Please describe the protein purification process with the aim of purifying a protein which locates on nucleus membrane.
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Please describe the protein purification process with the aim of purifying a protein which locates on nucleus membrane.
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- The diffusivity of amino acids in polyacrylamide gel is approximately 1x10^-9 cm2./s calculate the initial flux of amino acids, give an instantaneous gradient of (20g/cm 3 )/8cm Why is polyacrylamide gel is used in electrophoresis?From this standard curve and chart below, does the separation of molecules in the mixture appear successful from the gel filtration? Is there a clearlydefined separation between molecules? Explain your conclusions. Parameters required for calculation of coefficient (Kd) for unknown protein Volume eluted (mL) Which variable does this volume represent in the equation for Kd? Fraction with maximal DNP-Aspartate detected 36 Vt Fraction with maximal Protein detected 24 Ve Fraction with maximal Blue dextran detected 6 VoIn 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 series of standard proteins and an unknown enzyme were studied by gel filtration on a Sephadex G200 (the 200 refers to the maximum pore size in kDa) column. The elution volume Vel for each protein is given in Table 1 below. (a) Plot the data in the form of log Mr versus elution volume. From the line of best fit through the points for the standards, determine the Mr of the unknown enzyme. Explain why ferritin and ovomucoid behave anomalously. Table 1 - The Vel versus Mr data Protein Mr Vel (mL) Blue dextran* Lysozyme Chymotrypsin Ovalbumin Serum albumin Aldolase Urease Ferritin# Ovomucoid# Unknown 1,000,000 14,000 25,000 45,000 68,500 150,000 500,000 700,000 28,000 ⎯ 85 200 190 170 150 125 90 92 160 139 *Blue dextran is not a protein but a high-Mr carbohydrate that has a covalently bound blue dye, and it elutes with the void volume of the column. # Do not…During the early stages of an enzyme purification protocol, when cells have been lysed but cytosolic components have not been separated, the reaction velocity-versus-substrate concentration is sigmoidal. As you continue to purify the enzyme, the curve shifts to the right. Explain your results. This is an allosteric enzyme and you must use a Lineweaver-Burk plot to determine KM and Vmax correctly. This is an enzyme that displays Michaelis-Menten kinetics and you purify away an inhibitor. This is an allosteric enzyme and during purification you purify away an activator. This is an allosteric enzyme displaying a double-displacement mechanism and during purification you purify away one of the substrates: This is an enzyme that displays Michaelis-Menten kinetics, and you must use a Lineweaver-Burk plot to determine KM and Vmax correctly.In the Biuret Assay for protein concentration determination, the role of sodium potassium tartrate is to prevent the (gaining, losing) of electrons by Cu2+.
- You run 5 standard proteins listed below on a size-exclusion (gel filtration) column with limit of 200,000Da. Please draw a chromatogram on a separate page with each peak and both axes labeled. Protein B-Amylase Alcohol dehydrogenase Bovine albumin Carbonic anhydrase Cytochome A280 MW 223,800 0.5 82,000 0.6 66,463 0.45 30,000 0.43 12,000 0.8Consider the following protein mixture: Protein A B C D Molecular Weight (kDa) 50 150 200 350 Affinity to Metal ion === Zn²+ === 1. Using hydrophobic interaction chromatography, the protein that will be eluted last is [Select] 2. Using affinity chromatography, the protein that will be eluted last in a Zn²+-containing column is 3. The protein with the fastest migration towards the anode in SDS-PAGE is [Select] IpH value 7 3 9 5 [Select] [Select] 4. Using a buffer solution with a pH of 4, the protein that will bind to an anion exchanger is 5. The protein that will be eluted last in a gel filtration column is [Select] 6. Using isoelectric focusing, the protein that will have a protein band nearest to the cathode (negative electrode) is [Select] % Hydrophobicity 20 45 75 55You have performed protein purification on your new favorite enzyme using a protocol which involves the following steps/samples: crude extract, ammonium sulfate cut, ion exchange and gel filtration. You need to run 25ug of protein from your crude extract sample on an SDS-PAGE gel. You have determined that the protein concentration of your crude extract sample is 2.1mg/ml. Your total sample volume is 30ul. You have water for your diluent and 6x SDS-loading dye to prepare your sample. List the components of your prepared sample. Note: you will only have access to a P20 and a P200 to prepare this sample.
- suctose density gradient ultractifugation is a powerful technique for fractionating macromolecules like DNA,RNA and proteins.some protocols using sucrose gradients mention the following:10 mL sucrose gradients 10-15%(w/v) in 10 mM HEPES buffer.How would you prepare this sucros gradient?The purification continues with a cation exchange step in which the positively charged cytochrome C protein is separated from negatively charged DNA and other proteins. The cation exchange eluate (volume of solution collected) had a total volume of 42.0 mL and a 1.0 mL aliquot was set aside for further analysis. The following data was obtained from the 1.0 mL aliquot to quantify the protein amount and purity: The absorbance at 410 nm of the aliquot was diluted 5-fold was 0.474 (1 cm pathlength). The absorbance at 595 nm from a 1.0 mL Bradford Assay solution that was diluted by 100-fold from the aliquot was 0.195 (1 cm pathlength). Using the information given, Calculate the total protein amount in mg from the absorbance at 595 nm. Calculate the cytochrome C amount in mg from the absorbance at 410 nm using Beer’s Law.Give only typing answer with explanation and conclusion You want to make 94 µL of the diluted Cell-Free extract for estimation of total protein. To do this, how much water will you add to the correct volume of the undiluted cell-free extract? Note: Cell-free extracts will need to be diluted 1:25 in water.