Question
The molecular weight of an unspecified protein, at physiological conditions, is 70,000 Dalton. The SDS-polyacrylamide gel electrophoresis (SDS PAGE) of the protein yields a single band corresponding to molecular weight of 70,000 Dalton. However, in the presence of the reducing agent, β-mercaptoethanol, the SDS PAGE shows two bands, corresponding to molecular weights of 30,000 and 20,000 Dalton.
From these data, describe the native protein in terms of the number of subunits present, their molecular weight, stoichiometry of subunits, and the kinds of bonding existing between the subunits.
From these data, describe the native protein in terms of the number of subunits present, their molecular weight, stoichiometry of subunits, and the kinds of bonding existing between the subunits.
A 3 – 30,000 and 20,000 – 1×30,000 and 2×20,000 – disulfide
B 4 – 30,000 and 20,000 – 2×30,000 and 2×20,000 – disulfide
C 2 – 30,000 and 40,000 – 1×30,000 and 1×40,000 – noncovalent
D 2 – 30,000 and 40,000 – 1×30,000 and 1×40,000 – disulfide
This question is taken from Chem 221 – Biochemistry for Science Majors » Fall 2021 » L7 Working with Proteins
