The phosphoryl group on phosphoglucomutase is slowly lost by...

Key Concepts

Phosphoryl Transfer Mechanism

This refers to the process by which a phosphoryl group is transferred from one molecule to another, a fundamental reaction in many biological systems. It involves the movement of a phosphate group through the formation and cleavage of covalent bonds, often mediated by enzymes, and is critical in processes such as metabolic regulation and signal transduction.

Phosphoenzyme Intermediate

In many enzyme-catalyzed reactions, the enzyme temporarily forms a covalent bond with a phosphate group on an active site residue. This transiently phosphorylated form of the enzyme is known as a phosphoenzyme intermediate, which plays a key role in facilitating subsequent chemical transformations by transferring the phosphate group to/from substrates.

Bisphosphate Intermediate Formation

Some enzymes generate a bisphosphate intermediate during their catalytic cycle. In such cases, the enzyme transfers its phosphoryl group to a substrate, forming a substrate bisphosphate that can subsequently rephosphorylate the enzyme if the active site phosphate is lost. This intermediate is an essential component for regenerating the active phosphorylated form of the enzyme and maintaining catalytic turnover.

Catalytic Nucleophilic Attack and Regeneration

A key aspect of enzymatic phosphoryl transfer is the use of a nucleophilic residue, often within the active site, to attack and facilitate the transfer of a phosphoryl group. This nucleophilic attack not only drives the reaction but also plays a crucial role in reactivating the enzyme by restoring the phosphate group to the active site when it is lost through hydrolysis.

Transcript

00:01 Hello students and today we're going to be discussing about the phosphoral root on the phosphoral um glucomotus um sorry if i mispronounce that um in regards the chapter on glycogen metabolism and looking into it you probably seen um this diagram from a previous um from a previous drawing sorry if i realize for the other part i forgot to add the line that you notice for the bottom for the syrin that's my fault but basically what we see for the phosphoral leukomelostis strand or well that's the part that's on it i mean the phosphoral no group my bad that the main intention of this whole procedure is how a phosphonal group is transferred from the enzyme to the substrate.

01:13 And a different phosphoral group is transferred back to restore the enzyme to his initial state.

01:20 As you see down here, how this ends up entering, but this enters into this and how this part.

01:32 Is in turn where it removes this and replaces it with the h.

01:40 So why would this set up be important? well, the purpose of the mechanism is that it utilizes unknown catalyst intermediate for restoring this essential phosphonal group.

02:02 And the reason why and why it's so essential it because when you see the final stage when it comes to glucose 6 phosphate, the reason why it's really important is because the glucose 6 phosphate is a hydroly hydraulic enzyme, which enables the glucose to leave that organ and and how does that, this enzyme is able to, it cleaves the phosphonal group to form free glucose and orthyl phosphate.

02:44 And how it also releases free glucose at the conclusion of gluconeogenis.

02:56 And how a little bit more tip is that it's located on the loomogene.

03:03 Of the smoothy r membrane and how the glucose and orthophosphate is formed by hydro hydrolyzed the hydrolysis my bad and then it and then they are shuttled back into the cytoplasm so for hydrolysis if y 'all know it is basically that you use water to cut the enzyme or molecules...

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