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Lecture+9+Web-Bio93-2008

Lecture+9+Web-Bio93-2008 - Lecture 9 Proteins and Nucleic...

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1 Lecture 9: Proteins and Nucleic Acids Wednesday 10/15/07 Reading Chapter 5 pgs. 77-89 Proteins • Function – support, storage, transport, signaling, receptors, movement, catalysis, defense • Structure – Amino Acids: monomers, combine to form polymers – Polypeptide: polymer of AAs in specific sequence – Protein: one or more polypeptides with specific 3- D conformation Amino acids polypeptides proteins
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2 Amino Acids • Structure –Alpha Carbon • Amino group • Hydrogen • Carboxyl group • R group: variable side chain – Hydrophobic (9/20) – Hydrophilic (polar 6/20) – Ionized (acids and bases) (5/20) Formation of polypeptides AA are joined by dehydration reactions. peptide bond (covalent) Polypeptide Amino end N terminus Carboxy end C terminus Few to thousands of monomers (aa)
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3 The function of a protein depends on its conformation There are three levels of structure in a single polypeptide that organize the folding – Primary – Secondary – Tertiary
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