BCH210H1 Lecture Notes - Lecture 4: Side Chain, Alanine, Hydroxyproline

• School: UTSG
• Department: Biochemical Engineering and Applied Chemistry
• Course: BCH210H1
• Professor: Wright

Document Summary

H - bond is about 1. 3 a distance (very small) Gives the c-n bond double bond characters. The double bond properties restrict the rotation of the single bond. The alpha c from one aa to another alpha c aa across will always be 108 o between the. Peptide bond is planar and trans between carbonyl and amide h. Dihedral angle about the peptide c-n bond is fixed at 180 o side chain. Rotation around the alpha c is dependent on the. ___ (phi) is the angle around the n-c . ___ (psi) is the angle around the c -c=o. ___ (omega) is the angle around the c-n (peptide) bond. ___ (chi) angle describes side chain rotation. Helix: (phi ,psi ) = (-60 o , -50 o ) turns: 3. 6 residues. Sheet: (phi ,psi ) = (-140 o , +135 o ) Polyproline helix: ( phi , psi ) = (-60 o ,+135 o )