Lecture 6 - Wednesday, September 6, 2006 Lecture 6...

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Wednesday, September 6, 2006 Lecture 6 Announcements: 1. The quiz and the answer keys are now posted at our web site, under This Year's Tests. 2. Meet this Friday afternoon with any interested students to talk about, How do I apply to graduate schools? What are they looking for?! Comstock B106 from 1:25– 2:15PM, Friday 9/8. Monday's lecture: 6 categories of forces constraints around the peptide bond + real size of atoms ìRamachandran Map Today’s lecture: ALPHA-HELIX: p. 50 1. φ -60 o and ψ -40 o . We see a well-defined structure when these angles repeat for at least 5 residues. In proteins, the average length is about 11 AA. 2. The side chains of the AAs all face away from the main chain (long axis) of the helix to minimize steric hindrance. 3. Every possible hydrogen bond between a carbonyl group (C=O) and amino group (N-H) is formed. 4. For every 4 AAs, there is a hydrogen bond between the C=O of one AA peptide bond with the -NH group of the peptide bond 4 down in the sequence. 5.
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Lecture 6 - Wednesday, September 6, 2006 Lecture 6...

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