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Catalytically Perfect Enzymes

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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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A New Screening Method for the Directed Evolution of Thermostable Bacteriolytic Enzymes

A New Screening Method for the Directed Evolution of Thermostable Bacteriolytic Enzymes

Published on: November 7, 2012

Enhancing catalytic efficiency of two microbial uricases making by directed evolution.

Xiaoyuan Tang¹, Liling Qin¹, Yuze Xia¹

¹Department of Biological Medicines & Shanghai Engineering Research Center of Immunotherapeutics, Fudan University School of Pharmacy, 826 Zhangheng Road, Pudong, Shanghai 201203, PR China.

International Journal of Biological Macromolecules

|February 1, 2025

Summary

Researchers engineered novel uricase enzyme mutants from Aspergillus flavus and Candida utilis, achieving record-high enzymatic activity for potential hyperuricemia and gout treatments.

Keywords:

Directed evolution Uric acid Uricase

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Mutagenesis and Functional Selection Protocols for Directed Evolution of Proteins in E. coli

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Published on: March 16, 2011

Area of Science:

Biochemistry
Enzymology
Metabolic Disorders

Background:

Uricase is crucial in purine metabolism, converting uric acid to allantoin.
It is therapeutically used for hyperuricemia and gout treatment.
Enhancing uricase activity is vital for improved therapeutic efficacy.

Purpose of the Study:

To generate and characterize uricase mutants with significantly enhanced enzymatic activity.
To identify key mutations responsible for increased uricase function.
To evaluate the in vivo therapeutic potential of engineered uricase.

Main Methods:

Utilized error-prone PCR and high-throughput screening for mutant generation.
Employed site-directed mutagenesis to confirm key amino acid substitutions.
Conducted in vivo experiments to assess clinical applicability.

Main Results:

Developed Aspergillus flavus uricase mutant (af-UA^M) with 46.21 U/mg activity.
Developed Candida utilis uricase mutant (cu-UA^M) with 31.43 U/mg activity.
Identified Thr231Ala and Val234Met substitutions as critical for enhanced activity.

Conclusions:

Achieved highest reported uricase activities to date through protein engineering.
Established structure-function relationships for improved uricase design.
Demonstrated significant therapeutic potential for hyperuricemia treatment.