Preparation and O2 binding study of myoglobin having a cobalt porphycene

Takashi Matsuo, Takashi Tsuruta, Keiko Maehara, Hideaki Sato, Yoshio Hisaeda, Takashi Hayashi

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36 Citations (Scopus)

Abstract

Sperm whale myoglobin, an oxygen-storage hemoprotein, was reconstituted with 2,7-diethyl-3,6,12,17-tetramethyl-13,16-bis(carboxyethyl) porphycenatocobalt(II) in order to investigate the reactivities of a cobalt porphycene in a protein matrix. Similar to the previously reported finding for the myoglobin with the iron porphycene, the reconstituted myoglobin with the cobalt porphycene was also found to have an O2 affinity 2 orders of magnitude greater than that of the myoglobin possessing cobalt protoporphyrin IX. The EPR spectra of the deoxy and oxy myoglobins having the cobalt porphycene at 77 K also have features similar to those of the myoglobin with cobalt protoporphyrin IX. These spectra suggest that the porphycene cobalt in the deoxy form is coordinated by one nitrogenous ligand postulated to be the imidazole ring of His93, and that the bond configuration of CoII-O2 is regarded as the CoIII-O2•- species.

Original languageEnglish
Pages (from-to)9391-9396
Number of pages6
JournalInorganic chemistry
Volume44
Issue number25
DOIs
Publication statusPublished - Dec 12 2005

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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    Matsuo, T., Tsuruta, T., Maehara, K., Sato, H., Hisaeda, Y., & Hayashi, T. (2005). Preparation and O2 binding study of myoglobin having a cobalt porphycene. Inorganic chemistry, 44(25), 9391-9396. https://doi.org/10.1021/ic0513639