Question

Identify the amino acids and type of interaction that occurs between the following R groups in tertiary protein structures:

a)

b)

c)

d)

Short answer

(Part a)

a)

(Part b)

b)

(Part c)

c)

(Part d)

d)

Step-by-step solution

step-1 Introduction (Part a)

• Amino acids are the building blocks of proteins.
• One hydrogen atom, one amine group $\left(-{\mathrm{NH}}_2\right)$, one carboxylic acid group $(-\mathrm{COOH})$, and one side chain $\mathrm{R}$group are all connected to the central carbon atom in these molecules.
• Depending on the structure, the R group might be polar, neutral, or charged.
• Their chemical makeup influences how they interact with one another.

step-2  Given information (part a)

The amino acids and their possible interactions with the R groups are listed below:

step-3  Explanation (part a)

step-4 Given information (part-b)

Aspartic acid and lysine are linked by a salt bridge.

step-5 Explanation (part-b)

step-6 Given information (part-c)

A disulfide link connects cysteine with cysteine.

step-7 Explanation (part-c)

step-8  Given information (part-d)

Because both leucine and alanine are nonpolar, they interact hydrophobically.

step-9 Explanation (part-d)