BCH210H1 Lecture Notes - Lecture 4: Enzyme, Phenylalanine, Heptad Repeat
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BCH210H1 Full Course Notes
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Ch 2 (q 1(abc), 2(abc), 3, 4, 19b) Lecture 4/12 - intro to proteins and protein structure. Peptide bond is the one shown in lighter grey. Resonance gives this partial double bond a certain character. The structure can change dep on movement of the electrons. Because of this, peptide bond is restricted in its rotation. This leads to a trans conformation that is rigid and cannot turn. Peptide bond is planar and trans between carbonyl o and amide h. It is flat because of the restriction of movement. Dihedral angle omega about the peptide cn bond is fixed at 180 degrees. The planes can be rotated around the alpha carbon in the middle, shown below. Angle bw c-alpha and n, and c-alpha with next c. Omega ( ): angle around the c-n (peptide) bond. Chi ( ): angle that desc the side chain rotation - around c and c .
