new protein of unknown structure has been purified. Gel filtration chromatography reveals that the native protein has a molecular weight of 300,000. Chromatography of the protein in the presence of 6 M guanidine hydrochloride (a denaturant) yields a single peak corresponding to a molecular weight of 50,000. Chromatography of the protein in the presence of 6 M guanidine hydrochloride and 10 mM beta-mercaptoethanol (a disulfide bond reductant) yields peaks corresponding to molecular weights of 30,000 and 20,000. What does this data tell you about the structure of this protein? (Be thorough in your answer!)

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