BIOL 2P02 Lecture 4: September 15, 2016
21 Sep 2016
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Document Summary
Proteins are always described as n-terminal (beginning and amino acids), and c-terminal (last amino acid-carboxyl) Single bond between c and n rotates (figure 4. 1b: peptide isn"t a pure single bond it"s a partial double bond. Not easy to flip between cis and trans. Figure 4. 1a: middle figure is a trans; r groups go up because its in trans. H bonding in the backbone, hydrophobicity, and common patterns. 28 nanometers is larger because h bonds are a lot weaker therefore, it has to be a longer bond length: be able to convert all units: micro, nano, picometers and mili, micro, nanolitre. Alpha helix (charged; dipole: h on amide n forms a h bond with the carbonyl o of the 4th residue towards the. N-terminus (figure 4. 4 is a right helix: n-terminus is positively charged and the c-terminus is partially negative charged. All h is identical: r groups are outside of the helix.
