Question: You are studying a protein complex that has 4 different protein chains A(15 kDa), B(13 kDa), C(12 kDa), and D(10 kDa) a. Using size exclusion

You are studying a protein complex that has 4 different protein chains

A(15 kDa), B(13 kDa), C(12 kDa), and D(10 kDa)

a. Using size exclusion chromatography, you see this complex is approximately 100 kDa. How is this possible?

b. You increase the salt concentration and run size exclusion chromatography again, You collect two peaks, Fraction 1 at 50kDa and Fraction 2 at 25 kDa. You run SDS-PAGE of these fractions and see that Fraction 1 contains A and D while Fraction 2 contains chains B and C. Explain this data.

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