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Nature Methods 5, 459–460 (1 June 2008) | doi:10.1038/nmeth0608-459

Iodoacetamide-induced artifact mimics ubiquitination in mass spectrometry

Michael L Nielsen , Michiel Vermeulen , Tiziana Bonaldi , J|[uuml]|rgen Cox , Luis Moroder & Matthias Mann

To the editor: Mass spectrometry has become the standard tool to map sites of ubiquitination, which is a covalent protein modification with a central role in regulating cellular processes. Ubiquitin is a small and highly conserved protein that is enzymatically attached to specific lysines of substrate proteins via its C terminus.