A protein with molecular weight of 100 kD is subjected to SDS PAGE electrophoresis. The SDS PAGE electrophoresis pattern show two widely separated bands of 20kD and 30kD after addition of Mercaptoethanol. The true statement regarding this will be.
Correct Answer: The protein is a dimmer of two 20kD and 30kD proteins
Description: Most widely used method for determination of purity and molecular weight of proteins is SDS- PAGE i.e. polyacrylamide gel electrophoresis in the presence of anionic detergent sodium dodecyl sulfateSDS PAGE gel electrophoresis separates proteins on the basis of their relative molecular weight alone. Since the results of SDS PAGE electrophoresis show two bands only, the protein that underwent SDS-PAGE is composed of polypeptides with two different molecular weights (One of 20 KD and the other of 30kD). If the protein in question was a monomer its molecular weight should have been 50kD. Since the protein has a molecular weight of 100kD, the protein is likely to be a dimmer of two 20 kD proteins (Which form one band) and two 30 kD proteins (Which form the other band).
Category:
Biochemistry
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