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Related Concept Videos

Induced-fit Model01:13

Induced-fit Model

Most chemical reactions in cells require enzymes—biological catalysts that speed up the reaction without being consumed or permanently changed. They reduce the activation energy needed to convert the reactants into products. Enzymes are proteins, that usually work by binding to a substrate—a reactant molecule that they act upon.
Enzymes exhibit substrate specificity, meaning that they can only bind to certain substrates. This is mainly determined by the shape and chemical characteristics of...
Enzymes02:34

Enzymes

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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Introduction to Mechanisms of Enzyme Catalysis

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 a mild...

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Immobilized enzymes as catalytically-active tools for nanofabrication.

Chang-Hyun Jang1, Benjamin D Stevens, Paul R Carlier

  • 1Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061-0212, USA.

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|October 10, 2002
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Summary

Researchers demonstrated surface trapping of enzyme-generated products for nanostructure creation. This key step utilizes catalytic surface molecules to amplify and direct chemical reactions on surfaces.

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Area of Science:

  • Surface chemistry
  • Nanotechnology
  • Biocatalysis

Background:

  • Surface modification is crucial for creating nanostructures.
  • Catalysis offers amplification and chemical specificity for surface reactions.
  • Enzyme immobilization on surfaces enables localized chemical transformations.

Purpose of the Study:

  • To demonstrate the surface trapping of a product generated by a nanometer-scale patch of surface-bound enzyme.
  • To showcase a key step in utilizing catalytic surface molecules for nanostructure fabrication.
  • To validate the concept of localized enzymatic reactions for surface modification.

Main Methods:

  • Nanografting was employed to create a 70-nm patch of carboxylic acid groups on a gold surface, surrounded by antibiofouling oligo(ethylene oxide) groups.
  • Acetylcholine esterase was immobilized onto the carboxylic acid patch to serve as a catalytic site.
  • A product trap was created by scratching a hole in the antibiofouling layer, exposing the gold surface.

Main Results:

  • The immobilized enzyme catalyzed the reaction of acetylthiocholine.
  • The reaction product was successfully trapped in the prepared hole within the surface film.
  • The experiment confirmed the localized enzymatic reaction and subsequent surface modification.

Conclusions:

  • Surface-bound enzymes can generate products that are spatially confined.
  • This method enables the creation of nanostructures through controlled surface modification.
  • The demonstrated strategy is a viable approach for fabricating functional nanostructured surfaces.