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A protein has a molecular mass of 200 kDa as determined by gel filtration (=nati

ID: 89395 • Letter: A

Question

A protein has a molecular mass of 200 kDa as determined by gel filtration (=native molecular weight). When separated by SDS-PAGE (without a reducing agent present) only one polypeptide appeared with a mass corresponding to 100 kDa. When determined by SDS-PAGE in combination with a reducing agent (DTT) exactly two polypeptides appeared of sizes 40 and 60 kDa. What is the correct structure of the native protein? Correct ans: The native protein is made of two 40 kDA and two 60 kDA polypeptides

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