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Bio Lecture 9 Proteins and Nucleic Acids

Bio Lecture 9 Proteins and Nucleic Acids - Lecture 9...

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Unformatted text preview: Lecture 9: Proteins and Nucleic Acids Wednesday 10/14/09 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 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) 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 • Two or more polypeptides (oligomer) – Quaternary structure • Primary structure – Determined by AA sequence To perform its function, it must fold properly! •...
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Bio Lecture 9 Proteins and Nucleic Acids - Lecture 9...

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