30. Protein A has an isoelectric point of 9.2 and protein B has an isoelectric point of 4.0. To keep a stable
heterodimeric complex A/B in solution, which experimental condition in the following is more favorable?
(A) 100 mM glycine (pH 9.0)
(B) 50 mM sodium phosphate (pH 6.5), 500 mM sodium chloride
(C) 100 mM glycine (pH 3.0)
(D) 20 mM Tris-HCI (pH 8.0), 0.1 % SDS
(E) 50 mM sodium phosphate (pH 6.5)
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