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Related Concept Videos

Introduction to Enzymes01:22

Introduction to Enzymes

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The use of enzymes by humans dates to 7000 BCE. Humans first used enzymes to ferment sugars and produce alcohol without knowing that this was an enzyme-catalyzed reaction. Wilhelm Kuhne coined the term 'enzyme' in 1877 from the Greek words ‘en’ meaning ‘in’ or ‘within’ and ‘zyme’ meaning ‘yeast.’
Most enzymes are proteins that speed up biochemical reactions without being consumed. Enzymes contain one or more active sites that...
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Introduction to Enzyme Kinetics01:19

Introduction to Enzyme Kinetics

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Enzyme kinetics studies the rates of biochemical reactions. Scientists monitor the reaction rates for a particular enzymatic reaction at various substrate concentrations. Additional trials with inhibitors or other molecules that affect the reaction rate may also be performed.
The experimenter can then plot the initial reaction rate or velocity (Vo) of a given trial against the substrate concentration ([S]) to obtain a graph of the reaction properties. For many enzymatic reactions involving a...
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Catalytically Perfect Enzymes01:07

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.
 
Most enzymes...
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Introduction to Mechanisms of Enzyme Catalysis01:13

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For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes...
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Turnover Number and Catalytic Efficiency01:19

Turnover Number and Catalytic Efficiency

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The turnover number of an enzyme is the maximum number of substrate molecules it can transform per unit time. Turnover numbers for most enzymes range from 1 to 1000 molecules per second. Catalase has the known highest turnover number, capable of converting up to 2.8×106 molecules of hydrogen peroxide into water and oxygen per second. Lysozyme has the lowest known turnover number of half a molecule per second.
Chymotrypsin is a pancreatic enzyme that breaks down proteins during digestion....
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E2 Reaction: Kinetics and Mechanism02:45

E2 Reaction: Kinetics and Mechanism

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SN2 substitutions and E2 eliminations of alkyl halides proceed via a concerted pathway. While the nucleophile attacks the alpha carbon in SN2 reactions, it functions as a strong base and abstracts a beta hydrogen in the E2 mechanism. The rate-limiting transition state in E2 elimination reactions is characterized by partially broken carbon–hydrogen and carbon–halogen bonds and a partially formed pi bond between the alpha and beta carbons. The beta hydrogen and halide are eliminated...
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Hot Biological Catalysis: Isothermal Titration Calorimetry to Characterize Enzymatic Reactions
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zERExtractor: An Automated Platform for Enzyme-Catalyzed Reaction Data Extraction from Scientific Literature.

Rui Zhou1,2, Haohui Ma3, Tianle Xin4

  • 1Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China.

Journal of Chemical Information and Modeling
|March 17, 2026
PubMed
Summary

zERExtractor accurately extracts enzyme reaction data from scientific texts, tables, and images. This platform enhances enzyme activity prediction models by structuring previously inaccessible enzymatic reaction relationships.

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Area of Science:

  • Biotechnology
  • Computational Enzymology
  • Bioinformatics

Background:

  • The exponential growth in enzyme reaction literature presents a significant challenge for database curation.
  • Vast amounts of enzyme-substrate-condition data remain unstructured, limiting their use in deep learning (DL) models for enzyme activity prediction.
  • Existing DL-based data extraction methods often lack fidelity checks and continuous evolution capabilities.

Purpose of the Study:

  • To develop an accurate and extensible platform, zERExtractor (Zelixir's Enzyme Reaction Data Extractor), for extracting enzyme-catalyzed reaction data from scientific publications.
  • To create a unified multimodal information extraction framework capable of processing molecular reaction diagrams, tables, and text.
  • To integrate enzymatic reaction descriptors into structured storage for improved DL-driven modeling.

Main Methods:

  • Implementation of a human-in-the-loop pipeline utilizing fine-tuned large language models (LLMs) and DL.
  • Integration of data fidelity validation by experts and active learning for continuous model evolution.
  • Development of a multimodal information extraction framework covering molecular diagrams, tables, and text.

Main Results:

  • zERExtractor achieved 89.9% accuracy in table recognition and over 98% accuracy in molecular image recognition on synthetic datasets.
  • The platform outperformed the strongest baseline by more than 2% on synthetic data.
  • Consistent performance above 95% accuracy was maintained on realistic benchmarks.

Conclusions:

  • zERExtractor effectively bridges the data gap in enzyme reaction information.
  • The platform provides a scalable framework for accurate multimodal data extraction.
  • This advancement supports DL-driven enzyme modeling, computational enzymology, and biotechnology applications.