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Related Concept Videos

Pyruvate Oxidation01:15

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After glycolysis, the charged pyruvate molecules enter the mitochondria via active transport and undergo three enzymatic reactions. These reactions ensure that pyruvate can enter the next metabolic pathway so that energy stored in the pyruvate molecules can be harnessed by the cells.
First, the enzyme pyruvate dehydrogenase removes the carboxyl group from pyruvate and releases it as carbon dioxide. The stripped molecule is then oxidized and releases electrons, which are then picked up by NAD+...
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Phosphorylation01:02

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The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
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Here, in contrast to the E2 reaction mechanism, we delve into the aspects of the E1 reaction mechanism, which has two steps: rate-limiting loss of the leaving group and abstraction of the beta hydrogen by a weak base. Typically, the experimental proof for the E1 mechanism is via kinetic studies or isotope studies. While the former demonstrates the first-order kinetics—the dependence of the reaction solely on substrate concentration—the latter proves the abstraction of hydrogen only...
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E1 Reaction: Stereochemistry and Regiochemistry02:43

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One of the critical aspects of the E1 reaction mechanism, as also observed in E2, is the regiochemistry, with multiple regioisomers obtained as products. In the example discussed, the presence of water as a weak base favors elimination over substitution to generate two alkenes. Given that alkenes’ stability increases with the number of alkyl groups across the double bond, typically, E1 reactions lead to the Zaitsev product, for this is more substituted and stable than the Hofmann product.
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How phosphorylation influences E1 subunit pyruvate dehydrogenase: A computational study.

Jacopo Sgrignani1,2, JingJing Chen3, Andrea Alimonti3

  • 1Institute for Research in Biomedicine (IRB), Università della Svizzera Italiana (USI), Via Vincenzo Vela 6, CH-6500, Bellinzona, Switzerland. jacopo.sgrignani@irb.usi.ch.

Scientific Reports
|October 4, 2018
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Summary
This summary is machine-generated.

Phosphorylation of pyruvate dehydrogenase complex (PDC) subunits Ser-264-α and Ser-271-α inhibits its function by altering the catalytic site and reducing substrate affinity, crucial for cancer cell metabolism.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • The pyruvate dehydrogenase complex (PDC) is vital for cellular metabolism, regulating carbon entry into the Krebs cycle.
  • PDC comprises E1, E2, and E3 subunits, catalyzing pyruvate to acetyl-CoA conversion.
  • PDC's role in cancer cell replication and survival has recently garnered significant scientific interest.

Purpose of the Study:

  • To investigate the impact of post-translational modifications, specifically phosphorylation of serine residues, on PDC enzymatic function.
  • To elucidate the mechanism by which phosphorylation at Ser-264-α, Ser-271-α, and Ser-203-α affects PDC activity.

Main Methods:

  • Molecular dynamics simulations were employed to study the enzymatic mechanism.
  • Analysis focused on the structural and dynamic changes within the catalytic site.
  • Investigated the influence of phosphorylation on substrate-binding affinity and pathway accessibility.

Main Results:

  • Phosphorylation of Ser-264-α and Ser-271-α perturbs the catalytic site structure and dynamics.
  • Phosphorylation, particularly at Ser-264-α, reduces the affinity of the E1 subunit for its substrate.
  • Inhibitory effects are not attributed to the blockage of substrate access or product egress pathways.

Conclusions:

  • Phosphorylation of specific serine residues in PDC acts as a regulatory mechanism influencing enzymatic activity.
  • Altered catalytic site dynamics and reduced substrate affinity are key consequences of this phosphorylation.
  • Findings provide insights into PDC regulation in cancer cells and potential therapeutic targets.