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Related Concept Videos

Electron Transport Chains01:28

Electron Transport Chains

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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Oxidative phosphorylation is a highly efficient process that generates large amounts of adenosine triphosphate (ATP), the basic unit of energy that drives many cellular processes. Oxidative phosphorylation involves two processes— the electron transport chain and chemiosmosis.
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The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
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Amplifying Signals via Enzymatic Cascade01:22

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When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze the...
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Chain reactions involve highly reactive transient species, such as atoms or free radicals, as intermediates. These intermediates facilitate rapid reactions over an extended period. The process includes a series of steps: a reactive intermediate is consumed, reactants are converted to products, and the intermediate is regenerated. This cycle enables continuous repetition, amplifying the production of products with a small amount of intermediate. Chain reactions often utilize free radicals as...
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Deoxyribozyme-based ligase logic gates and their initial circuits.

Milan N Stojanovic1, Stanka Semova, Dmitry Kolpashchikov

  • 1Division of Clinical Pharmacology and Experimental Therapeutics, Department of Medicine, Columbia University, Box 84, 630 West 168th Street, New York, NY 10032, USA. mns18@columbia.edu

Journal of the American Chemical Society
|May 12, 2005
PubMed
Summary

Researchers built molecular logic gates using deoxyribozymes. These novel DNA-based logic gates were visualized through enzyme cascades, enabling complex molecular computations.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Synthetic Biology

Background:

  • Molecular logic gates are fundamental for computation.
  • Deoxyribozymes offer a platform for creating novel molecular tools.
  • Previous molecular logic systems have limitations in complexity and visualization.

Purpose of the Study:

  • To construct a complete set of molecular logic gates (YES, NOT, AND, ANDNOT) based on ligase deoxyribozymes.
  • To demonstrate the functionality of these deoxyribozyme logic gates.
  • To visualize the activity of these gates using enzyme cascades and fluorogenic cleavage.

Main Methods:

  • Construction of ligase deoxyribozyme-based molecular logic gates.
  • Design of enzyme cascades involving downstream phosphodiesterase YES gates.
  • Utilizing fluorogenic cleavage assays for activity visualization.

Main Results:

  • A complete set of molecular scale logic gates (YES, NOT, AND, ANDNOT) was successfully constructed.
  • The activity of these deoxyribozyme logic gates was demonstrated through functional cascades.
  • Fluorogenic cleavage by downstream phosphodiesterase YES gates provided clear visualization of gate operations.

Conclusions:

  • Ligase deoxyribozymes can be engineered into a full suite of molecular logic gates.
  • Enzyme cascades offer a robust method for visualizing and validating molecular computation.
  • This work advances the development of DNA-based molecular computing systems.