the standard protocol for polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulphate (SDS), the amount of SDS that binds to each protein depends primarily on: • The number of amino acids with basic side-chains in the protein. • The isoelectric point of the protein. • The number of lysine and arginine residues in the protein. • The pH of the gel buffer. • The molecular weight of the protein.
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The question is about the standard protocol for polyacrylamide gel electrophoresis (PAGE) in the presence of sodium dodecyl sulfate (SDS). SDS is a detergent that binds to proteins and helps in their separation based on size during electrophoresis. Show more…
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Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) analysis of proteins depends upon stacking of the proteins into a sharp line before they separate in the separating gel according to their molecular weights. (Without this, the gel bands would be diffuse.) Explain how this stacking happens, drawing on your knowledge of the roles of the different gels, of the specific ions and of pH in the concentration of sample proteins into a sharp line.
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What characteristics of the proteins make it possible for them to move in the polyacrylamide gel with the SDS-PAGE technique?
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Sodium dodecyl sulfate (SDS) plays an important role in SDS-PAGE. Select each correct description of what SDS does in denatured electrophoresis. Choose one or more: A. Because SDS is a detergent, it supports the native state by interacting with the nonpolar portions of a protein, stabilizing the three-dimensional structure of a protein. B. SDS is an amphipathic compound that binds to the hydrophobic portion of the protein, coating the mixture and giving the protein an overall negative charge proportional to the size of the protein. C. SDS is a charged detergent that neutralizes the protein, allowing the protein to migrate through the gel based on size. D. Because SDS is a detergent, it plays a role in denaturing the protein.
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