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The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
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Accelerating supramolecular aggregation by molecular sliding.

Wenjing Zhao1, Hongxu Du1, Yijie Xia2

  • 1Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China. xhwan@pku.edu.cn.

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Summary
This summary is machine-generated.

Researchers developed a photoresponsive slider-track system to accelerate self-assembly. This system uses azo sliders and polymer tracks, controllable with UV light, enhancing molecular machine design.

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Area of Science:

  • Supramolecular Chemistry
  • Polymer Science
  • Nanotechnology

Background:

  • Diffusion-based translocation is crucial for genome regulatory proteins to find target sites on DNA/RNA.
  • Proteins can bind targets faster than diffusion-controlled rates due to reduced search dimensionality.

Purpose of the Study:

  • To report a novel photoresponsive slider-track diffusion system.
  • To demonstrate self-assembly rate acceleration using this system.
  • To explore applications in designing molecular machines.

Main Methods:

  • Constructed a system with (-)-camphorsulfonic acid, 4-(4"-n-octoxylphenylazo)benzenesulfonic acid, and isotactic poly(2-vinylpyridine).
  • Utilized protonated pyridine rings as binding sites for anionic azo sliders on polycationic tracks via electrostatic interactions.
  • Triggered trans to cis isomerization and aggregation of azo sliders using ultraviolet light.
  • Monitored system behavior using multiple spectroscopic methods without labeling.

Main Results:

  • The slider-track system demonstrated self-assembly rate acceleration.
  • UV light induced trans to cis isomerization and aggregation of azo sliders.
  • The vinyl polymer track increased the aggregation rate of cis azobenzene up to approximately 20 times.
  • Aggregation rate was influenced by polymer stereoregularity, acid/base ratio, and salt concentration.

Conclusions:

  • The developed system is simple, monitorable, and controllable.
  • This photoresponsive system shows potential for designing molecular machines with specific functions.
  • The acceleration of self-assembly via controlled diffusion offers new avenues in molecular engineering.