title: Rapid prefractionation of complex protein lysates with centrifugal membrane adsorber units improves the resolving power of 2D-PAGE-based proteome analysis.
abstract: BACKGROUND
  Two-dimensional gel electrophoresis (2D-PAGE) has proven over the years to be a reliable and efficient method for separation of hundreds of proteins based on charge and mass. Nevertheless, the complexity of even the simplest proteomes limits the resolving power of 2D-PAGE. This limitation can be partially alleviated by sample prefractionation using a variety of techniques.
  
  
  RESULTS
  Here, we have used Vivapure Ion Exchange centrifugal adsorber units to rapidly prefractionate total fission yeast protein lysate based on protein charge. Three fractions were prepared by stepwise elution with increasing sodium chloride concentrations. Each of the fractions, as well as the total lysate, were analyzed by 2D-PAGE. This simple prefractionation procedure considerably increased the resolving power of 2D-PAGE. Whereas 308 spots could be detected by analysing total protein lysate, 910 spots were observed upon prefractionation. Thorough gel image analysis demonstrated that prefractionation visualizes an additional set of 458 unique fission yeast proteins not detected in whole cell lysate.
  
  
  CONCLUSIONS
  Prefractionation with Vivapure Q spin columns proved to be a simple, fast, reproducible, and cost-effective means of increasing the resolving power of 2D-PAGE using standard laboratory equipment.
authors.affiliation: Harvard NIEHS Center Proteomics Facility, Department of Genetics and Complex Diseases, Harvard School of Public Health, Boston, USA. mdoud@hsph.harvard.edu
authors.forename: Mary Kathryn
authors.initials: MK
authors.lastname: Doud
authors.forename: Michael W
authors.initials: MW
authors.lastname: Schmidt
authors.forename: David
authors.initials: D
authors.lastname: Hines
authors.forename: Claudia
authors.initials: C
authors.lastname: Naumann
authors.forename: Andreas
authors.initials: A
authors.lastname: Kocourek
authors.forename: Noushin
authors.initials: N
authors.lastname: Kashani-Poor
authors.forename: Robert
authors.initials: R
authors.lastname: Zeidler
authors.forename: Dieter A
authors.initials: DA
authors.lastname: Wolf
mesh_terms: D002498:Centrifugation / Q000295:instrumentation; D005591:Chemical Fractionation / Q000379:methods; D015180:Electrophoresis, Gel, Two-Dimensional / Q000295:instrumentation / Q000379:methods*; D005656:Fungal Proteins / Q000032:analysis* / Q000302:isolation & purification; D007091:Image Processing, Computer-Assisted / Q000379:methods; D020543:Proteome / Q000032:analysis* / Q000302:isolation & purification; D015203:Reproducibility of Results; D012568:Schizosaccharomyces / Q000737:chemistry
chemical_list: D005656:Fungal Proteins; D020543:Proteome