Comparison of lysis methods and preparation protocols for one- and two-dimensional electrophoresis of Aspergillus oryzae intracellular proteins.
Filamentous fungal fermentations are used to produce billions of dollars of biochemical and pharmaceutical products annually, yet are plagued by a number of poorly understood problems that would benefit from proteomic analysis. Unfortunately, few publications are available which describe extraction of filamentous fungal proteins for two-dimensional electrophoresis. The goal here was to develop protocols for extraction of fungal proteins, from both wild-type and a recombinant strain of the industrially important filamentous fungi Aspergillus oryzae, to be used for both one- and two-dimensional electrophoresis (1-DE and 2-DE). Because fungal cell walls are exceptionally resistant to fragmentation, four lysis protocols were tested: (i) boiling in strong alkali solution, (ii) boiling in Sodium dodecyl surfate (SDS), (iii) chemical lysis in Y-PER(R) reagent, and (iv) mechanical lysis via rapid agitation with glass beads in a Mini-BeadBeater(R). For both 1-DE and 2-DE, rapid agitation with glass beads was found to be the most efficient extraction method, yielding both mini- and large-format gels with little streaking or spot tailing, and proteins comprising a broad range of molecular weights and pI values.
Nandakumar
M P
MP
University of Maryland, Baltimore County (UMBC), Department of Chemical and Biochemical Engineering, Baltimore, MD 21250, USA.
Marten
Mark R
MR
D001236:Aspergillus oryzae / Q000737:chemistry*; D001426:Bacterial Proteins / Q000032:analysis / Q000302:isolation & purification*; D002458:Cell Fractionation / Q000379:methods; D015180:Electrophoresis, Gel, Two-Dimensional / Q000379:methods*; D004591:Electrophoresis, Polyacrylamide Gel / Q000379:methods; D040901:Proteomics / Q000379:methods* / Q000592:standards
D001426:Bacterial Proteins