Please help and explain this question in depth. 2. A protein complex has a molecular mass of 400 kDa when measured by size-exclusion chromatography.When subjected to electrophoresis in the presence of SDS only, the complex yields three bands withapproximate molecular weights of 180 kDa, 160 kDa, and 60 kDa. When subjected to electrophoresis inthe presence of SDS and a reducing agent, it yields three bands with approximate molecular weights of160 kDa, 90 kDa, and 60 kDa. What is the subunit composition of this protein complex? What type ofoligomer is this? What can you say about the interactions that maintain the quaternary structure of thecomplex?

Step 1Chromatography: Size exclusion chromatography separates biomolecules based on their size,…

Answered: 2. A protein complex has a molecular…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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7
1. Calculate the molecular weight of protein in sample A. Given the protein migration distance is 26 mm and the migration distance of the dye front (gel length) is 6.5 cm.
The results of a separation using two-dimension gel electrophoresis are shown here. Which protein or proteins have the highest pl value? d and e b and c a Which protein has the highest molecular weight? b d a isoelectric focusing electrophoresis pH 5 a b pH 9 d e SDS PAGE electrophoresis
A protein has a molecular mass of 400 kDa when measured by size-exclusion chromatography. When subjected to gel electrophoresis in the presence of sodium dodecyl sulfate (SDS), the protein gives three bands with molecular masses of 180, 160, and 60 kDa. When electrophoresis is carried out in the presence of SDS and dithiothreitol, three bands are again formed, this time with molecular masses of 160, 90, and 60 kDa. Determine the subunit composition of the protein and clearly explain how you came to this determination.
On an SDS-gel, If the distance traveled by the bromophenol blue dye is 7 cm, and the distance traveled by the protein band is 2.8 cm, the mobility of the protein is 40 4 40% 0.4
(a) 1 Normalized fluorescence 0.8 0.6 0.4 0.2 0 50 55 OM 0.100 M 0.200 M 0.300 M 0.500 M 1.00 M 2.00 M 60 113588 65 Temp. (°C) 70 75 80 Where is fully folded protein? • Where is fully unfolded protein? • Where is partially folded protein? • To what does SYPRO orange bind? • Why does fluorescence increase as a function of temperature? ● Define a melting temperature for a protein. • Demonstrate how an estimated melting temperature of the protein in zero molar ligand can be determined. • What is the effect of increasing the molar concentration on melting temperature for this protein? • Why is melting temperature a useful measurement to make for a protein especially if you are interested in protein aggregation?
an protein has a molecular wieght of 90 KD when purified by gel filtration and has a molecular wieght of 60 KD hen purified by electrophoresis which one is the more selective?
1. Suppose a protein sample with a fragment containing the following amino acid sequence is subjected to various chemical assay/tests. - Ala-Gly-Trp-Phe-Met-Cys- What is observed when the protein sample is subjected to Millon’s test? Violet interface Red precipitate/solution Brown/black precipitate Yelllow product No observable result 2. Suppose a protein sample with a fragment containing the following amino acid sequence is subjected to various chemical assay/tests. - Ala-Tyr-Trp-Phe-Cys-Gly - What is observed when the protein sample is subjected to lead sulfide test? Violet interface Red precipitate/solution Brown/black precipitate Yelllow product No observable result
A protein has a molecular mass of 400 kDa when measured by size-exclusion chromatography. When subjected to gel electrophoresis in the presence of sodium dodecyl sulfate (SDS), the protein gives three bands with molecularmasses of 180, 160, and 60 kDa. When electrophoresis is carried out in the presence of SDS and dithiothreitol, three bands are again formed, this time with molecular masses of 160, 90, and 60 kDa. Determine the subunit composition of the protein.
A number of techniques can separate proteins on the basis of their differences in mass. Describe the use of two of these techniques, centrifugation and gel electrophoresis. The blood proteins transferrin (MW 76 kDa) and lysozyme (MW 15 kDa) can be separated by rate zonal centrifugation or SDS-polyacrylamide gel electrophoresis. Which of the two proteins will sediment faster during centrifugation? Which will migrate faster during electrophoresis?
Wh are doing this procedures can you explain? (ex. heating or adding chemicals etc.) 1) Purification of Vitelline from Egg Yolk-Experimental ProcedureMeasure the volume of 3 egg yolks and mix by adding an equal volume of NaCl solution.Extract the mixture with 3-fold volumes of ether and separate the aqueous phase.Do the same procedure 3 times.Mix the sample with water and rinse.It is expected for the protein to collapse.Some more water is added in order to check whether the collapse occurs completely.The sample is centrifuged and the precipitate is dried. 2) Purification of Plasma Albumin and Fibrinogen-Experimental ProcedureAdd ammonium sulfate to 10 ml plasma up to 25% saturation.Separate the collapsed fibrinogen by centrifuge.Increase the saturation level to 33% by adding (NH4) 2SO4.Separate the globulin by centrifugation.Separate prodoglobulins by increasing the saturation level to 46%.Increase the saturation level up to 64% to precipitate albumin.Separate the albumin by centrifuge…
For each of the following denaturing agents, explain the changes that you observed when each of them is added to an egg white in terms of change in protein structure at the molecular level. 1. heat 2. salt 3. baking soda 4. lemon juice 5. ethyl alcohol

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