A novel copper(II) coordination at His186 in full-length murine prion protein
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Abstract
To explore Cu(II) ion coordination by His186 in the C-terminal domain of full-length prion protein (moPrP), we utilized the magnetic dipolar interaction between a paramagnetic metal, Cu(II) ion, and a spin probe introduced in the neighborhood of the postulated binding site by the spin labeling technique (SDSL technique). Six moPrP mutants, moPrP(D143C), moPrP(Y148C), moPrP(E151C), moPrP(Y156C), moPrP(T189C), and moPrP(Y156C,H186A), were reacted with a methane thiosulfonate spin probe and a nitroxide residue (R1) was created in the binding site of each one. Line broadening of the ESR spectra was induced in the presence of Cu(II) ions in moPrP(Y148R1), moPrP(Y151R1), moPrP(Y156R1), and moPrP( T189R1) but not moPrP(D143R1). This line broadening indicated the presence of electron–electron dipolar interaction between Cu(II) and the nitroxide spin probe, suggesting that each interspin distance was within 20 Å. The interspin distance ranges between Cu(II) and the spin probes of moPrP(Y148R1), moPrP(Y151R1), moPrP(Y156R1), and moPrP(T189R1) were estimated to be 12.1 Å, 18.1 Å, 10.7 Å, and 8.4 Å, respectively. In moPrP(Y156R1,H186A), line broadening between Cu(II) and the spin probe was not observed. These results suggest that a novel Cu(II) binding site is involved in His186 in the Helix2 region of the C-terminal domain of moPrPC.
Journal
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- Biochemical and Biophysical Research Communications
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Biochemical and Biophysical Research Communications 394 (3), 522-528, 2010-04-09
Elsevier
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Keywords
Details 詳細情報について
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- CRID
- 1050282677654429696
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- NII Article ID
- 120002148672
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- NII Book ID
- AA00564395
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- ISSN
- 10902104
- 0006291X
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- HANDLE
- 2115/43092
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- Text Lang
- en
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- Article Type
- journal article
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- Data Source
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- IRDB
- CiNii Articles