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Related Concept Videos

Protein Complex Assembly02:41

Protein Complex Assembly

Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...

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Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides
07:26

Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides

Published on: November 21, 2013

Molecular self-assembly into one-dimensional nanostructures.

Liam C Palmer1, Samuel I Stupp

  • 1Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA.

Accounts of Chemical Research
|August 30, 2008
PubMed
Summary
This summary is machine-generated.

Researchers precisely control nanoscale object shape and size using supramolecular chemistry principles. This enables tailored 1D nanostructures for advanced electronic and biological applications.

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Area of Science:

  • Supramolecular chemistry
  • Nanotechnology
  • Materials science

Background:

  • Self-assembly of small molecules into one-dimensional (1D) nanostructures is crucial for developing advanced electronically and biologically active materials.
  • Supramolecular chemistry provides fundamental principles for controlling the size, shape, and internal structure of nanoscale objects.

Purpose of the Study:

  • To demonstrate how supramolecular chemistry principles can be applied to precisely control the self-assembly of molecules into 1D nanostructures.
  • To explore various molecular designs, including dendron rod-coil molecules, peptide lipids, and peptide amphiphiles (PAs), for creating specific nanostructures.
  • To investigate methods for controlling the morphology, helical pitch, and length of self-assembled nanostructures.

Main Methods:

  • Atomic Force Microscopy (AFM) and Transmission Electron Microscopy (TEM) were used to study assembly morphology.
  • Spectroscopic techniques including Circular Dichroism (CD), Nuclear Magnetic Resonance (NMR), Infrared (IR), and Optical Spectroscopy provided molecular-level insights.
  • Synthetic modifications of molecular components (dendron, rod, coil, end groups) were employed to tune self-assembly.
  • Photoisomerization and templating strategies were utilized for dynamic control of nanostructure formation.

Main Results:

  • Dendron rod-coil molecules self-assembled into tunable ribbons and helical structures, influenced by molecular segment lengths and hydrogen bonding.
  • Chiral helices were formed using enantiomerically enriched coil segments.
  • Peptide lipid molecules formed tunable nanofibers, with helical pitch controlled by end-group sterics and photoisomerization.
  • Peptide amphiphiles (PAs) formed quadruple helical fibers that transitioned to cylindrical nanofibers upon photocleavage.
  • A rigid-rod template effectively controlled PA nanofiber length, limiting assembly to below 10 nm.

Conclusions:

  • Precise control over the size, shape, and internal structure of 1D nanostructures is achievable through supramolecular chemistry.
  • Molecular design, including synthetic modifications and the use of specific building blocks, is key to directing self-assembly.
  • External stimuli like light and templating agents offer dynamic control over nanostructure formation and dimensions.
  • These strategies provide a general platform for creating tailored nanostructures for diverse applications in materials science and nanotechnology.