Abstract
The catalytic effect of metmyoglobin on the back thermal cis → trans isomerization reaction of stilbazolium betaine M is reported. This reaction shows substantial acceleration in the presence of metmyoglobin in comparison to the same reaction without the protein or in the presence of metmyoglobin cyanide. It is suggested that the observed thermal reaction acceleration may arise from the coordination of the protonated stilbazolium betaine molecule to the sixth ligand position of the heme iron and subsequent chromophore deprotonation or from the low polarity of the heme pocket microenvironment.
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Vogel, V.R., Pastukhov, A.V. & Kotelnikov, A.I. Catalysis of the Back Thermal cis–trans Isomerization Reaction of Stilbazolium Betaine by Metmyoglobin. Journal of Fluorescence 9, 209–211 (1999). https://doi.org/10.1023/A:1022555616979
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DOI: https://doi.org/10.1023/A:1022555616979