title: Proteoform-Specific Insights into Cellular Proteome Regulation.
abstract: Knowledge regarding compositions of proteomes at the proteoform level enhances insights into cellular phenotypes. A strategy is described herein for discovery of proteoform-specific information about cellular proteomes. This strategy involved analysis of data obtained by bottom-up mass spectrometry of multiple protein OGE separations on a fraction by fraction basis. The strategy was exemplified using five matched sets of lysates of uninfected and human respiratory syncytial virus-infected A549 cells. Template matching demonstrated that 67.3% of 10475 protein profiles identified focused to narrow pI windows indicative of efficacious focusing. Furthermore, correlation between experimental and theoretical pI gradients indicated reproducible focusing. Based on these observations a proteoform profiling strategy was developed to identify proteoforms, detect proteoform diversity and discover potential proteoform regulation. One component of this strategy involved examination of the focusing profiles for protein groups. A novel concordance analysis facilitated differentiation between proteoforms, including proteoforms generated by alternate splicing and proteolysis. Evaluation of focusing profiles and concordance analysis were applicable to cells from a single and/or multiple biological states. Statistical analyses identified proteoform variation between biological states. Regulation relevant to cellular responses to human respiratory syncytial virus was revealed. Western blotting and Protomap analyses validated the proteoform regulation. Discovery of STAT1, WARS, MX1, and HSPB1 proteoform regulation by human respiratory syncytial virus highlighted the impact of the profiling strategy. Novel truncated proteoforms of MX1 were identified in infected cells and phosphorylation driven regulation of HSPB1 proteoforms was correlated with infection. The proteoform profiling strategy is generally applicable to investigating interactions between viruses and host cells and the analysis of other biological systems.
authors.affiliation: From the ‡Protein Discovery Centre and.
authors.forename: Emma L
authors.initials: EL
authors.lastname: Norris
authors.affiliation: From the ‡Protein Discovery Centre and.
authors.forename: Madeleine J
authors.initials: MJ
authors.lastname: Headlam
authors.affiliation: From the ‡Protein Discovery Centre and.
authors.forename: Keyur A
authors.initials: KA
authors.lastname: Dave
authors.affiliation: §Statistics Unit, QIMR Berghofer Medical Research Institute, Herston, Queensland, Australia.
authors.forename: David D
authors.initials: DD
authors.lastname: Smith
authors.affiliation: ¶Respiratory Virus Section, Laboratory of Infectious Diseases, National Institute for Allergy and Infectious Diseases, NIH, Bethesda, Maryland, and.
authors.forename: Alexander
authors.initials: A
authors.lastname: Bukreyev
authors.affiliation: From the ‡Protein Discovery Centre and.
authors.forename: Toshna
authors.initials: T
authors.lastname: Singh
authors.affiliation: From the ‡Protein Discovery Centre and.
authors.forename: Buddhika A
authors.initials: BA
authors.lastname: Jayakody
authors.affiliation: ‖School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland, Australia.
authors.forename: Keith J
authors.initials: KJ
authors.lastname: Chappell
authors.affiliation: ¶Respiratory Virus Section, Laboratory of Infectious Diseases, National Institute for Allergy and Infectious Diseases, NIH, Bethesda, Maryland, and.
authors.forename: Peter L
authors.initials: PL
authors.lastname: Collins
authors.affiliation: From the ‡Protein Discovery Centre and ‖School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland, Australia jeff.gorman@qimr.edu.au.
authors.forename: Jeffrey J
authors.initials: JJ
authors.lastname: Gorman
mesh_terms: D000072283:A549 Cells / Q000378:metabolism / Q000821:virology*; D002853:Chromatography, Liquid / Q000379:methods; D005786:Gene Expression Regulation; D006801:Humans; D010766:Phosphorylation; D059748:Proteolysis; D020543:Proteome / Q000378:metabolism*; D040901:Proteomics / Q000379:methods*; D018113:Respiratory Syncytial Virus, Human / Q000502:physiology*; D053719:Tandem Mass Spectrometry / Q000379:methods
chemical_list: D020543:Proteome