What functional group of the protein opsin reacts with retinal to form rhodopsin, a light-sensitive pigment?

Question

Quizplus · Accepted Answer

The amino acid residue lysine (K) in opsin reacts with the aldehyde group of retinal to form a Schiff base, which is stabilized by a protonated counterion (usually a nearby glutamic acid residue). The functional group present in lysine is an amine (-NH2), which is represented in choice C.

What Functional Group of the Protein Opsin Reacts with Retinal ∘\circ∘

What Functional Group of the Protein Opsin Reacts with Retinal $\circ$