| Susceptible Region of Myoglobins to In-source Decay Using Matrix-assisted Laser Desorption/Ionization Coupled with Delayed Extraction Reflectron Time-of-Flight Mass Spectrometer |
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* Graduate School of Integrated Science, Yokohama City University (22-2 Seto, Kanazawa-ku, Yokohama 236-0027, Japan) |
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| The susceptibility to in-source decay (ISD) in myoglobin, using matrix-assisted laser desorption/ionization (MALDI) coupled with a delayed extraction reflectron time-of-flight (TOF) mass spectrometer, has been described from the standpoint of secondary structures. The ISD data of three different myoglobins showed a common intense product of c35 ion originated from the cleavage of amine bond N-Cα at Gly35-His36 or Ser35-His36 residues. It is suggested that the relatively abundant formation of c35 ion in Gly35-His36 or Ser35-His36 residues is not due to the presence of His36 residue, but due to a turn region between helices in secondary structure of myoglobins. | ||
| Key words: MALDI, In-source decay, Myoglobin | ||
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