs (i.e., proteins homologous to the Escherichia coli GroEL protein) produced by endosymbionts (for mealybugs, the β-endosymbiotic bacteria, which are the primary endosymbiont and always present, were suggested), are .