Acid phosphatase activity in ungerminated conidia from Colletotrichum graminicola as determined by spectrophotometric and cytochemical methods
Braz. j. morphol. sci
;
17(2): 81-85, jul.-dez. 2000. ilus
Article
Dans Anglais
| LILACS
| ID: lil-313962
RESUMO
The acid phosphatase in ungerminated conidia from Colletotrichum graminicola, a corn pathogen, was investigated using spectrophotometric and cytochemical methods. Acid phosphatase activity was studied in a homogenate obtained by fragmentation of ungerminated conidia. With p-nitrophenylphosphate as substrate, the apparent Vmax and Km were 1.000 nmol p-nitrophenol/mg of protein/min and 0.631 mM, respectively. The pH and temperature optima were 5.5 and 60 graus Celsius, respectively. A cytochemical ultrastructural assay showed deposition of the reaction product inside vacuoles but not extracellularly on the cell surface. The permeabilization of conidia with Triton X-100 increased acid phosphatase activity eight fold. Compared to other procedures, our method was fast, easy to perform and gave consistent results.
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Acid phosphatase
/
Vacuoles
langue:
Anglais
Texte intégral:
Braz. j. morphol. sci
Thème du journal:
Anatomie
Année:
2000
Type:
Article
Pays d'affiliation:
Brésil
Institution/Pays d'affiliation:
Federal University of Paraná/BR
Documents relatifs à ce sujet
MEDLINE
...
LILACS
LIS