Chemical biology
Phen-DC3 probes that reveal G4 ligand localization
Open access · cc by · source: Europe PMC
A Phen-DC3 handle lets chemists add BODIPY or a cell-penetrating peptide without losing G4 selectivity, showing the parent ligand misses the nucleus.
Study at a glance
- Design
- Animal / in-vitro — Phen-DC3 conjugate synthesis with G4 assays and live-cell imaging in HeLa cells
- N
- Cell-based probe study; no single primary analytic N
- Population
- HeLa cells and in-vitro G4 DNA assays
- Outcome
- G4 stabilization, cellular localization, and mtDNA copy-number effects of Phen-DC3 conjugates
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Key findings
BODIPY–Phen-DC3 still stabilizes G4 DNA over dsDNA but barely kills cells because it fails to enter the nucleus and instead partially localizes to mitochondria, lowering mtDNA copy number. Peptide conjugation keeps G4 selectivity and strongly boosts cellular/nuclear effects.
Methodology
Authors built a Phen-DC3 derivative with a phenanthroline amine handle, conjugated BODIPY or a cell-penetrating peptide, and tested G4 stabilization (Taq stop, FRET, CD/NMR) plus live-cell imaging and mtDNA copy number in HeLa cells.
Limitations
The work does not map which mitochondrial G4 sequences are bound in cells, nor does it prove tissue-selective delivery; viability was measured in HeLa cultures, not in vivo tumors.
How this study connects
Role on claims
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Evidence for the claim as stated.
A Phen-DC3 handle lets chemists add BODIPY or a cell-penetrating peptide without losing G4 selectivity, showing the parent ligand misses the nucleus.
Evidence for the claim as stated.
A binding pose or a DC50 in one cell line is not a drug; off-target proteome labelling varies with the tag.
Evidence for the claim as stated.
Open questions
Tensions this paper is part of
From concept pages' “where studies disagree.” Disagreement means the same question; scope means different assays, populations, or outcomes.
A binding pose or a DC50 in one cell line is not a drug; off-target proteome labelling varies with the tag.
- Supports · PROTAC THNAN69 degrades LIMK2, not LIMK1
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