Question

1. the detergent sodium dodecyl sulfate (sds) denatures proteins. suggest how sds destroys protein structure.

Explanation:

SDS is an anionic detergent. It binds to hydrophobic regions of proteins in a roughly constant ratio (about 1.4 g SDS per gram of protein), disrupting the hydrophobic interactions that stabilize the protein's tertiary and secondary structures. This binding also imparts a uniform negative charge to the protein molecule, overriding the protein's inherent net charge. Additionally, SDS breaks down disulfide bonds when used with reducing agents, further disrupting the protein's native 3D structure, leading to full denaturation into linear polypeptide chains.

Answer:

Sodium dodecyl sulfate (SDS) destroys protein structure through two key mechanisms:

1. It binds to the hydrophobic regions of proteins, disrupting the hydrophobic interactions that maintain the protein's secondary and tertiary structures, unfolding the protein into a linear chain.
2. It imparts a uniform strong negative charge to the protein molecule, overriding the protein's inherent charge distribution, which eliminates intramolecular electrostatic interactions that stabilize the native structure. When paired with reducing agents, it also breaks disulfide bonds, further disrupting quaternary and tertiary protein structure.