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Biosynthesis in bacteria is a fundamental anabolic process that generates essential macromolecules, including proteins, nucleic acids, lipids, and polysaccharides. These macromolecules are critical for cellular growth, replication, and function. The process is tightly regulated and energetically linked to catabolic pathways to ensure optimal resource utilization.Biosynthetic pathways begin with precursor metabolites such as pyruvate, acetyl-CoA, and glucose-6-phosphate derived from glycolysis,...
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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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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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Microorganisms rely on proteins as an essential carbon and energy source, particularly in environments with limited polysaccharides or lipids. However, proteins are too large to cross the plasma membrane unaided, necessitating enzymatic degradation. Microbes secrete extracellular proteases and peptidases that hydrolyze proteins into peptides, which can then be transported across the membrane. Once inside the cell, intracellular proteases degrade these peptides into free amino acids, which...
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Combing Directed Enzyme Evolution with Metabolic Engineering to Develop Efficient Microbial Cell Factories.

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  • 1Division of Biotechnology, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.

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Summary
This summary is machine-generated.

Synthetic biology and metabolic engineering use microbial cell factories for sustainable chemical production. Protein engineering and directed evolution optimize enzymes, enhancing microbial production beyond traditional methods.

Keywords:
Protein engineeringartificial intelligencedirected evolutionin vivo evolutionmetabolic engineering

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Area of Science:

  • Synthetic biology
  • Metabolic engineering
  • Protein engineering

Background:

  • Metabolic engineering traditionally focuses on gene expression and enzyme levels.
  • Enzyme properties are often overlooked, limiting microbial cell factory optimization.
  • Synthetic biology offers sustainable chemical manufacturing using renewable feedstocks.

Purpose of the Study:

  • To review traditional and data-driven directed evolution strategies.
  • To discuss applications of directed evolution in metabolic engineering.
  • To explore challenges and future prospects of protein engineering in metabolic engineering.

Main Methods:

  • Directed evolution techniques: random library design, semirational design, smart library design, and in vivo continuous evolution.
  • Integration of protein engineering with metabolic engineering.
  • Analysis of strategies for achieving superphenotypes.

Main Results:

  • Directed evolution enables optimization of enzyme properties for improved metabolic fluxes.
  • These strategies lead to highly efficient metabolic pathways and industrial chassis.
  • Superphenotypes unattainable by gene manipulation alone can be achieved.

Conclusions:

  • Protein engineering and directed evolution are crucial for advancing microbial cell factories.
  • Addressing challenges in protein engineering will accelerate synthetic biology applications.
  • Future prospects involve state-of-the-art technologies to enhance directed evolution workflows.