At what point in glycolysis can ATP act as an inhibitor? What kind of enzyme regulation occurs i

At what point in glycolysis can ATP act as an inhibitor?...

Key Concepts

Glycolysis

Glycolysis is the biochemical pathway in which glucose is broken down into pyruvate, yielding energy in the form of ATP. This process is highly regulated to meet cellular energy demands and involves multiple steps, each catalyzed by specific enzymes.

Phosphofructokinase Regulation

Phosphofructokinase-1 (PFK-1) is a key regulatory enzyme in glycolysis. It catalyzes a rate-limiting step in the pathway and is subject to feedback control by various metabolites, including ATP, which acts as an inhibitor to prevent excessive accumulation of ATP and to modulate the rate of glycolysis according to cellular energy levels.

Allosteric Regulation

Allosteric regulation is a mechanism by which an enzyme's activity is modulated through the binding of regulatory molecules at sites other than the active site. In the case of PFK-1, ATP binds to an allosteric site, inducing a conformational change that reduces the enzyme's affinity for its substrate, thereby decreasing glycolytic flux when energy levels are high.

Transcript

00:04 Question number nine, at what point in glycolysis can adenocentrophosphate atp act as an inhibitor? what kind of enzyme regulation occurs in this inhibition? step 9 is further down here toward the latter part of our flow chart, moving from phosphoanil pyruvit to the keto form pyruvit.

00:34 So in step 9 we see the formation of atp, and this occurs in the presence of 2 positive magnesium and the enzyme pyruvitkinis.

00:50 Now pyruvid kinus is the enzyme that facilitates or allows for the conversion of phosphonal pyruvit to form pyruvit.

01:06 So basically it removes, we see that there is no phospho -denotation in this word, so it has removed the last phosphate group that was in the anul pyruvit.

01:22 Now, what we need to understand is the way this enzyme works.

01:28 This enzyme, this enzyme is geared toward forming more, more of the atp.

01:38 It wants to form.

01:39 Form more atp.

01:43 So how does it do that? if you, if you, if you want to form something, or if you have a need to form something, it means that you were first lacking in that thing that you are wanting to form, correct? so, so let's say, let's say, well, you're, you're hungry.

02:05 You need, you need to eat so that you can regain your strength.

02:11 So basically you go out and you get some food and you eat so that you can replenish your strength.

02:21 Well, the very same thing here, and actually this relates directly to something that we're talking about.

02:26 We need to get energy.

02:31 But if you are full, then you don't really have a need.

02:36 Is very unlikely that you are going to go at all lengths to get some food because you are not hungry...

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