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Structural Characterization of Actinomycin D Using Multiple Ion Isolation and Electron Induced Dissociation

  • Research Article
  • Published:
Journal of The American Society for Mass Spectrometry

Abstract

Non-ribosomal peptides are bio synthesized using a range of enzymes that allow much more structural variability compared with “normal” peptides. Deviations from the standard amino acid structures are common features of this diverse class of natural products, making sequencing a challenging process. FTICR mass spectrometry, specifically the complementary tandem mass spectrometry techniques collision activated dissociation (CAD) and electron induced dissociation (EID), have been used to reveal structural information on the non-ribosomal peptide actinomycin D. EID was also combined with a multiple ion isolation method in order to provide an accurate (sub-ppm) internal calibration for the product ions. EID has been found to produce more detailed, complementary data than CAD for actinomycin D, with additional information being provided through fragmentation of the sodium and lithium adducts. Furthermore, the use of isolation in the FTICR cell was found to increase product ion intensities relative to the precursor ion, enabling significantly more peaks to be detected than when using EID alone. The combination of multiple ion isolation with EID, therefore, enables an accurate internal calibration of the fragment ions to be made (average mass uncertainty of <0.3 ppm), as well as increasing the degree of fragmentation of the compound, resulting in detailed structural information.

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Acknowledgements

This work was supported by DTA (EPSRC) for R.W. Financial support from the NIH (grant NIH/NIGMS-R01GM078293), and the Warwick Centre for Analytical Science (EPSRC funded grant EP/F034210/1) is greatly appreciated. Also thanks go to Dr. Mark Barrow, Andrea Lopez-Clavijo, Pilar Perez-Hurtado, and Yulin Qi for help with instrumentation and discussion.

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  1. Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK

    Rebecca H. Wills & Peter B. O’Connor

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  1. Rebecca H. Wills
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  2. Peter B. O’Connor
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Correspondence to Peter B. O’Connor.

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Wills, R.H., O’Connor, P.B. Structural Characterization of Actinomycin D Using Multiple Ion Isolation and Electron Induced Dissociation. J. Am. Soc. Mass Spectrom. 25, 186–195 (2014). https://doi.org/10.1007/s13361-013-0774-y

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  • DOI: https://doi.org/10.1007/s13361-013-0774-y

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