Cys - Cys (-S-S-) disulphide bridges
A disulphide
brdige arises when two non-adjacent cysteine
(Cys) residues are brought together to form a
covalent -S-S- bond. Disulphide bridges can form
between residues hundreds of residues apart, or between
subunit chains in the tertiary or quaternary structures.
Figure © 2012 TA Brown, Introduction
to Genetics (1st ed.); additional
text © 2015 by Steven M. Carr