Background: The fungal genus Aspergillus contains a number of species
that are capable of causing a spectrum of diseases in immunocompromised
humans. A. fumigatus accounts for approximately 90% of life-threatening infections.
Poly –acid ligand i.e. EDTA having potent antifungal activity against A. fumigatus
was investigated for its effect on fungal proteins.
Objective: The foremost objective of this research to reveal A.fumigatus proteins
inhibited in response to polyacid ligand i.e. EDTA.
Methods: The proteins profile has been analysed by silver stained gel electrophoresis.
The inhibited proteins then subjected to mass spectrophotometer. Further to
quantify the results, morphological effect of EDTA (MIC50-19.0 µg/ml) on fungus is studied by
Scanning Electron Microscopy (SEM). The toxicity of EDTA was determined by MTT assay.
Results: The research identified expression of two protein(s) i.e. 74/86kDa is inhibited. The peptide
mass fingerprinting identified these protein(s) bands as Phenyl alanyl t-RNA synhetase alpha subunit
PodG and di-peptidyl peptidase. The Scanning electron microscopy showed EDTA inhibited the hyphal
growth and also induced striking changes in hyphal morphology (like wrinkled, flattened hyphae
with disrupted tips). These cytological effects on hyphal growth and two targeted proteins of A.
fumigatus might be responsible for anti- Aspergillus activity of EDTA. Moreover EDTA was found
to be non toxic up to 250 µg/ml by MTT assay.
Conclusion: Phenyl alanyl t-RNA synhetase alpha subunit PodG and di-peptidyl peptidase might be
further studied to use them as target molecules in future or in translational medicine. It can be proceeded
for establishing an animal model to test its efficacy (in progress).