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• W2074555596 endingPage "e17991" @default.
• W2074555596 startingPage "e17991" @default.
• W2074555596 abstract "Toll-like receptor 9 (TLR9) activates the innate immune system in response to oligonucleotides rich in CpG whereas DNA lacking CpG could inhibit its activation. However, the mechanism of how TLR9 interacts with nucleic acid and becomes activated in live cells is not well understood. Here, we report on the successful implementation of single molecule tools, constituting fluorescence correlation/cross-correlation spectroscopy (FCS and FCCS) and photon count histogram (PCH) with fluorescence lifetime imaging (FLIM) to study the interaction of TLR9-GFP with Cy5 labeled oligonucleotide containing CpG or lacking CpG in live HEK 293 cells. Our findings show that i) TLR9 predominantly forms homodimers (80%) before binding to a ligand and further addition of CpG or non CpG DNA does not necessarily increase the proportion of TLR9 dimers, ii) CpG DNA has a lower dissociation constant (62 nM±9 nM) compared to non CpG DNA (153 nM±26 nM) upon binding to TLR9, suggesting that a motif specific binding affinity of TLR9 could be an important factor in instituting a conformational change-dependant activation, and iii) both CpG and non CpG DNA binds to TLR9 with a 1∶2 stoichiometry in vivo. Collectively, through our findings we establish an in vivo model of TLR9 binding and activation by CpG DNA using single molecule fluorescence techniques for single cell studies." @default.
• W2074555596 created "2016-06-24" @default.
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• W2074555596 date "2011-04-04" @default.
• W2074555596 modified "2023-10-16" @default.
• W2074555596 title "Single Molecule In Vivo Analysis of Toll-Like Receptor 9 and CpG DNA Interaction" @default.
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• W2074555596 doi "https://doi.org/10.1371/journal.pone.0017991" @default.
• W2074555596 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3070698" @default.
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• W2074555596 hasPublicationYear "2011" @default.
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