Quantitative Mapping of Endosomal DNA Processing by Single Molecule Counting

Ved Prakash, Konstantinos Tsekouras, Muthukumaran Venkatachalapathy, Laurie Heinicke, Steve Presse, Nils G. Walter, Yamuna Krishnan

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

Extracellular DNA is engulfed by innate immune cells and digested by endosomal DNase II to generate an immune response. Quantitative information on endosomal stage-specific cargo processing is a critical parameter to predict and model the innate immune response. Biochemical assays quantify endosomal processing but lack organelle-specific information, while fluorescence microscopy has provided the latter without the former. Herein, we report a single molecule counting method based on fluorescence imaging that quantitatively maps endosomal processing of cargo DNA in innate immune cells with organelle-specific resolution. Our studies reveal that endosomal DNA degradation occurs mainly in lysosomes and is negligible in late endosomes. This method can be used to study cargo processing in diverse endocytic pathways and measure stage-specific activity of processing factors in endosomes.

Original languageEnglish (US)
Pages (from-to)3073-3076
Number of pages4
JournalAngewandte Chemie - International Edition
Volume58
Issue number10
DOIs
StatePublished - Mar 4 2019

Keywords

  • DNA
  • DNase II
  • lysosomes
  • photobleaching
  • single-molecule counting

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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    Prakash, V., Tsekouras, K., Venkatachalapathy, M., Heinicke, L., Presse, S., Walter, N. G., & Krishnan, Y. (2019). Quantitative Mapping of Endosomal DNA Processing by Single Molecule Counting. Angewandte Chemie - International Edition, 58(10), 3073-3076. https://doi.org/10.1002/anie.201811746