Cysteine is the amino acid with a sulfhydryl group in its functional group, which is the property that allows cysteine to form disulfide bridges in protein structure.

What functional group is disulfide?

In biochemistry, a disulfide refers to a functional group with the structure R−S−S−R′. The linkage is also called an SS-bond or sometimes a disulfide bridge and is usually derived by the coupling of two thiol groups.

Is a disulfide bond a functional group?

Illustrated Glossary of Organic Chemistry - Disulfide. Disulfide: A functional group featuring a sulfur-sulfur single bond bond flanked by two carbon atoms. Generic disulfide structure. (1-methyl-2-phenyldisulfane).