Bulletin of the Society of Sea Water Science, Japan
Online ISSN : 2185-9213
Print ISSN : 0369-4550
ISSN-L : 0369-4550
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Volume 73, Issue 3
Displaying 1-9 of 9 articles from this issue
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Preface
Preprint of The 70th Annual Meeting
Note
  • Metal Binding Properties of His-Asp Repeat Peptide from Halophilic His-rich Metal Binding Protein Monitored by Circular Dichroism Measurement
    Tsutomu ARAKAWA, Hiroko TOKUNAGA, Matsujiro ISHIBASHI, Masao TOKUNAGA
    2019 Volume 73 Issue 3 Pages 159-164
    Published: 2019
    Released on J-STAGE: October 01, 2020
    DOIhttps://doi.org/10.11457/swsj.73.3_159
    JOURNAL FREE ACCESS
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    A His-Asp repeat peptide sequence was identified in a His-rich metal binding protein （HP） produced by a halophilic marine bacterium, Chromohalobacter salexigens DSM 3043T. A synthetic peptide, PepB20, containing 8 His-Asp repeats showed binding to an Ni-loaded metal-chelating column and elution around 150-200 mM imidazole in the presence of both low （0.15 M） and high （1.5 M） concentrations of NaCl. Addition of Ni or Zn ions at 0.1 to 1 mM resulted in changes in secondary structure of PepB20, leading to metal-induced insoluble aggregation at 1 mM. PepB20 showed different circular dichroism （CD） profiles induced by the binding of Ni or Zn ions, suggesting a formation of different secondary structures by these metal ions. We described metal binding properties and consequent structure changes of PepB20 examined by CD measurements and discuss the possible physiological importance of the His-rich metal binding insertion sequence found in HP.
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Relay Essay (37)
Introduction of Research Committees
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