Thermal denaturation and autoxidation profiles of carangid fish myoglobins

Muhammad Mehedi Hasan, Purnama Arafah, Hideo Ozawa, Hideki Ushio, Yoshihiro Ochiai

Research output: Contribution to journalArticlepeer-review

Abstract

Although myoglobin (Mb) has been considered to be one of the well-characterized proteins, screening of post-genomic era databases revealed the lack of adequate information on teleost Mbs. The present study was aimed to investigate stability and functional features of Mbs from three teleosts of the same family. To unfold how primary structure influences the stability and function of proteins, Mbs were purified from the dark muscles of three carangids, namely, yellowtail, greater amberjack, and silver trevally. Thermostabilities measured by circular dichroism (CD) spectrometry revealed species-specific thermal denaturation pattern, i.e., silver trevally > yellowtail > greater amberjack Mbs. On the other hand, autoxidation rate constants of the ferrous forms of those three carangid Mbs showed positive correlation between the ferrous state of the heme iron and rising temperature. The order of autoxidation rate was in the order of greater amberjack > yellowtail > silver trevally Mbs. The finding of the present study denotes that the thermal stability is not necessarily correlated with the functional stability of carangid Mbs even though their primary structures shared high homology (84–94%).

Original languageEnglish
Pages (from-to)487-498
Number of pages12
JournalFish Physiology and Biochemistry
Volume47
Issue number2
DOIs
Publication statusPublished - 2021 Apr

Keywords

  • Autoxidation
  • Carangid fish
  • Myoglobin
  • Thermostability

ASJC Scopus subject areas

  • Biochemistry
  • Physiology
  • Aquatic Science

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