Background: Proteomics facilitates understanding of the complexity of molecular and physiological mechanisms
involved in the metabolic and biological fungal adaptations to pH changes. Proteomics enables the identification of enzymes
and fungal proteins involved in these adaptations. This approach may be used to investigate such fungi as Aspergillus niveus, whose proteome has not yet been analyzed, changes the intra- and extracellular protein profiles in response to extracellular pH.
Objective: In the current study, we used two-dimensional gel electrophoresis (2DE) and mass spectrometry to evaluate the
response of A. niveus to grow at pH 5, 6, 7, and 8 for 96 hours submerged bioprocess culturing.
Methods: This study evaluated the response of A. niveus to grow at pH 5, 6, 7, and 8 for 96 h submerged bioprocess culturing, by analysis of two-dimensional gel electrophoresis (2DE), of the intracellular proteomes and the secretome, protein
spots of interest were submitted to tryptic digestion and analyzed by matrix-assisted laser desorption/ionization time-offlight tandem mass spectrometry (MALDI-TOF/TOF-MS).
Results: This approach revealed substantial differences between the functions of intra- and extracellular proteins of A. niveus. The data suggested that pH-modulated global proteins are involved in important, mainly metabolic, processes, in the
pentose phosphate pathway, protein regulation, cell wall maintenance, and others. Moreover, the change in extracellular pH
could have altered the availability of nutrients, and induced the production of enzymes that respond to oxidative and other
Conclusion: Proteomic facilitates understanding of the complexity of molecular and physiological mechanisms involved in
the metabolic and biological adaptations of fungi to pH changes.