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Balancing Redox Equations02:58

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Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Redox titration is a chemical analysis technique used to determine the concentration of an unknown substance by measuring the electron transfer in a redox (reduction-oxidation) reaction. The process involves gradually adding a titrant with a known concentration of an oxidizing or reducing agent, to the analyte, the solution with an unknown concentration, until reaching the endpoint, which indicates the completion of the reaction between the two substances. Ensuring the analyte is in a single...
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Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
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Redox-Controlled Site-Specific α2-6-Sialylation.

Na Lu1, Jinfeng Ye1, Jiansong Cheng2

  • 1National Glycoengineering Research Center, State Key Laboratory of Microbial Technology , Shandong University , Qingdao 266237 , China.

Journal of the American Chemical Society
|March 8, 2019
PubMed
Summary

A new redox-controlled method enables precise site-specific sialylation using Photobacterium damselae α2-6-sialyltransferase (Pd2,6ST). This strategy masks unwanted sites, allowing targeted synthesis of complex α2-6-linked sialosides.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Glycochemistry

Background:

  • Bacterial α2-6-sialyltransferase from Photobacterium damselae (Pd2,6ST) is crucial for synthesizing α2-6-linked sialosides.
  • Pd2,6ST's broad substrate specificity poses challenges for site-specific sialylation of complex molecules with multiple galactose or N-acetylgalactosamine units.

Purpose of the Study:

  • To develop a general strategy for site-specific α2-6-sialylation using Pd2,6ST.
  • To overcome the limitations of Pd2,6ST's substrate flexibility in complex glycan synthesis.

Main Methods:

  • Enzymatic oxidation of specific galactose units to mask them from sialylation.
  • Utilizing redox control to direct Pd2,6ST activity to desired sites.
  • Site-specific α2-6-sialylation of intact galactose or N-acetylgalactosamine residues.

Main Results:

  • A novel redox-controlled strategy for site-specific sialylation was established.
  • Unwanted sialylation sites were effectively masked through enzymatic oxidation.
  • Precise control over α2-6-sialylation at target galactose and N-acetylgalactosamine units was achieved.

Conclusions:

  • The developed redox-controlled method enables precise site-specific α2-6-sialylation with Pd2,6ST.
  • This strategy significantly enhances the ability to synthesize complex α2-6-linked sialosides.
  • The approach offers a versatile tool for targeted glycan engineering and synthesis.