Surface-induced dissociation of multiply-protonated proteins

Analytical Chemistry
R A ChorushF W McLafferty

Abstract

A novel surface design compatible with the open cell geometry allows nonglancing angle collisions of selected ions stored in a Fourier transform mass spectrometer. Dissociation efficiencies of 36%, 22%, and 14% are achieved for gramicidin S, melittin, and carbonic anhydrase (29 kDa), respectively. Ion neutralization by the surface, which is highly competitive for many singly-charged ions, is minimal, and dissociation products of hypervalent neutral species are not detected. Instead, the spectra are similar to those from collisionally activated and infrared multiphoton dissociation; the fragmentation pathways are relatively independent of the method of energy deposition. For carbonic anhydrase, however, the single event excitation inherent to surface-induced dissociation appears to minimize secondary fragmentation, a critical advantage for tandem mass spectrometry of such large ions. Electrically floating the open cell below ground greatly enhances the collection efficiency.

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