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Related Concept Videos

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.
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Catalytically Perfect Enzymes01:07

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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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Electron Transport Chains01:28

Electron Transport Chains

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The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
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Reduction of Alkenes: Catalytic Hydrogenation02:13

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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
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Radical Chain-Growth Polymerization: Chain Branching01:17

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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

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Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
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Single-Chain Nanoparticles as Catalytic Nanoreactors.

Hannah Rothfuss1,2, Nicolai D Knöfel3, Peter W Roesky1,3

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Chemists create bioinspired catalysts by mimicking enzyme structures with synthetic polymers. These single-chain nanoparticles offer unique catalytic properties and enhance product formation through tailored active sites.

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Area of Science:

  • Bioinspired chemistry
  • Polymer science
  • Catalysis

Background:

  • Enzymes provide a blueprint for highly efficient and selective catalysts.
  • Synthetic macromolecular architectures offer tunable platforms for catalyst design.

Purpose of the Study:

  • To develop novel bioinspired catalysts by mimicking metallo-enzyme tertiary structures.
  • To create catalytically active single-chain nanoparticles using tailored polymeric frameworks.

Main Methods:

  • Designing synthetic polymer chains for targeted metal-ion placement.
  • Constructing single-chain nanoparticles with specific polymeric pockets.

Main Results:

  • Achieved catalytically active single-chain nanoparticles.
  • Observed unique catalyst characteristics and significant impact on product formation.
  • Demonstrated substrate recognition via the constructed polymeric pocket.

Conclusions:

  • Single-chain nanoparticles represent advanced bioinspired catalytic systems.
  • Tailored polymeric frameworks around active cores are key for enzyme-like substrate recognition and enhanced catalysis.