Studies on Thermal Denaturation of Fish Apomyoglobins using Differential Scanning Calorimetry, Circular Dichroism, and Fluorescence

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  • Chanthai Saksit
    Department of Chemistry, Faculty of Science and Technology, Sophia University
  • Ogawa Masahiro
    Department of Chemistry, Faculty of Science and Technology, Sophia University
  • Tamiya Toru
    Department of Chemistry, Faculty of Science and Technology, Sophia University
  • Tsuchiya Takahide
    Department of Chemistry, Faculty of Science and Technology, Sophia University

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  • Studies on Thermal Denaturation of Fish

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Apomyoglobins from both fish (yellowfin tuna, bonito, and yellowtail) and mammals (sheep and sperm whale) exhibited a single endothermic peak, reflecting a two-state processof thermal unfolding. A native structure of fish apomyoglobins had smaller α-helix content and showedless thermal stability of the α-helix structure than that of the mammalian ones. The conformational stability of a tertiary fold of the fish apoproteins observed from a tryptophan fluorescence intensity and the fluorescence intensity of ANS-apomyoglobin complex was also found to be lower than that of the mammalian apoproteins. These results suggest that even though the thermal unfolding process is predominantly similar, the fish apoproteins particularly show structural conformity with less compact and less stable globin than that of the mammalian apoproteins. The results were also compared with those of their holomyoglobins.

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