Single cell studies of enzymatic hydrolysis of a tetramethylrhodamine labeled triglucoside in yeast

X. Chris Le, Woei Tan, Christine H. Scaman, Adam Szpacenko, Edgar Arriaga, Yanni Zhang, Norman J. Dovichi, Ole Hindsgaul, Monica M. Palcic

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35 Scopus citations

Abstract

Several hundred molecules of enzyme reaction products were detected in a single spheroplast from yeast cells incubated with a tetramethylrhodamine (TMR) labeled triglucoside, α-D-Glc(1→2)α-D-Glc(1→3)α-D-Glc-O(CH2)8CONHCH2-CH2NH-COTMR. Product detection was accomplished using capillary electrophoresis and laser induced fluorescence following the introduction of a single spheroplast into the separation capillary. The in vivo enzymatic hydrolysis of the TMR-trisaccharide involves at least two enzymes, limited by processing α-glucosidase I, producing TMR-disaccharide, TMR-monosaccharide, and the free TMR-linking arm. Hydrolysis was reduced by preincubation of the cells with the processing enzyme inhibitor castanospermine. Confocal laser scanning microscopy studies confirmed the uptake and internalization of fluorescent substrate. This single cell analysis methodology can be applied for the in vivo assay of any enzyme with a fluorescent substrate.

Original languageEnglish (US)
Pages (from-to)219-225
Number of pages7
JournalGlycobiology
Volume9
Issue number3
DOIs
StatePublished - Mar 1999

Keywords

  • Capillary electrophoresis
  • In vivo hydrolysis
  • Laser induced fluorescence
  • Spheroplast single cell analysis
  • α-glucosidase

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    Le, X. C., Tan, W., Scaman, C. H., Szpacenko, A., Arriaga, E., Zhang, Y., Dovichi, N. J., Hindsgaul, O., & Palcic, M. M. (1999). Single cell studies of enzymatic hydrolysis of a tetramethylrhodamine labeled triglucoside in yeast. Glycobiology, 9(3), 219-225. https://doi.org/10.1093/glycob/9.3.219