3S: Proteins Shireen Rudina. What do proteins do? Structure – Collagen in skin, keratin in hair and nails Signaling between cells Defend against disease.

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3S: Proteins Shireen Rudina

What do proteins do? Structure – Collagen in skin, keratin in hair and nails Signaling between cells Defend against disease – Antibodies Facilitate Reactions (enzymes) Do essential work in each cell

Which of these are proteins: 1.DNA 2.Fibers in your heart muscle 3.? 4.?

Catalase is an enzyme 2H 2 O 2  2H 2 O + O 2 + heat Does not happen spontaneously, only in the presence of catalase.

Important: Keeping your data organized! BubblesHeatSplint Test Control Liver Liver, high pH Liver, low pH Heated Liver

Peptide Bonds Connect Amino Acids

Proteins are made of monomers called amino acids

Polypeptide Many amino acids connected by peptide bonds  polypeptides

20 amino acids

Structural Activity

Primary Structure Order of amino acids linked together in a long chain One end carboxyl & one end amino

Secondary Structure Chain of a.a. s bends based on the R groups Alpha helix or Beta pleated sheets

Tertiary Structure Further folding of the polypeptide chain – Disulfide bridges

Quaternary Structure Different polypeptide chains come together to form the final protein