Antibody Structure Problem Set
Problem 8. Water and antigen binding
The crystal structure of the Fab complexed to antigen reveals a number of water molecules that are fixed in the binding area. Many of these water molecules form hydrogen bond bridges between antigen and antibody, contributing to the strength of binding. There is no evidence for the exclusion of water from the antibody/antigen complex. The affinity for binding can be expressed by the equation describing free energy in a system: ΔG = ΔH - TΔS, where G = free energy or energy available for work, H = total energy in a system (enthalpy), T = absolute temperature (in Kelvin) and S = entropy. Which of the following statements are correct concerning the generation of a negative ΔG (indicating a spontaneous reaction) for high affinity antibody/antigen binding?
The University of Arizona
Tuesday, June 20, 2000
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