Jump to main content
Jump to site search

Issue 4, 2018
Previous Article Next Article

Deducing disulfide patterns of cysteine-rich proteins using signature fragments produced by top-down mass spectrometry

Author affiliations

Abstract

Direct mapping of protein disulfide patterns using top-down mass spectrometry (MS) is often hampered by inadequate fragmentation at the disulfide-enclosing region, and insufficient structural information provided by the fragments. Here we used electron-transfer/high energy collision dissociation (EThcD) to improve the fragmentation efficiency, and developed strategies that minimize the false positive identification of fragments and deconvolute the signals representing specific modifications made to the disulfide-cleavage-induced fragments. We observed clear correlations between unique modification (attachment or removal of H or SH) patterns and the number of disulfide bonds that enclose the corresponding region. Using the characteristic signature fragments, we in part localized the Cys-bridging sites in disulfide-scrambled lysozymes, and reduced the number of putative disulfide patterns from 104 to 6. The results demonstrated the feasibility of direct analysis of complex disulfide patterns using top-down MS.

Graphical abstract: Deducing disulfide patterns of cysteine-rich proteins using signature fragments produced by top-down mass spectrometry

Back to tab navigation

Supplementary files

Publication details

The article was received on 01 Oct 2017, accepted on 02 Jan 2018 and first published on 04 Jan 2018


Article type: Communication
DOI: 10.1039/C7AN01625E
Citation: Analyst, 2018,143, 817-823
  •   Request permissions

    Deducing disulfide patterns of cysteine-rich proteins using signature fragments produced by top-down mass spectrometry

    X. Zhao, Y. Shen, W. Tong, G. Wang and D. D. Y. Chen, Analyst, 2018, 143, 817
    DOI: 10.1039/C7AN01625E

Search articles by author

Spotlight

Advertisements