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Fates of Pyruvate01:20

Fates of Pyruvate

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Pyruvate is the end product of glycolysis, where glucose is oxidized to pyruvate, simultaneously reducing NAD+ to NADH. Two molecules of ATP are also produced by substrate-level phosphorylation.
In aerobic organisms, pyruvate is metabolized via the citric acid cycle to produce reduced coenzymes NADH and FADH2. These coenzymes are then oxidized in the electron transport chain to produce ATP and, in the process, regenerate the NAD+ and FAD. As seen in some cell types and organisms, fermentation...
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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.
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The pentose phosphate pathway (PPP) operates in parallel with glycolysis, facilitating the metabolism of both pentoses and glucose. This pathway consists of two distinct phases: the oxidative and non-oxidative phases. While it does not directly generate ATP, the intermediates formed during the process can integrate into glycolysis, contributing to cellular energy metabolism when required.Oxidative Phase: NADPH ProductionThe oxidative phase of the pentose phosphate pathway is primarily...
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Cellular respiration is a fundamental metabolic process that enables organisms to generate energy from organic molecules. One of its central pathways is the tricarboxylic acid (TCA) cycle, also known as the Krebs cycle, which plays a crucial role in energy production and biosynthetic processes.Conversion of Pyruvate to Acetyl-CoAThe pyruvate generated from glycolysis undergoes oxidative decarboxylation by the pyruvate dehydrogenase complex, producing acetyl-CoA, one molecule of NADH, and one...
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Fermentation is a crucial anaerobic metabolic process that enables microbes to derive energy from sugar without relying on oxygen or an electron transport chain. This process is fundamental to various biological and industrial applications and is classified based on the metabolic products generated.Role of Pyruvate in FermentationPyruvate and its derivatives serve as key electron acceptors in fermentative pathways. The oxidation of NADH to regenerate NAD+ is essential for the continuation of...
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Pyruvate production using engineered Escherichia coli.

Hironaga Akita1, Nobutaka Nakashima2,3, Tamotsu Hoshino1,4

  • 1Research Institute for Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), 3-11-32 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-0046, Japan.

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|October 9, 2016
PubMed
Summary
This summary is machine-generated.

Researchers engineered Escherichia coli for high pyruvate production by manipulating genes involved in fatty acid biosynthesis and central carbon metabolism. This engineered strain achieved a high pyruvate concentration, showing potential for industrial applications.

Keywords:
DoxycyclineEscherichia coliFermenterPromoter regulationPyruvateTetracycline

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Area of Science:

  • Biotechnology
  • Metabolic Engineering
  • Microbial Fermentation

Background:

  • Pyruvate is crucial for central carbon metabolism and industrial applications.
  • Current fermentation methods for pyruvate production require optimization for efficiency.

Purpose of the Study:

  • To develop a simple and efficient method for high-yield pyruvate production in Escherichia coli.
  • To engineer a microbial strain for industrial-scale pyruvate synthesis.

Main Methods:

  • Genomic manipulation of accBC genes using a tetracycline-regulated promoter to control fatty acid biosynthesis.
  • Deletion of multiple genes (ackA-pta, adhE, cra, ldhA, pflB, poxB) and introduction of a tetracycline-regulated promoter upstream of aceE.
  • Optimization of culture conditions for the engineered pyruvate-producing strain.

Main Results:

  • Engineered Escherichia coli strain (LAFCPCPt-accBC-aceE) demonstrated controlled growth based on doxycycline presence.
  • Achieved a final pyruvate concentration of 26.1 g L⁻¹ after 72 hours.
  • Reached a theoretical yield of 55.6% for pyruvate production.

Conclusions:

  • The developed engineered strain shows significant potential for industrial pyruvate production.
  • Metabolic engineering strategies can effectively enhance pyruvate yields in Escherichia coli.
  • Controlled gene expression is a viable approach for optimizing microbial fermentation processes.