Ecto-ganglioside-sialidase activity of herpes simplex virus-transformed hamster embryo fibroblasts

Cara Lynne Schengrund, Abraham Rosenberg, Mary Ann Repman

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Cellular location of ganglioside-sialidase activity was determined in confluent hamster embryo fibroblasts transformed with herpes simplex virus type 2. Approximately equal specific activities of ganglioside-sialidase activity were found to be associated with the crude lysosomal and crude plasma membrane fractions isolated from whole cell homogenates. Whole transformed cells hydrolyzed exogenous ganglioside substrate, suggesting a partial location of the cellular sialidase on the outer surface of the plasma membrane of these cells. Intact cells were treated with the diazonium salt of sulfanilic acid, a nonpenetrating reagent inhibitory to ecto-enzymes (DePierre, J. W., and M. L. Kamovsky. 1974. J. Biol. Chem. 249: 7111-7120). Cytoplasmic lactate dehydrogenase activity was not inhibited by this treatment, and mitochondrial succinate dehydrogenase activity was inhibited only 10%, indicating that intracellular enzymes were not affected. 5′-Nucleotidase activity was diminished 90%, and sialidase very rapidly lost 40% of its exogenously directed activity. These results show that, in herpes simplex virus- transformed fibroblasts, ganglioside-sialidase is both a lysosomal and a plasma membrane enzyme. The plasma membrane sialidase is capable of acting on endogenous plasma membrane sialolipids and also functions in the cultured transformed cell as an ecto-enzyme which can attack exogenous substrates.

Original languageEnglish (US)
Pages (from-to)555-561
Number of pages7
JournalJournal of Cell Biology
Issue number3
StatePublished - Sep 1 1976

All Science Journal Classification (ASJC) codes

  • Cell Biology


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