Flett FJ, Walton JGA, Mackay CL, Interthal H. Click chemistry generated model DNA-peptide heteroconjugates as tools for mass spectrometry.
Anal Chem 2016;
87:9595-9. [PMID:
26335278 DOI:
10.1021/acs.analchem.5b02047]
[Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
UV cross-linking of nucleic acids to proteins in combination with mass spectrometry is a powerful technique to identify proteins, peptides, and the amino acids involved in intermolecular interactions within nucleic acid-protein complexes. However, the mass spectrometric identification of cross-linked nucleic acid-protein heteroconjugates in complex mixtures and MS/MS characterization of the specific sites of cross-linking is extremely challenging. As a tool for the optimization of sample preparation, ionization, fragmentation, and detection by mass spectrometry, novel synthetic DNA-peptide heteroconjugates were generated to act as mimics of UV cross-linked heteroconjugates. Click chemistry was employed to cross-link peptides to DNA oligonucleotides. These heteroconjugates were fully characterized by high resolution FTICR mass spectrometry and by collision-induced dissociation (CID) following nuclease P1 digestion of the DNA moiety to a single nucleotide monophosphate. This allowed the exact site of the cross-linking within the peptide to be unambiguously assigned. These synthetic DNA-peptide heteroconjugates have the potential to be of use for a variety of applications that involve DNA-peptide heteroconjugates.
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