Proteins

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Proteins:

Proteins Polypeptides composed of covalently linked amino acids Polypeptides with <40 amino acids are called peptides Polypeptides with >40 amino acids are called proteins Function of a protein determined by its non-covalent 3D structure

Amino Acids:

Amino Acids

Polypeptides:

Polypeptides

Protein Structure:

Protein Structure

The Problem with Proteins:

The Problem with Proteins Very large and unstable molecules Structure is held together by weak noncovalent forces Easily destroyed by relatively mild storage conditions Easily destroyed/eliminated by the body Hard to obtain in large quantities