There is no Mini Lab Report for Lab 11. What follows are some suggestions for what to include from this lab in your final report.


You again need to write a detailed methods section. Include:

  • Final concentration of HCAII, DNSA, AZ
  • Equations for calculating for KD for both DNSA and AZ and make sure to define the values for Fmax and Fmin.


  • A graph of the fraction saturation (r) vs [DNSA]free, and graph of r vs [AZ]free
  • Describe the results of your plots in the text including relevant values
  • Be sure to include measurements of error and p-values, where appropriate


  • For which ligand, Dansyl amide or acetazolamide, does HCAII have a tighter affinity? By how much? Based upon the structure of DNSA and AZ, which would you expect to have higher affinity and why?
  • How do your KD values compare to that of the literature? What are some reasons why your values could differ from the published results?
  • How does the HCAII mutation you studied affect ligand binding? Discuss the relative affinity of DNSA and AZ to wt HCAII and the mutant. Your answer should include information about the chemistry of the amino acid in the wild type protein and the mutation you made as well as a statement about how the mutation affected the structure of the protein and thus its ability to bind the ligands. Use your results to support your conclusions.


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Biochemistry 551 (Online Version) Lab Manual Copyright © by Lynne PROST is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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