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자료유형
학술저널
저자정보
Kyoung Min Kim (Kumoh National Institute of Technology) Ho-Tae Kim (Kumoh National Institute of Technology)
저널정보
한국질량분석학회 Mass Spectrometry Letters Mass Spectrometry Letters Vol.13 No.4
발행연도
2022.12
수록면
177 - 183 (7page)

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The monomer and dimer structures of the amyloid fragment Aβ(1–16) sequence formed in H<SUB>2</SUB>O were investigated using electrospray ionization mass spectrometry (MS) and tandem MS (MS/MS). Aβ16 monomers and dimers were indicated by signals representing multiple proton adduct forms, [monomer+zH]<SUP>n+</SUP> (=M<SUP>z+</SUP>, z = charge state) and [dimer+zH]<SUP>z+</SUP> (=D<SUP>z+</SUP>), in the MS spectrum. Fragment ions of monomers and dimers were observed using collision-induced dissociation MS/MS. Peptide bond dissociation was mostly observed in the D1–D7 and V11–K16 regions of the MS/MS spectra for the monomer (or dimer), regardless of the monomer (or dimer) charge state. Both covalent and non-covalent bond dissociation processes were indicated by the MS/MS results for the dimers. During the non-covalent bond dissociation process, the D<SUP>3+</SUP> dimer complex was separated into two components: the M<SUP>1+</SUP> and M<SUP>2+</SUP> subunits. During the covalent bond dissociation of the D<SUP>3+</SUP> dimer complex, the b and y fragment ions attached to the monomer, (M+b10-15)z+ and (M+y<SUB>9-15</SUB>)<SUP>z+</SUP>, were thought to originate from the dissociation of the M<SUP>2+</SUP> monomer component of the (M<SUP>1+</SUP>+M<SUP>2+</SUP>) complex. Two different D<SUP>3+</SUP> complex geometries exist; two distinguished interaction geometries resulting from interactions between the M<SUP>1+</SUP> monomer and two different regions of M<SUP>2+</SUP> (the N-terminus and C-terminus) are proposed. Intricate fragmentation patterns were observed in the MS/MS spectrum of the D<SUP>5+</SUP> complex. The complicated nature of the MS/MS spectrum is attributable to the coexistence of two D<SUP>5+</SUP> configurations, (M<SUP>1+</SUP>+M<SUP>4+</SUP>) and (M<SUP>2+</SUP>+M<SUP>3+</SUP>), in the Aβ16 solution.

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Abstract
Introduction
Experimental
Results and Discussion
Conclusion
References

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