Peptide bond

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Bond that connects two residues

Amino acid valine and serine and the dipeptide Valine-Serine
Process of peptide bond formation

Proteins are constructed from amino acids that are connected via a so-called peptide bond. In the figure below, you see from left to right the amino acids valine, serine, and the di-peptide made by connecting those two amino acids. In the reaction that forms the peptide bond the valine looses one of its backbone carboxylic oxygens, and the serine looses two protons from its backbone nitrogen.