Amino acids, peptides (such as in ghrp 6), and proteins are often referred to as the terms are interrelated, but they are different in their characteristics. Amino acids are the building blocks of peptides and proteins. Amino acids are small molecules that contain an amino group (-NH2) and a carboxylic acid group (-COOH), which is attached to the central carbon atom, with the addition of hydrogen and a side chain (R group). The side chains vary among all of the amino acids; because it determines the unique character and chemistry of each amino acid. Specific gene sequences that are used to determine the sequence of amino acids in both peptides and proteins.

– Peptides

Peptides are made with two or more amino acids linked by peptide bonds and are present as a linear chain. The length of the peptide is determined by the number of amino acids in it. Usually, the peptide length is less than about 100 amino acids. The main function of the majority of peptides is to enable effective communication with the biochemical messages from one place to another in the body.

– Protein

Proteins are the most diverse group of biological macromolecules. A protein consisting of one or more long branched chains called polypeptides and protein constituents of the previous is an amino acid. The sequence of amino acids determines the main characteristics of the protein, while the amino acid sequence is defined by a specific gene sequence.

What makes Peptides and Proteins different?

– While proteins are very long chains of amino acids, peptides are short linear chain of amino acids.

– Some amino acids are linked together to form a peptide by peptide bonds, while some of the peptides are linked together to form protein molecules.

– Normally, the protein has a stable three-dimensional structure. Instead, peptides are not arranged in a stable three-dimensional structure.

– The length of the peptide is less than about 100 amino acids, whereas proteins are more than 100 amino acids. (There are exceptions, relying on more differences in molecular function, rather than their size)

– Unlike peptides, proteins are considered as macromolecules.

– In the peptides, the amino acid side chains only form hydrogen bonds. In fact, protein, not only the side chain but also the group of peptides, forming hydrogen bonds. This hydrogen bond can with water or with a group of other peptides.

– All the peptides present in a linear chain and protein can exist as a primary, secondary, tertiary, and quaternary.