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Lecture 6

BIOL 201 Lecture Notes - Lecture 6: Disulfide, Steric Effects, Electronegativity


Department
Biology
Course Code
BIOL 201
Professor
Robin Young
Lecture
6

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Intramolecular interactions
Levels of protein structure (from BIOL 200):
Interactions
Covalent bonds
between
backbone atoms
only
Covalent bonds
between R
groups
Non-covalent
bonds between
backbone atoms
only
Non-covalent
bonds between
backbone and R
groups
Non-covalent
bonds between
atoms in two R
groups
Primacy
(sequence)
Secondary
(helices,
sheets)
()
Tertiary
(protein fold)
()
(disulphide
bond)
()
Quaternary
()
()
Non-covalent bond terminology
Non-covalent bond types
(strongest to weakest)
Common name(s)*
Ionic
Ionic, electrostatic
Ion-permanent dipole
Van der Waals
Permanent dipole-permanent dipole
Van der Waals
Special case of Permanent dipole-permanent
dipole: between hydrogen and an
electronegative atom
Hydrogen bond
Permanent dipole-induced dipole &
Ion-induced dipole
Van der Waals
Induced dipole-induced dipole
Van der Waals, London forces, London
dispersion forces
*Note that “van der Waals” is a broad term including all non-covalent bonds except for hydrogen
bonds and ionic bonds. “London dispersion forces” and “London forces” are a subset of van der
Waals, specifically referring only to ID-ID bonds.
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