KIVO Med
Modulation of enzymatic activity
Understand how pH, temperature, ions, radiation, inhibitors, and activators modify an enzymatic reaction.
- 30 explained questions
- 26 flashcards
- 100 estimated course minutes
Updated
What you will learn
- Relate pH, temperature, ionic strength, and radiation to changes in enzyme conformation and activity.
- Define a chemical effector and distinguish reversible from irreversible inhibitors.
- Compare competitive, non-competitive, and uncompetitive inhibition using Km, Vmax, and Lineweaver–Burk plots.
- Describe metal ions, limited proteolysis, and covalent modifications as activation mechanisms.
- Relate irreversible thymidylate-synthase inhibition by 5-fluorouracil to arrest of tumour-cell proliferation.
Course outline
A map of enzyme modulation
Locate physical factors, chemical effectors, and activation mechanisms that regulate enzyme activity.
8 min
Temperature and pH
Understand the thermal optimum and the effects of ionisation on enzyme conformation.
13 min
Ionic strength and radiation
Relate ions, solubility, direct ionisation, and free radicals to enzyme modulation.
12 min
Chemical effectors and competitive inhibition
Define an effector, then follow reversible competitive binding at the active site and its kinetic consequences.
15 min
Non-competitive inhibition
Distinguish binding at another site and decreased $V_{max}$ without a change in $K_m$.
13 min
Uncompetitive inhibition
Analyse an inhibitor that binds only the enzyme–substrate complex and blocks product formation.
13 min
Irreversible inhibition and 5-fluorouracil
Relate covalent binding, permanent loss of activity, and a chemotherapy example to an enzyme target.
12 min
Enzyme activators
Compare activation by metal ions, limited proteolysis, and covalent modification.
14 min
Study and practise with KIVO Med
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Educational resources for medical studies; they do not replace your faculty’s teaching or medical advice.
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