A peptide is a chain of amino acids linked together by peptide bonds. Polypeptides usually refer to long peptides whereas oligopeptides are short peptides (< 10 amino acids). Proteins are made up of one or more polypeptides with more than 50 amino acids.
Primary structure
The primary structure of a protein refers to its amino acid sequence. The amino acid in a peptide is also called a residue.
Figure 2-B-1. The amino acid sequence (primary structure) of ribonuclease A (RNase A), which is an enzyme acting on RNA. Each letter represents an amino acid
A peptide bond is the linkage between two amino acids,
formed by the condensation reaction, as shown below:
Figure 2-B-2. Formation of the peptide bond by condensation reaction.
نوسازی تغذیه و حفاظت از گیاهان زراعی با فناوری زیستی، ساری، ایران