A protein with a known mass of 240 kDa is treated with beta-mercaptoethanol, a sulfhydryl reducing agent. When the resultant peptide mixture was analyzed by SDS PAGE, one protein band of 60 kDa was present. How many disulfide bonds were present in the original structure of the protein? Group of answer choices 4 2 1 3

Nutrition Now
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ISBN:9781337415408
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Chapter15: Proteins And Amino Acids
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A protein with a known mass of 240 kDa is treated with beta-mercaptoethanol, a sulfhydryl reducing agent. When the resultant peptide mixture was analyzed by SDS PAGE, one protein band of 60 kDa was present. How many disulfide bonds were present in the original structure of the protein?

Group of answer choices
4
2
1
3
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Step 1

Proteins are biomolecules composed of amino acids. Tertiary structure is the level of conformation, in which the proteins become completely active. And disulfide bonds stabilize the tertiary structure. Proteins with more than one polypeptide exist in quaternary structure. Molecular complementarity, hydrogen bonds, and van der waals interaction stabilize a quaternary structure. Also disulfide bonds help to hold the individual polypeptides of a multimeric protein.   

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