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Related Concept Videos

Enzymes02:34

Enzymes

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Inside living organisms, enzymes act as catalysts for many biochemical reactions involved in cellular metabolism. The role of enzymes is to reduce the activation energies of biochemical reactions by forming complexes with its substrates. The lowering of activation energies favor an increase in the rates of biochemical reactions.
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Enzyme Kinetics01:19

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Enzymes speed up reactions by lowering the activation energy of the reactants. The speed at which the enzyme turns reactants into products is called the rate of reaction. Several factors impact the rate of reaction, including the number of available reactants. Enzyme kinetics is the study of how an enzyme changes the rate of a reaction.
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Introduction to Mechanisms of Enzyme Catalysis01:13

Introduction to Mechanisms of Enzyme Catalysis

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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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Related Experiment Video

Updated: Sep 24, 2025

Assaying Protein Kinase Activity with Radiolabeled ATP
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Methods for discovering catalytic activities for pseudokinases.

Miles H Black1, Marcin Gradowski2, Krzysztof Pawłowski3

  • 1Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX, United States.

Methods in Enzymology
|May 7, 2022
PubMed
Summary
This summary is machine-generated.

Pseudoenzymes, enzyme-like proteins lacking key residues, may perform different reactions. Researchers found novel protein kinase-like families with alternative transferase activities, suggesting a broader catalytic role for these proteins.

Keywords:
Atypical kinasesBioinformaticsPseudokinasesUncharacterized proteins

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Area of Science:

  • Biochemistry
  • Enzymology
  • Structural Biology

Background:

  • Pseudoenzymes possess structural similarity to active enzymes but lack essential catalytic residues.
  • Their apparent inactivity in standard assays may stem from testing the incorrect enzymatic reaction.
  • The protein kinase superfamily offers a scaffold for diverse enzymatic functions.

Purpose of the Study:

  • To investigate the catalytic potential of pseudoenzymes and atypical protein kinases.
  • To explore how variations in adenosine triphosphate (ATP) binding and active site residues generate novel reactions.
  • To propose methods for identifying and characterizing the activities of divergent enzyme superfamily members.

Main Methods:

  • Bioinformatic analysis to identify divergent or atypical enzyme superfamily members.
  • Experimental characterization of catalytic activity in newly discovered protein kinase-like families.
  • Structural analysis of adenosine triphosphate (ATP) binding orientations and active site residue dynamics.

Main Results:

  • Discovery of novel protein kinase-like families with distinct catalytic functions.
  • Demonstration that altered ATP binding and active site configurations can lead to alternative transferase activities.
  • Evidence for the catalytic versatility of the protein kinase fold beyond canonical kinase reactions.

Conclusions:

  • Pseudoenzymes and atypical kinases may possess uncharacterized transferase activities.
  • The protein kinase fold is more catalytically versatile than previously recognized.
  • A combined bioinformatic and experimental approach is effective for uncovering novel enzymatic functions.