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Cellular needs and conditions vary from cell to cell and change within individual cells over time. For example, the required enzymes and energetic demands of stomach cells are different from those of fat storage cells, skin cells, blood cells, and nerve cells. Furthermore, a digestive cell works much harder to process and break down nutrients during the time that closely follows a meal compared with many hours after a meal. As these cellular demands and conditions vary, so do the amounts and...
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Metabolism encompasses all biochemical reactions in a living organism, facilitating both the breakdown and synthesis of biomolecules. These metabolic processes are categorized into catabolic and anabolic pathways, which operate in a coordinated manner to ensure energy balance and cellular function.Catabolic Pathways and Energy ReleaseCatabolic pathways involve the breakdown of complex macromolecules such as carbohydrates, lipids, and proteins into smaller structures like monosaccharides, fatty...
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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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Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
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The operon model represents a fundamental mechanism of gene regulation in prokaryotes, enabling coordinated expression of genes involved in related metabolic or functional pathways. Operons consist of structural genes, a promoter, and an operator, with transcription regulated by repressors, activators, and small effector molecules.Structure and Function of OperonsAn operon is a cluster of structural genes transcribed together under the control of a single promoter. The promoter region...
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Rapid Assembly of Multi-Gene Constructs using Modular Golden Gate Cloning
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Type IIs restriction based combinatory modulation technique for metabolic pathway optimization.

Lijun Ye1,2, Ping He1,2,3, Qingyan Li1,2

  • 1Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, People's Republic of China.

Microbial Cell Factories
|March 18, 2017
PubMed
Summary
This summary is machine-generated.

Researchers developed a Type IIs restriction based combinatory modulation (TRCM) technique to optimize metabolic pathways. This method efficiently balances the mevalonate pathway in E. coli, doubling beta-carotene yield.

Keywords:
MVA pathwayMetabolic pathway optimizationTerpeneType IIs restrictionβ-carotene

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Area of Science:

  • Metabolic Engineering
  • Synthetic Biology
  • Biotechnology

Background:

  • Achieving a balanced metabolic pathway is crucial for efficient cell factory development in metabolic engineering.
  • Current methods for simultaneous multi-gene expression modulation and optimization are limited.

Purpose of the Study:

  • To develop a simple and efficient technique for simultaneous modulation of multiple gene expressions.
  • To select for optimal gene regulation patterns in metabolic pathways.
  • To enhance beta-carotene production in engineered E. coli.

Main Methods:

  • A Type IIs restriction based combinatory modulation (TRCM) technique was designed and established.
  • A plasmid library with variably regulated mevalonate (MVA) pathway genes (mvaE, mvaS, mvaK1, mvaD, mvaK2) was constructed.
  • The library was transformed into E. coli to create a beta-carotene producer library, followed by color-based pre-screening.

Main Results:

  • The TRCM technique achieved a 100% plasmid assembly rate after color-based pre-screening.
  • Sequencing confirmed diverse ribosomal binding site (RBS) designs for MVA pathway gene regulation.
  • A balanced MVA pathway was achieved, resulting in a two-fold increase in beta-carotene yield.

Conclusions:

  • The TRCM technique provides an effective platform for metabolic pathway optimization.
  • This method is applicable to various metabolic engineering applications requiring precise gene regulation.
  • The study demonstrates a successful strategy for enhancing valuable compound production in microbial cell factories.