Aim: Proteins Warm-up: HW:

Proteins What it does in the BODY? Build and repair muscle Meat, Fish, Nuts, Beans, & Egg Whites Contain C, H, O, N What it does in the BODY? Build and repair muscle Enzymes, Antibodies, Hormones insulin

Proteins O | H —C— || C—OH N Building block = amino acids – 20 different amino acids There’s 20 of us… like 20 different letters in an alphabet! Can make lots of different words N H | —C— C—OH || O variable group

Amino Acid Structure VARIABLE GROUP

Different Types of Proteins 1 amino acid = Peptide 2 amino acids = Dipeptide Many amino acids = Polypeptide

-CHAINS of amino acids make up proteins -Proteins can be 100’s of amino acids together

For proteins: SHAPE matters! Proteins fold & twist into 3-D shape that’s what happens in the cell! Different shapes = different jobs growth hormone hemoglobin pepsin

It’s SHAPE that matters! Unfolding a protein destroys its shape Wrong shape = can’t do its job Unfolding proteins = “denature” Increase in Temperature pH (acidity) unfolded “denatured” folded