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- The protein concentration of a known standard is 100mg/mL If you prepared a serial dilution, mixing 10μL of protein with 40μL of water what would be concentrations of the first 3 dilutions?Figure 3: ● ● ● ● ● ● KDa ● 97.4 66.2 45.0 ● 31.0- 21.5 14.4 S-1 p-1 S-2 2-0 This figure was generated by centrifuging a pura sample of protein, removing the supernatant, and resuspending the pellet in the same volume as the supernatant to allow direct comparison. The supernatant and pellet samples were then prepared for SDS-PAGE identically and run via normal SDS-PAGE procedures. In the figure, "s" means supernatant and "p" means pellet. The text or number after the dash represents a different condition. For example, s-1 and p-1 are the supernatant and pellet samples under condition 1. It is not shown, but under wild-type conditions, essentially all of the protein is found in the supernatant. S-3 ● What does the intensity of each band represent? ● Would you find soluble protein in the supernatant or pellet? Why? Would you find aggregated protein in the supernatant or pellet? Why? For each condition (there are 5 different conditions), is there a higher percentage of the total protein…A vial of Doxorubicin reads 0•5g per vial. Instructions say to reconstitute each 12mg with 2•5ml of NS. How many ml of NS will be needed to reconstitute the vial of the recommended concentration? please show working
- An ion-exchange chromatographic separation is performed using a diethyl-aminoethyl- (DEAE)-sepharose column to separate proteins in a mixture. The mixture contains Protein A (pl=6.0), B (pl35.0), C (pl=7.5), D (pl =1), and E (pl=4.0). The protein mixture is prepared in a buffer solution pH =5. When the protein mixture is loaded onto the column, and the column is washed with a buffer solution pH 5, which protein(s) will be captured by DEAE-sepharose in the column? O Protein B because it is predominantly in net negative charge form. O Proteins D and E because they have predominately net negative charge in pH 5 solution O Proteins A, C, D and E because they have charges O Proteins A and C because both both predominantly have net positive charges O Proteins Band E because both predominantly have net positive charges(a) The octapeptide AVGWRVKS was digested with the enzyme trypsin . Which method would be most appropriate for separating the products: ion-exchange or gelfiltration chromatography? Explain. (b) Suppose that the peptide was digested with chymotrypsin . What would be the optimal separation technique? Explain.Gel-filtration chromatography is a useful method for removing salts, such as ammonium sulfate, from protein solutions. Describe how such a separation is accomplished.
- Using DEAE-cellulose as ion exchange resin, indicate the starting and ending pH for the narrowest experimental pH range used to separate an amino acid mixture consisting of Gln, Leu and Lys Starting pH: _____ Ending pH: _____In a gel filtration chromatography, what type of gel must be used when the protein size is 2500 Da? Explain.In a mixture of five proteins listed, draw an elution profile (Absorbance vs. mL eluted, arbitrary) for the purification of the listed proteins on a gel filtration chromatography resin: cytochrome c (pI = 5.4; Mr = 13,000), immunoglobulin G (pI = 7.3; Mr = 145,000), ribonuclease A (pI = 9.6; Mr = 13,700), RNA polymerase (pI = 6.3; Mr = 450,000), human serum albumin (pI = 5.4; Mr = 68,500). Label your elution peaks. Draw a sketch of an SDS-PAGE, reflecting the mobility of the above mixture as they elute from the column. Label you protein bands.
- a. An oligopeptide ALVGALGATPTPQMWSHSWRGVSIKS was digested with trypsin.Which method would be most appropriate for separating the products: ion exchange or gel filtration chromatography? Explain.b. Suppose that the peptide was digested with cyanogen bromide. What would be the optimal separation technique? ExplainA purified protein fraction has a total sample volume of 360 µL. The sample has a corrected A280 of 0.484, and the blank corrected A280 was 0.052. (Both values were measured with a path length of 1.00 cm.) If 5.00 µL of the sample was used in a reaction, calculate the mass of protein in the reaction (in µg).The following stock solutions are available to make a protein extraction buffer: 100% Nonidet P-40, 1 M Tris-Cl, and 0.5 M EDTA. What quantity of the original stocks will be needed to make 250 ml of buffer with the following final concentrations: 0.5% Nonidet, 150 mM Tris-Cl, and 10 mM EDTA?