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Related Concept Videos

Assembly of Cytoskeletal Filaments01:18

Assembly of Cytoskeletal Filaments

Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
The Structure of Intermediate Filaments01:19

The Structure of Intermediate Filaments

The intermediate filaments are one of three widely studied cytoskeletal filaments. They are so named as their diameter (10 nm) is in between that of microfilaments (7 nm) and the microtubules (25 nm).  These filaments are highly stable and can remain intact when exposed to high salt concentrations and detergents. These filaments are responsible for providing stability and mechanical support to the cells. They also help in cell adhesion and maintaining tissue integrity.
Intermediate filaments...
Formation of Intermediate Filaments00:57

Formation of Intermediate Filaments

Intermediate filaments are cytoskeletal proteins with higher tensile strength and flexibility than microfilaments and microtubules. Unlike the other two cytoskeletal proteins, intermediate filament formation lacks the enzymatic activity to hydrolyze nucleotides like ATP and GTP to generate energy for polymerization. Therefore, the formation of intermediate filaments is multistep self-assembly. The involvement of any accessory proteins in intermediate filament formation has not yet been reported.
Self-Locking Screw01:16

Self-Locking Screw

A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. One of the key features that can make a screw jack more effective and reliable is its self-locking capability.
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Fimbriae, Pili, and Axial Filaments01:28

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Fimbriae and pili are specialized bacterial surface structures that play pivotal roles in adhesion, genetic exchange, and motility. Composed primarily of pilin protein, these hairlike appendages are crucial for bacterial survival and pathogenicity in various environments.Fimbriae: Adhesion and PathogenicityFimbriae are fine, filamentous structures measuring 2–10 nanometers in diameter and are densely distributed on the bacterial cell surface. They facilitate bacterial adhesion to abiotic...

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DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers
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Published on: October 25, 2017

Interlocked chiral nanotubes assembled from quintuple helices.

Yong Cui1, Suk Joong Lee, Wenbin Lin

  • 1Department of Chemistry, CB #3290, University of North Carolina, Chapel Hill 27599, USA.

Journal of the American Chemical Society
|June 6, 2003
PubMed
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Researchers created novel homochiral helical chains that self-assemble into nanotubes. These chiral nanotubes exhibit high affinity for aromatic molecules and can be functionalized for enantioselective applications.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Development of chiral supramolecular structures is crucial for advanced materials.
  • Homochiral helical assemblies offer unique structural and functional properties.

Purpose of the Study:

  • To synthesize and characterize novel homochiral helical chains.
  • To explore the self-assembly of these chains into nanotubular architectures.
  • To investigate the potential of these nanotubes in molecular recognition and separation.

Main Methods:

  • Rational synthesis of C2-symmetric 1,1-binaphthyl-6,6'-bipyridine ligands.
  • Coordination with Ni(acac)2 to form homochiral helical chains.
  • Observation of self-assembly into parallel-associated nanotubes.
  • Incorporation of chiral crown ethers into nanotube walls.

Main Results:

  • Successful synthesis of homochiral helical chains.
  • Formation of 2 x 2 nm nanotubes through parallel association.
  • Intertwining of nanotubes into ordered, interlocked architectures with nanometer-scale channels.
  • Demonstrated high affinity of nanotubes for aromatic molecules.
  • Successful incorporation of chiral crown ethers.

Conclusions:

  • Novel homochiral helical nanotubes with defined dimensions and channels were synthesized.
  • These nanotubular architectures exhibit selective binding of aromatic molecules.
  • The incorporation of chiral crown ethers opens possibilities for novel chiral zeolitic materials for enantioselective processes.