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Vmax

Definition

The maximum initial velocity or rate of a reaction.


Supplement

In enzyme kinetics, Vmax is the maximum velocity or rate at which the enzyme catalyzed a reaction. It happens when all enzyme active sites are saturated with substrate.

Since the maximum velocity is described to be directly proportional to enzyme concentration, it can therefore be used to estimate enzyme concentration.


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Re: Lab of Vmax and KM

That's it. The velocity approaches Vmax asymptotically as the substrate concentration increases. However, changing other conditions can change the Michaelis–Menten plot -- for instance, a different pH or a different temperature can lead to ...

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by jonmoulton
Thu Jul 09, 2009 4:00 pm
 
Forum: Molecular Biology
Topic: Lab of Vmax and KM
Replies: 1
Views: 185

Lab of Vmax and KM

... I recorded 28 points with [S] (mM) and V (mM/min). I subsequently plotted two graphs (a Michaelis-Menten and Lineweaver burk) and calculated the Vmax and Km. Vmax = 0.005033 mM/min KM = 23.41 So that I completely understand: the maximum velocity this enzyme can react at is 0.005022 mM/min at ...

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by NewtoBiology
Thu Jul 09, 2009 5:34 am
 
Forum: Molecular Biology
Topic: Lab of Vmax and KM
Replies: 1
Views: 185

Enzyme kinetics

... by plotting the 1/[V] by 1/[S] graph, we may find the intercept on y axis....which is 1/Vm in this case....and then do the reciprocal to find out Vmax.....and then put this value in the above equation.....at a particular [S] and v....and find the value of Km....:)

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by setugoyal
Mon Jan 26, 2009 6:42 pm
 
Forum: Molecular Biology
Topic: Enzyme kinetics
Replies: 15
Views: 3904

Noncompetitive inhibition and allosteric inhibition

The two terms overlap to some extent. All "non-competitive" means is that the inhibitor lowers Vmax without changing Km. You can't read much mechanism into it. The notion of competitive, non-competitive, mixed-competitive are all kinetic behaviors. An allosteric site ...

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by blcr11
Thu Dec 25, 2008 12:17 pm
 
Forum: Molecular Biology
Topic: Noncompetitive inhibition and allosteric inhibition
Replies: 2
Views: 2025

Enzyme kinetics

Sorry, that should be X -intercept = -1/Km, not y-intercept. And the slope is Km/Vmax not Vmax. Memory didn't serve me very well this time and I was too lazy to derive it from the rate expression-though that's a useful excercise if you've never done it before. This ...

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by blcr11
Fri Dec 12, 2008 6:11 pm
 
Forum: Molecular Biology
Topic: Enzyme kinetics
Replies: 15
Views: 3904
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