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(E)-1-alkyl-4-

Holler1, Sin, James

  • 1Laboratoire de Chimie Organique Biologique, UMR 7509, Faculte de Chimie, Universite Louis Pasteur, Strasbourg, France.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|July 14, 2000
PubMed
Summary

New pyridinium salts are effective reagents for thiol modification. These compounds exhibit high selectivity for thiol groups, enabling precise quantitative determination in proteins.

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Faraday discussions·2014

Area of Science:

  • Organic Chemistry
  • Biochemistry
  • Chemical Biology

Background:

  • Development of selective reagents for thiol modification is crucial in biochemistry.
  • Pyridinium salts offer a versatile scaffold for designing reactive chemical probes.
  • Understanding nucleophilic vinylic substitution (S(N)V) is key to designing targeted reagents.

Purpose of the Study:

  • To synthesize and characterize novel (E)-1-alkyl-4-[2-(alkylsulfonyl)-1-ethenyl]pyridinium salts.
  • To investigate the reactivity and selectivity of these pyridinium salts towards thiols.
  • To evaluate the utility of these compounds for quantitative thiol determination in proteins.

Main Methods:

  • Two-step synthesis of pyridinium sulfone derivatives.
  • Nucleophilic vinylic substitution (S(N)V) reactions with various mercaptans.
  • X-ray diffraction analysis to determine structural features.
  • Kinetic studies (first-order and second-order reactions) in deuterated DMSO and TES buffer.
  • Enzyme modification assays and spectrophotometric analysis (UV-Vis).

Main Results:

  • Successful synthesis of stable (E)-1-alkyl-4-[2-(alkylsulfonyl)-1-ethenyl]pyridinium salts.
  • Demonstrated S(N)V reactivity with mercaptans, forming 4-(thiovinyl)-pyridinium salts.
  • X-ray structure confirmed sulfur conjugation with the pyridinium ring.
  • Isomerization of Z to E isomer observed with a specific activation energy.
  • High selectivity for thiols at pH 7, with a specific reaction rate with glutathione.
  • Substitution product exhibits intense long-wavelength absorption (λmax=360 nm, ε=27,500 M⁻¹cm⁻¹).
  • Successful modification of enzymes, indicating selectivity for free thiol groups.

Conclusions:

  • The synthesized pyridinium sulfones are stable and reactive towards thiols via S(N)V.
  • The reagent demonstrates high selectivity for thiol groups, even in complex biological systems.
  • These compounds are valuable tools for the quantitative determination of free thiol groups in proteins.

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