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DNA Nanostructure-Programmed Like-Charge Attraction at the Cell-Membrane Interface.

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Scientists discovered how negatively charged DNA nanostructures enter cells. This "like-charge attraction" mechanism, involving caveolin, offers insights into viral entry and designing new nanomedicines.

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Area of Science:

  • Nanotechnology
  • Biophysics
  • Molecular Biology

Background:

  • Cellular entry of anionic (negatively charged) nano-objects like viruses and DNA nanostructures is observed but poorly understood.
  • The negatively charged cell membrane typically repels anionic particles, making their internalization mechanism unclear.

Purpose of the Study:

  • To elucidate the physical mechanism of anionic nano-object internalization across negatively charged cell membranes.
  • To program "like-charge attraction" using virus-mimicking DNA nanostructures.

Main Methods:

  • Utilized virus-mimicking designer DNA nanostructures with near-atomic resolution.
  • Employed single-particle tracking to observe cellular internalization.
  • Integrated simulation and experimental data.

Main Results:

  • Tetrahedral DNA nanostructures (TDNs) internalize via a lipid-raft-mediated pathway involving caveolin.
  • Caveolin facilitates short-range attraction at the membrane interface.
  • TDNs approach the membrane at their corners to minimize electrostatic repulsion.
  • TDNs induce charge redistribution in the membrane under caveolin confinement.

Conclusions:

  • A nanoscale "like-charge attraction" mechanism explains anionic nano-object cell entry.
  • This mechanism provides insights into viral entry processes.
  • Findings offer general rules for designing anionic nanocarriers for therapeutic applications.