What Is the Michaelis-Menten & Lineweaver-Burk Inhibition Calculator?
Michaelis-Menten kinetics model the hyperbolic relationship between enzymatic rate and substrate concentration.
Lineweaver-Burk plots linearize this relationship into reciprocal space to diagnose drug inhibition modes.
How Does the Michaelis-Menten & Lineweaver-Burk Inhibition Calculator Work?
Applies the modifier factor alpha = 1 + [I]/Ki.
Modifies Km and Vmax based on competitive, uncompetitive, or noncompetitive rules.
Computes the instantaneous reaction velocity and Lineweaver-Burk slope.
Michaelis-Menten & Lineweaver-Burk Inhibition Calculator Formula & Variables
The core mathematical equation utilized by this calculator is expressed as:
Lineweaver-Burk double reciprocal transformation of Michaelis-Menten inhibition kinetics.
How to Use the Michaelis-Menten & Lineweaver-Burk Inhibition Calculator
- Enter uninhibited Vmax and Km values.
- Specify current substrate concentration and inhibitor concentration.
- Select the inhibition mechanism from the dropdown.
Step-by-Step Example Calculation
Competitive Kinase Inhibitor Assay
Input Values:
Understanding Your Result
Initial velocity indicates actual catalytic rate in the presence of inhibitor.
Apparent Km reflects changes in substrate affinity caused by inhibitor binding.
Factors That Affect the Result
- Inhibitor affinity: Lower Ki values indicate stronger, more potent binding.
- Substrate competition: Competitive inhibitors can be overcome by high substrate concentrations.
When Should You Use This Calculator?
- Pharmacological drug discovery and enzyme characterization.
- Distinguishing drug binding modes during lead optimization assays.
Assumptions & Limitations
- Assumes quasi-steady-state conditions with substrate concentration vastly exceeding enzyme concentration.
- Assumes reversible, rapid-equilibrium inhibitor binding.
Frequently Asked Questions
Calculation Accuracy & Reference Note
Closed-form algebraic formulation aligns with standard enzyme kinetics textbooks.