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Peptides and Proteins

• polymers of amino acids

• biologically occurring polypeptides range in size

from small to very large, consisting of two or three

to thousands of linked amino acid residues

• two amino acid molecules can be covalently joined through a

substituted amide linkage, termed a peptide bond, to yield a

dipeptide

• linkage is formed by removal of the elements of water

(dehydration) from the carboxyl group of one amino acid and

the -amino group of another

• three amino acids can be joined by two peptide bonds to form

a tripeptide

• similarly, amino acids can be linked to form tetrapeptides,

pentapeptides, and so forth...

Peptides and Proteins

• polymers of amino acids

• biologically occurring polypeptides range in size

from small to very large, consisting of two or three

to thousands of linked amino acid residues

• two amino acid molecules can be covalently joined through a

substituted amide linkage, termed a peptide bond, to yield a

dipeptide

• linkage is formed by removal of the elements of water

(dehydration) from the carboxyl group of one amino acid and

the -amino group of another

• three amino acids can be joined by two peptide bonds to form

a tripeptide

• similarly, amino acids can be linked to form tetrapeptides,

pentapeptides, and so forth...