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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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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
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Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as conformers.

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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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Dynamic multicomponent hemiaminal assembly.

Lei You1, S Reid Long, Vincent M Lynch

  • 1Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, TX 78712, USA.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|September 16, 2011
PubMed
Summary
This summary is machine-generated.

Researchers developed a straightforward method for creating metal-templated multicomponent assemblies using di-(2-picolyl)amine and aldehydes. Zinc ions and 2-picolinaldehyde proved most effective, showing promise for molecular recognition and sensing applications.

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Multicomponent assemblies offer versatile platforms for molecular recognition and sensing.
  • Tris-(2-picolyl)amine (TPA) and its analogues are important ligands in coordination chemistry.
  • Developing simple and efficient methods for constructing such assemblies is crucial.

Purpose of the Study:

  • To report a simple approach for in situ generation of metal-templated multicomponent assemblies.
  • To investigate the use of di-(2-picolyl)amine and aldehydes for reversible covalent assembly.
  • To explore potential applications in molecular recognition and sensing.

Main Methods:

  • Utilized reversible covalent association between di-(2-picolyl)amine and aldehydes.
  • Screened various metal salts and heterocyclic aldehydes to identify optimal components.
  • Employed X-ray structural analysis to determine the geometry of the assembled metal complex.
  • Measured equilibrium constants to quantify assembly stability.

Main Results:

  • Identified zinc ions as the most effective metal for inducing assembly.
  • Determined 2-picolinaldehyde as the optimal heterocyclic aldehyde.
  • Observed trigonal-bipyramidal geometry for zinc within the assembled ligand.
  • Quantified assembly equilibrium constants, with one system showing a high value (6.6×10^3 M⁻¹).

Conclusions:

  • A simple and effective method for generating metal-templated multicomponent assemblies was established.
  • The assemblies exhibit tunable diversity and equilibrium by altering reaction conditions or components.
  • These findings open avenues for designing novel molecular recognition and sensing materials.