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Polymer biomolecule hybrids represent a powerful class of highly customizable nanomaterials. Here, we report star-polymer conjugates with DNA using a "ligandless" Cu(I) promoted azide-alkyne cycloaddition click reaction. The multivalency of the star-polymer architecture allows for the concomitant conjugation of other molecules along with the DNA, and the conjugation method provides control over the DNA orientation. The star-polymer DNA nanoparticles are shown to assemble into higher-order nanoassemblies through hybridization. Further, we show that the DNA strands can be utilized in controlled disassembly of the nanostructures.
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http://dx.doi.org/10.1021/bc200240q | DOI Listing |
ACS Synth Biol
September 2025
Department of BioSciences, Rice University, MS-140, 6100 Main Street, Houston, Texas 77005, United States.
Microbes can be programmed to record participation in gene transfer by coding biological-recording devices into mobile DNA. Upon DNA uptake, these devices transcribe a catalytic RNA (cat-RNA) that binds to conserved sequences within ribosomal RNAs (rRNAs) and perform a trans-splicing reaction that adds a barcode to the rRNAs. Existing cat-RNA designs were generated to be broad-host range, providing no control over the organisms that were barcoded.
View Article and Find Full Text PDFNucleic Acids Res
September 2025
Key Laboratory of Clinical Laboratory Diagnostics (Chinese Ministry of Education), College of Laboratory Medicine, Chongqing Medical University, Chongqing 400016, P. R. China.
Local pH variations play a pivotal role in numerous critical biological processes. However, achieving the tunability and selectivity of pH detection remains a challenge. Here, we present a DNA-based strategy that enables programmable and selective pH responses, which is termed shadow-strand hybridization-actuated displacement engineering (SHADE).
View Article and Find Full Text PDFAdv Sci (Weinh)
September 2025
Cell Biology and Epigenetics, Department of Biology, Technical University of Darmstadt, 64287, Darmstadt, Germany.
Chromatin dynamics play a crucial role in cellular differentiation, yet tools for studying global chromatin mobility in living cells remain limited. Here, a novel probe is developeded for the metabolic labeling of chromatin and tracking its mobility during neural differentiation. The labeling system utilizes a newly developed silicon rhodamine-conjugated deoxycytidine triphosphate (dCTP).
View Article and Find Full Text PDFiScience
September 2025
Victor Chang Cardiac Research Institute, Darlinghurst, NSW 2010, Australia.
5-Ethynyl-2'-deoxyuridine (EdU) has revolutionized DNA replication and cell cycle analyses through fast, efficient click chemistry detection. However, commercial EdU kits suffer from high costs, proprietary formulations, limited antibody multiplexing capabilities, and difficulties with larger biological specimens. Here, we present OpenEMMU (Open-source EdU Multiplexing Methodology for Understanding DNA replication dynamics), an optimized, affordable, and user-friendly click chemistry platform utilizing off-the-shelf reagents.
View Article and Find Full Text PDFBiomed Eng Lett
September 2025
Department of Electrical & Biological Physics, Kwangwoon University, Seoul, 01897 Republic of Korea.
Purpose: This study investigates the antibacterial and anticancer activity of previously reported iron oxide (FeO)-based nanoparticles (NPs) conjugated with chlorin e6 and folic acid (FCF) in photodynamic therapy (PDT) using a human bladder cancer (BC) (T-24) cell line and three bacterial strains.
Method: To investigate the potential applicability of the synthesized NPs as therapeutic agents for image-based photodynamic BC therapy, their photodynamic anticancer activity was analyzed and the mechanisms of cell death in T-24 cells treated with these NPs were assessed qualitatively and quantitatively through atomic absorption spectroscopy, fluorescence imaging, and transmission electron microscopy.
Results: The effective localization of FCF NPs in T-24 cells were confirmed, validating their excellent cellular fluorescence and magnetic resonance imaging capabilities.