Effect of peripheral trifluoromethyl groups in artificial iron porphycene cofactor on ligand binding properties of myoglobin

Takashi Matsuo, Kazuyuki Ito, Yuji Nakashima, Yoshio Hisaeda, Takashi Hayashi

    Research output: Contribution to journalArticlepeer-review

    19 Citations (Scopus)

    Abstract

    An iron porphycene, a structural isomer of iron porphyrin, with trifluromethyl groups at the peripheral position of the framework was incorporated into sperm whale apomyoglobin. The prepared myoglobin shows the higher O2 affinity than the native protein. However, the oxygen affinity of the reconstituted myoglobin is lower than that of the myoglobin having an iron porphycene without trifluromethyl groups, which is mainly originated from the enhancement of the O2 dissociation. The CO affinity of the myoglobin with the trifluoromethylated iron porphycene is similar to that observed for the reference protein having the iron porphycene without trifluoromethyl groups, although their C-O stretching frequencies are significantly different. The relationship between the electronic states of the porphycene ring and the ligand bindings is discussed.

    Original languageEnglish
    Pages (from-to)166-173
    Number of pages8
    JournalJournal of inorganic biochemistry
    Volume102
    Issue number2
    DOIs
    Publication statusPublished - Feb 2008

    All Science Journal Classification (ASJC) codes

    • Biochemistry
    • Inorganic Chemistry

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