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- W2070247089 abstract "Mass spectral analysis of tryptic digests of cross-linked proteins offers considerable promise as a simple technique to probe protein structure and study protein-protein interactions. We describe the use of a 1:1 mixture of isotopically labeled and unlabeled cross-linkers, disuccinimidyladipate (DSA) and dimethyladipimidate (DMA), to enhance visualization of cross-linked peptides in a tryptic digest. Optimized intramolecular reactions of cytochrome c and ribonuclease A (RNase A) with DSA yielded an average of two cross-links per protein molecule. After digestion of the cross-linked cytochrome c with trypsin and analysis by liquid chromatography/mass spectrometry (LC/MS) and matrix-assisted laser desorption/ionization (MALDI), eight modified peptides, five cross-linked and two end-capped, were detected by virtue of their doublet character. An eighth modified peptide's identity remained ambiguous because of its inability to fragment. The lysine-lysine distance constraints obtained are discussed in the context of the known NMR and X-ray structures of cytochrome c. Analysis of cross-linked RNase A by LC/MS and MALDI yielded nine modified peptides, four of which were modified twice, as indicated by the isotopic triplets. Although seven of these peptides contained cross-links, few distance constraints were gained due to the fact that the cross-linked products were variations of modification of the same three lysine residues." @default.
- W2070247089 created "2016-06-24" @default.
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- W2070247089 date "2001-12-21" @default.
- W2070247089 modified "2023-10-09" @default.
- W2070247089 title "Intramolecular cross-linking experiments on cytochrome c and ribonuclease A using an isotope multiplet method" @default.
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- W2070247089 doi "https://doi.org/10.1002/rcm.554" @default.
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