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María Inmaculada García-García1, Agustín Sola-Carvajal, Guiomar Sánchez-Carrón

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|March 8, 2011
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Improved enzyme immobilization using FastPrep-CLEAs significantly boosts N-acetyl-D-neuraminic acid production. This method enhances enzyme activity and stability, making biocatalysis more cost-effective and sustainable for sialic acid synthesis.

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Area of Science:

  • Biocatalysis and Enzyme Engineering
  • Biotechnology and Industrial Microbiology

Background:

  • N-acetyl-D-neuraminic acid (sialic acid) is a crucial component in various biological processes and therapeutic applications.
  • Efficient biotechnological production of sialic acid relies on key enzymes like N-acetyl-D-neuraminic acid aldolase.
  • Enzyme immobilization is vital for enhancing enzyme stability, reusability, and overall process efficiency in biocatalysis.

Purpose of the Study:

  • To develop an improved method for immobilizing N-acetyl-D-neuraminic acid aldolase using cross-linked enzyme aggregates (CLEAs).
  • To enhance the recovery and activity of immobilized aldolase for efficient N-acetyl-D-neuraminic acid synthesis.
  • To evaluate the biotechnological feasibility and operational stability of the novel immobilized enzyme preparation.

Main Methods:

  • Immobilization of N-acetyl-D-neuraminic acid aldolase via precipitation with ammonium sulfate and crosslinking with glutaraldehyde.
  • Development of enhanced FastPrep-CLEAs by co-aggregation with bovine serum albumin and sodium borohydride treatment.
  • Assessment of enzyme activity recovery, stability at alkaline pH, substrate kinetics (K(M)), and operational stability.

Main Results:

  • The novel FastPrep-CLEAs method achieved up to 86% enzyme activity recovery, a twofold increase compared to standard CLEAs.
  • This activity is 30% higher than previously reported for cross-linked inclusion bodies (CLIBs) of this aldolase.
  • FastPrep-CLEAs demonstrated excellent stability at alkaline pH, favorable substrate kinetics, and good operational stability for N-acetyl-D-neuraminic acid synthesis.

Conclusions:

  • FastPrep-CLEAs represent a highly effective strategy for immobilizing N-acetyl-D-neuraminic acid aldolase, significantly improving enzyme performance.
  • The enhanced immobilization technique offers a practical and cost-effective approach for the industrial biocatalytic production of sialic acid.
  • This method promotes enzyme reusability and reduces production costs, making it attractive for biotechnological applications.