Question regarding Michaelis-menten plot and equation

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SUMMARY

The discussion centers on analyzing a Michaelis-Menten plot to determine its fit with the chemical rate equation J=JMAX ([S] / (KM + [S])). Participants suggest selecting a value of J from the plot and substituting it into the equation to verify consistency. They emphasize the importance of transforming the equation into a linear form for better analysis, despite the recommendation against using large values of S (S >> Km) for fitting. The conversation highlights the need for practical methods to derive constants from experimental data.

PREREQUISITES
  • Understanding of Michaelis-Menten kinetics
  • Familiarity with the equation J=JMAX ([S] / (KM + [S]))
  • Basic skills in curve fitting and linear regression
  • Proficiency in using scientific calculators for data analysis
NEXT STEPS
  • Learn how to transform Michaelis-Menten equations for linear regression analysis
  • Study methods for calculating best-fit lines using statistical software
  • Explore the implications of using large substrate concentrations in enzyme kinetics
  • Investigate common pitfalls in experimental data interpretation in biochemistry
USEFUL FOR

Biochemists, students studying enzyme kinetics, and researchers analyzing experimental data related to enzyme activity will benefit from this discussion.

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Homework Statement



I have a michaelis-menten plot and I need to see if it fits the chemical rate equation.

Homework Equations



J=JMAX ( / KM + )

The Attempt at a Solution



I can get values for the entire equation from the plot. My idea was to choose a value of J and insert the relevant values into the equation. then compare the solution to my chosen value of J. Does this make sense? i have a feeling there is some major mathematical flaw somewhere!
 
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wh00pwh00p said:

Homework Statement



I have a michaelis-menten plot and I need to see if it fits the chemical rate equation.

Not sure what that means, does it mean you have some experimental points?

Homework Equations



J=JMAX ( / (KM + )

The Attempt at a Solution



I can get values for the entire equation from the plot. My idea was to choose a value of J and insert the relevant values into the equation. then compare the solution to my chosen value of J. Does this make sense? i have a feeling there is some major mathematical flaw somewhere!



For a reasonably good idea at least, what is J when S is large, S>>Km ?

Although this is not usually recommended for fitting the curve.

I can't believe they have thrown this task at you and nowhere in your handouts or books is there any idea of how you home in on these constants. It is in almost every My First Book Of Biochemistry.

But if you really have to work it out, you are supposed to transform your equation into one of several forms where you can plot one parameter calculated from the experiments against another and the result is a straight line if your equation is obeyed. You then find - calculate with a scientific calculator - the straight line that best fits the points. However if you don't know how to do this best fit, drawing the best line by eye with ruler is (secret) just as good for now, though frowned on by academics and journals of a certain level.
 

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