N-terminus and C-terminus disulfide bonds
intermolecular
Disulfide bonds are covalent bonds that form between two sulfur atoms, typically in the amino acid cysteine. These bonds are important for stabilizing the three-dimensional structure of many proteins. The ends of a protein chain are referred to as the N-terminus and C-terminus.
It is possible for disulfide bonds to form between cysteine residues at the N-terminus and C-terminus of a protein chain. However, this is relatively rare, as it requires the protein to fold in such a way that these two ends come into close proximity.
In most cases, disulfide bonds form between cysteine residues that are located within the interior of the protein. These bonds help to stabilize the protein structure by holding together regions that would otherwise be separated by water molecules. In addition, disulfide bonds can also play a role in protein function by helping to create active sites or binding surfaces.
Overall, while disulfide bonds between the N-terminus and C-terminus are possible, they are not commonly observed. Instead, disulfide bonds tend to form between cysteine residues located within the protein structure.
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