Characterization of an Ion Mobility-Multiplexed Collision Induced Dissociation- Tandem Time-of-Flight Mass Spectrometry Approach
The confidence in peptide (and protein) identifications with ion mobility spectrometry time-of-flight mass spectrometry (IMS-TOFMS) is expected to drastically improve with the addition of information from an efficient ion dissociation step prior to MS detection. High throughput IMS-TOFMS analysis imposes a strong need for multiplexed ion dissociation approaches where multiple precursor ions yield complex sets of fragment ions that are often intermingled with each other in both the drift time and m/z domains. We have developed and evaluated a novel approach for collision-induced dissociation (CID) with an IMS-TOFMS instrument. It has been shown that precursor ions activated inside an rf-device with an axial dc-electric field produce abundant fragment ions which are radially confined with the rf-field and collisionally cooled at an elevated pressure, resulting in high CID efficiencies comparable or higher than those measured in triple-quadrupole instruments We have also developed an algorithm for deconvoluting these complex multiplexed tandem MS spectra by clustering both the precursor and fragment ions into the matching drift time profiles and by effectively utilizing high mass measurement accuracy of the TOFMS. In a single IMS separation with a tryptic digest of bovine serum albumin (BSA), we have reliably identified 20 unique peptides using multiplexed CID approach downstream of the IMS separation. Peptides were identified based upon the correlation between the precursor and fragment drift time profiles and by matching the profile representative masses to those of in silico BSA tryptic peptides and their fragments. The false discovery rate (FDR) of peptide identifications from multiplexed MS/MS spectra was less than 1%.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 982555
- Report Number(s):
- PNNL-SA-68112; 24698; 34708; 32707; 400412000; TRN: US201014%%379
- Journal Information:
- International Journal of Mass Spectrometry, 293(1-3):34-44, Vol. 293, Issue 1-3; ISSN 1387-3806
- Country of Publication:
- United States
- Language:
- English
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