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Catalytically Perfect Enzymes

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.

Most enzymes...

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Related Experiment Video

Updated: Jun 23, 2025

Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase

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A Cost-Effective Hemin-Based Artificial Enzyme Allows for Practical Applications.

Dehui Qiu¹, Fangni He¹, Yuan Liu¹

¹State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|June 26, 2024

Summary

Researchers developed a novel artificial enzyme, assembly-activated hemin enzyme (AA-heminzyme), mimicking natural enzymes. This cost-effective nanomaterial offers superior stability and efficiency for applications like wastewater treatment and biomarker detection.

Keywords:

G‐quadruplex artificial enzyme hemin histidine analogs

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Area of Science:

Biomimetic chemistry
Nanomaterials science
Catalysis

Background:

Natural enzymes offer valuable catalytic functions but have limitations in stability and cost.
Nanomaterials provide a platform for creating artificial enzymes with enhanced properties.

Purpose of the Study:

To design and characterize a novel artificial enzyme, assembly-activated hemin enzyme (AA-heminzyme), using hemin, histidine analogs, and G-quadruplex DNA.
To evaluate the catalytic efficiency, stability, and economic viability of AA-heminzyme compared to natural enzymes.

Main Methods:

In silico investigations including molecular docking and quantum chemical calculations.
In vitro catalytic assays comparing AA-heminzyme with horseradish peroxidase (HRP).
Assessment of thermal stability, recoverability, and cost-effectiveness.

Main Results:

AA-heminzyme demonstrated comparable catalytic efficiency to HRP, with a turnover number (kcat) of 115 s⁻¹.
The artificial enzyme exhibited superior thermal stability, recoverability, and editability.
AA-heminzyme's catalytic cost was less than 10% of HRP's cost.

Conclusions:

AA-heminzyme represents a highly efficient, stable, and economically viable biomimetic catalyst.
Its strategic potential is confirmed for industrial wastewater remediation and cost-effective biomarker detection, such as glutathione analysis.