Abstract
Phosphatase activities were characterized in intact mycelial forms of Pseudallescheria boydii, which are able to hydrolyze the artificial substrate p-nitrophenylphosphate (p-NPP) to p-nitrophenol (p-NP) at a rate of 41.41 ± 2.33 nmol p-NP per h per mg dry weight, linearly with increasing time and with increasing cell density. MgCl2, MnCl2 and ZnCl2 were able to increase the (p-NPP) hydrolysis while CdCl2 and CuCl2 inhibited it. The (p-NPP) hydrolysis was enhanced by increasing pH values (2.5-8.5) over an approximately 5-fold range. High sensitivity to specific inhibitors of alkaline and acid phosphatases suggests the presence of both acid and alkaline phosphatase activities on P. boydii mycelia surface. Cytochemical localization of the acid and alkaline phosphatase showed electron-dense cerium phosphate deposits on the cell wall, as visualized by electron microscopy. The product of p-NPP hydrolysis, inorganic phosphate (Pi), and different inhibitors for phosphatase activities inhibited p-NPP hydrolysis in a dose-dependent manner, but only the inhibition promoted by sodium orthovanadate and ammonium molybdate is irreversible. Intact mycelial forms of P. boydii are also able to hydrolyze phosphoaminoacids with different specificity.
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Acknowledgments
We acknowledge Dr. Martha Sorenson (Instituto de Bioquímica Médica, Universidade Federal do Rio de Janeiro) for recommending needed changes in the English. This work was partially supported by grants from the Brazilian Agencies Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Coordenação de Aperfeiçoamento de Pessoal de Nível superior (CAPES) and Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ). Marcia R. Pinto is recipient of a fellowship from Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)—Grants Nos. 05/02776-0 and 05/56161-6.
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Kiffer-Moreira, T., Pinheiro, A.A.S., Pinto, M.R. et al. Mycelial forms of Pseudallescheria boydii present ectophosphatase activities. Arch Microbiol 188, 159–166 (2007). https://doi.org/10.1007/s00203-007-0232-y
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DOI: https://doi.org/10.1007/s00203-007-0232-y