10 - 1 Four levels of protein structure 2 Design-a-protein...

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1 9/10/10 1. Four levels of protein structure 2. Design-a-protein 3. Weak bonds are significant in biology 4. How we learn about proteins Buskirk office hours Mon 8/13 (PAI 3.04) 3:30-5 pm, not 2-3 pm Tuesday 8/14, 10 am - noon When units (e.g., sugars) are linked together to make a chain, a water molecule is released (dehydration ). When a chain (e.g., starch) is digested down to its individual units (hydrolysis ), a water molecule is used up. This is uncharged form of the basic structure, common to all amino acids. Now, let’s look at the R groups (side- chains) What’s important? -recognize their properties -predict what kind of bonds an R group could form with another PEPTIDE BOND PEPTIDE BOND covalent bond between C atom of a carboxyl group and the N atom of an amino group. releases a molecule of H 2 O, in a condensation reaction Peptide bonds form by condensation (=dehydration synthesis) reactions. So, what’s left of the original amino acid structures?
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