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Related Concept Videos

Catalytically Perfect Enzymes01:07

Catalytically Perfect Enzymes

The theory of catalytically perfect enzymes was first proposed by W.J. Albery and J. R. Knowles in 1976. These enzymes catalyze biochemical reactions at high-speed. Their catalytic efficiency values range from 108-109 M-1s-1. These enzymes are also called 'diffusion-controlled' as the only rate-limiting step in the catalysis is that of the substrate diffusion into the active site. Examples include triose phosphate isomerase, fumarase, and superoxide dismutase.

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Non-complexed four cascade enzyme mixture: simple purification and synergetic co-stabilization.

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  • 1Biological Systems Engineering Department, Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, Virginia, United States of America.

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Summary

Stabilizing enzymes for cell-free biosystems is key for biomanufacturing. Adding other proteins significantly enhanced the stability of thermolabile phosphoglucose isomerase (PGI), improving enzyme performance.

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Area of Science:

  • Biotechnology
  • Biocatalysis
  • Protein Engineering

Background:

  • Cell-free biosystems offer advantages for biomanufacturing, including high yield and fast reaction rates.
  • Enzyme cost and stability are critical challenges for the economic viability of these systems.
  • Enzymes from thermophilic microorganisms are often explored for enhanced stability.

Purpose of the Study:

  • To investigate the stability of four recombinant enzymes from thermophilic microorganisms for potential biomanufacturing applications.
  • To determine the factors affecting the stability of thermolabile enzymes in cell-free systems.
  • To enhance the stability and performance of phosphoglucose isomerase (PGI).

Main Methods:

  • Purification of recombinant triosephosphate isomerase (TIM), fructose bisphosphate aldolase (ALD), fructose bisphosphatase (FBP), and phosphoglucose isomerase (PGI).
  • Assessment of enzyme stability under various conditions, including heat treatment and presence of other proteins.
  • Evaluation of enzyme half-life and total turnover number.

Main Results:

  • TIM and ALD demonstrated high stability and could be purified via heat and ammonia sulfate precipitation.
  • PGI exhibited insufficient stability for heat treatment.
  • The stability of PGI was significantly enhanced (over 25 times) by bovine serum albumin or the presence of the other three enzymes.
  • In a mixture, PGI's half-life extended to 433 hours, increasing its total turnover number to 6.2×10^9.

Conclusions:

  • The presence of other proteins exerts a synergistic stabilizing effect on thermolabile enzymes like PGI through in vitro macromolecular crowding.
  • This macromolecular crowding effect explains why some enzymes from thermophilic organisms may lack stability in vitro.
  • Strategies to enhance enzyme stability in cell-free systems are crucial for advancing biomanufacturing platforms.