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PROTEIN STABILITY

Protein Stability
Unpaired H-bond donors and acceptors are found in the hydrophobic core of a protein

rarely
only on Pro residues
only at the ends of a-helices
only at the turns connecting p-strands

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Protein Stability
For the unfolding reaction of Protein G, ΔH° =210.6 kJ/mol, this means that

unfolding is favored enthalpically
the entropy is positive at all temperatures
folding is favored enthalpically
the entropy is negative at all temperatures

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Protein Stability
Attractive Vander Waals forces occur between

any pair of nearby atoms
polar molecules in the solid state
only if other forces are less favorable
apolar molecules in the liquid state

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Protein Stability
Which of the following forces is the most favorable for protein folding?

Hydrogen bonds
Vander Waals interactions
Conformational entropy
Hydrophobic Interactions

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Protein Stability
At the midpoint of a temperature transition curve,

[Native] = [Unfolded]
All of these
half of the protein is denatured
Keq = 1.0 and ΔG = 0

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