An antibody binds to another protein with anequilibrium constant, K, of 5 × 109 M–1. When it binds toa second, related protein, it forms three fewer hydrogenbonds, reducing its binding affinity by 11.9 kJ/mole. Whatis the K for its binding to the second protein? (Free-energychange is related to the equilibrium constant by the equa-tion ΔG° = –2.3 RT log K, where R is 8.3 × 10–3 kJ/(mole K)and T is 310 K.)

Human Physiology: From Cells to Systems (MindTap Course List)
9th Edition
ISBN:9781285866932
Author:Lauralee Sherwood
Publisher:Lauralee Sherwood
Chapter11: The Blood
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An antibody binds to another protein with an
equilibrium constant, K, of 5 × 109 M–1. When it binds to
a second, related protein, it forms three fewer hydrogen
bonds, reducing its binding affinity by 11.9 kJ/mole. What
is the K for its binding to the second protein? (Free-energy
change is related to the equilibrium constant by the equa-
tion ΔG° = –2.3 RT log K, where R is 8.3 × 10–3 kJ/(mole K)
and T is 310 K.)

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