Free radical reactions of MTDQ and its effect on biological membrane

J. Belágyi, Béla Török, László Pótó

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The effect of 6,6′-methylene-bis-2,2,4-trimethyl-1,2-dihydroquinoline (MTDQ) and its water soluble species (MTDQ-DA) was studied in biological membrane and model systems using EPR spectroscopy for detecting molecular motion and radical formation. Both compounds influenced the rotational mobility of maleimide spin labels attached to proteins of the nerve membrane: the addition of MTDQ or MTDQ-DA induced an increase of the rigidity of the membrane in the environment of the attaching sites. The reaction of MTDQ-DA with hydroxyl and superoxide free radicals showed that this compound was also a competitive OH and superoxide free radical scavenger. The reaction rate constant of the formation of MTDQ-DA free radical was k = (4.0 ± 0.5) · 109 M-1 s-1 in the hydroxyl free radical generating system. Simulation of EPR spectra supported that MTDQ-DA free radical was very likely a stable nitroxide free radical.

Original languageEnglish
Pages (from-to)123-128
Number of pages6
JournalBBA - Biomembranes
Volume1190
Issue number1
DOIs
Publication statusPublished - Feb 23 1994

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Free radical reactions
Biological membranes
Free Radicals
Membranes
Superoxides
Hydroxyl Radical
Paramagnetic resonance
Spin Labels
Biological Models
Free Radical Scavengers
Rigidity
Reaction rates
Rate constants
Spectrum Analysis
Membrane Proteins
6,6'-methylenebis(2,2-dimethyl-4-methanesulfonic acid-1,2-dihydroquinoline)
6,6'-methylene bis(2,2,4-trimethyl-1,2-dihydroquinoline)
Spectroscopy
Water
Proteins

Keywords

  • Biological membrane
  • EPR
  • Free radical
  • MTDQ

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Cell Biology

Cite this

Free radical reactions of MTDQ and its effect on biological membrane. / Belágyi, J.; Török, Béla; Pótó, László.

In: BBA - Biomembranes, Vol. 1190, No. 1, 23.02.1994, p. 123-128.

Research output: Contribution to journalArticle

Belágyi, J. ; Török, Béla ; Pótó, László. / Free radical reactions of MTDQ and its effect on biological membrane. In: BBA - Biomembranes. 1994 ; Vol. 1190, No. 1. pp. 123-128.
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