Oxygen- and carbon monoxide-binding kinetic parameters for liposomal heme under semi-physiological condition

Eishun Tsuchida, Hiroyuki Nishide, Mikiya Sekine, Makoto Yuasa, Tetsutaro Iizuka, Yuzuru Ishimura

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Binding and dissociation rate constants of oxygen and carbon monoxide with the meso-tetra(α,α,α,α-(o-pivalamidophenyl))porphinato iron-mono(1-lauryl-2-methylimidazole) complex incorporated into the liposomes of dimyristoylphosphatidylcholine (liposomal heme) were measured with flash-photolysis method at pH 7.0 and 20 °C. Extra large quantum yield was observed for the photo-dissociation of the oxygen adduct, while that for the CO adduct was relatively small. Rate constants for the binding and the dissociation were comparable to those of hemoglobin except for the oxygen-binding rate constant.

Original languageEnglish
Pages (from-to)858-863
Number of pages6
JournalBiochemical and Biophysical Research Communications
Volume109
Issue number3
DOIs
Publication statusPublished - 1982 Dec 15

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

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