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Magic Bullets

A Case on Enzyme Inhibition


Sarah A. Wojiski
Genomic Education
The Jackson Laboratory


This clicker case was designed to teach students about basic enzyme structure, mechanisms of enzyme inhibition, and mechanisms of drug resistance. The story follows Oliver Casey, a patient afflicted with Chronic Myelogenous Leukemia (CML). CML is caused by a chromosomal mutation that affects the tyrosine kinase ABL, an enzyme important in regulating cell growth and proliferation. The chromosomal mutation gives rise to the BCR-ABL fusion gene that produces a constitutively active ABL kinase, which causes the leukemia. In May 2001, the Food and Drug Administration approved the use of a rationally designed tyrosine kinase inhibitor, imatinib (Gleevec®), for the treatment of CML. During that same month, Gleevec made the cover of TIME magazine, described as "new ammunition in the war on cancer." The case is structured for a flipped classroom environment in which students view preparatory videos (including one by the author) on their own before beginning the case. Written for a first-year introductory biology course, the case could also be adapted for AP/Honors high school biology or a cancer biology course.


  • Define catalyst and describe the role of enzymes in biological systems.
  • Define substrate and active site, and explain the "induced fit" model of enzyme-substrate interactions.
  • Explain how different factors in the cellular environment, such as pH and temperature, affect enzyme activity.
  • Distinguish between competitive and non-competitive inhibition, and explain how competitive and non-competitive inhibitors alter an enzyme's activity.
  • Describe how enzyme inhibition can be used to treat certain forms of cancer.
  • Explain how mutations can lead to resistance to enzyme inhibition.


Enzyme; enzyme inhibition; induced fit; kinase; leukemia; active site; substrate; competitive inhibition; chronic myelogenous leukemia; CML; hematopoiesis; Philadelphia chromosome; Gleevec; resistance

Topical Areas


Educational Level

High school, Undergraduate lower division


PDF, PowerPoint

Type / Methods

Clicker, Flipped



Subject Headings

Biology (General)  |   Cell Biology  |   Medicine (General)  |  

Date Posted


Teaching Notes

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Answer Key

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The following video(s) are recommended for use in association with this case study.

  • Animated Tutorial: BCR-ABL: Cancer Protein Structure and Function hhmi/
    This self-paced animated tutorial (Click and Learn) supports the 2013 Holiday Lectures on Science and describes how understanding the structure of the BCR-ABL kinase led to the development of an effective treatment for chronic myeloid leukemia. It provides an example of how advances in molecular biology, structural biology, and DNA sequencing have revolutionized the treatment of certain types of cancer. Produced by HHMI BioInteractive.
  • Animation: Gleevec Inhibits Cancer-Causing Kinase BCR-ABL hhmi/
    This short animation explains the mechanism of the the drug Gleevec and how it binds to and inactivates BCR-ABL, a mutant kinase that causes chronic myeloid leukemia. Running time: 3:31 min. Produced by HHMI BioInteractive.
  • Animation: Gleevec-Resistant Form of Kinase BCR-ABL hhmi/
    This animation describes the mechanism of the drug, dasatinib. Dasatinib is used to treat Gleevec resistant CML. Running time: 2:14 min. Produced by HHMI BioInteractive.
  • Animation: Gleevec hhmi/
    This animation shows how the drug Gleevec is designed to interfere with the stimulation of growth in leukemia cells. Running time: 1:04 min. Produced by HHMI BioInteractive.
  • Lecture: Cancer As a Genetic Disease hhmi/
    Lecture from the 2013 HHMI Holiday Lecture Series. Dr. Sawyers presents an overview of cancer biology and describes how understanding the molecular mechanisms involved in a type of cancer, chronic myeloid leukemia, resulted in the development of Gleevec, one of the first targeted cancer drugs. Running time: 58:33 min. Produced by HHMI BioInteractive.
  • Enzyme Function and Inhibition (with audio narration)
    A brief narrated animation describing basic enzyme structure (active site, substrate) and competitive versus non-competitive inhibition. Running time: 1:07 min. Produced by JubbaTheHott, uploaded to YouTube in 2009.
  • Enzymes and … Pac-Man?
    Funny animation making an analogy between enzymes and Pac-Man from the vintage video game. It discusses active site, substrate, optimal temperature/pH, and denaturation. Running time: 4:50 min. Produced by the Amoeba Sisters, 2013.
  • Enzyme Function and Inhibition
    An animation describing the basic structure of an enzyme and the environmental factors that influence proper enzyme folding. The induced fit model of enzyme-substrate interaction is demonstrated, and competitive and non-competitive inhibition are described, including real-world examples of each. Running Time: 5:13 min. Produced by Sarah A. Wojiski for the National Center for Case Study Teaching in Science, University at Buffalo, 2015.


Gian Toyos
Saint John's School
San Juan
Great activity. Used it with my AP Bio class. First assigned metabolism chapter. Quick discussion. Then used this activity to apply what they had learned. Ready for a quiz. Thanks for sharing it.