title: Secretion of sucrase by Leishmania donovani.
abstract: Leishmania donovani promastigotes were collected, washed, resuspended in buffer, and assayed for sucrase activity. No activity was observed in the intact washed cells, but activity was measurable when the cells were permeabilized with Triton X-100. Intracellular sucrase activity was highest in promastigotes grown at pH 7.4, somewhat lower in promastigotes grown at pH 5.5, and significantly lower in "amastigotes" grown at pH 5.5. No trehalase, lactase, or maltase activities were observed. Assay of the medium in which the cells had grown showed that most the sucrase activity was extracellular, i.e. was secreted into the medium during growth.
authors.affiliation: Department of Cell Biology, Duke University Medical Center, Durham, North Carolina 27710.
authors.forename: J J
authors.initials: JJ
authors.lastname: Blum
authors.forename: F R
authors.initials: FR
authors.lastname: Opperdoes
mesh_terms: D000818:Animals; D003470:Culture Media; D006863:Hydrogen-Ion Concentration; D007893:Leishmania donovani / Q000201:enzymology*; D017830:Octoxynol; D013393:Sucrase / Q000378:metabolism*
chemical_list: D003470:Culture Media; D017830:Octoxynol; D013393:Sucrase