MCB 102 F08 Lect _2

MCB 102 F08 Lect_2 - R group is negatively charged Alanine(Ala A Glycine(Gly G Not a chiral center Valine(Val,V Leucine(Leu L Isoleucine(Ile,I

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Announcements Corrected location for office hour of GSI, Lars Plate, is 561 Stanley Hall (not “61 Stanley”). It’s now correct on bSpace. LABOR DAY HOLIDAY: There is no lecture and there are no Discussion Sections on Mon., 1 Sept. Day and time change for office hour of GSI, Bryan Schmidt. Now Tuesdays, 4-5 PM (and no longer Wednesdays, 11 AM - 12 N). It’s now been changed on bSpace.
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Four Levels of Structure in Proteins Primary Structure Secondary Structure Tertiary Structure Quaternary Structure
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C α H R COO - NH 3 + An L-amino acid Its D-enantiomer A common structure for α -amino acids
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The naturally-occurring α -amino acids are the L-enantiomer
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R group is non-polar and aliphatic R group is aromatic R group is polar and uncharged R group is positively charged
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Unformatted text preview: R group is negatively charged Alanine (Ala, A) Glycine (Gly, G) Not a chiral center Valine (Val,V) Leucine (Leu, L) Isoleucine (Ile,I) Methionine (Met, M) Another chiral center Proline (Pro, P) A secondary nitrogen atom So, proline is an imino acid Phenylalanine (Phe, F) Tyrosine (Tyr, Y) Tryptophan (Trp, W) Phenylalanine π Orbitals of aromatic residues create a cloud of negative charge Serine (Ser, S) Threonine (Thr, T) Asparagine (Asn, N) Glutamine (Gln, Q) Another chiral center Cysteine (Cys, C) Formation of Disulfide Bonds Oxidation Reduction Lysine (Lys, K) Arginine (Arg, R) Histidine (His, H) H H H : Protonation and deprotonization of the imidazole side chain of Histidine Aspartate (Asp, D) Glutamate (Glu, E)...
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This document was uploaded on 10/11/2008.

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MCB 102 F08 Lect_2 - R group is negatively charged Alanine(Ala A Glycine(Gly G Not a chiral center Valine(Val,V Leucine(Leu L Isoleucine(Ile,I

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