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Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
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Stability of Substituted Cyclohexanes

This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
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Carbocations

Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...
Noncovalent Attractions in Biomolecules02:35

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Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds
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Positional effects of click cyclization on β-hairpin structure, stability, and function.

Jessica H Park1, Marcey L Waters

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

Organic & Biomolecular Chemistry
|October 16, 2012
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Copper(I)-assisted azide-alkyne cycloaddition (CuAAC) effectively stabilizes β-hairpin structures. Cyclic peptides show enhanced stability and retain function, offering potential for inhibiting molecular interactions.

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Area of Science:

  • Biochemistry
  • Chemical Biology
  • Peptide Chemistry

Background:

  • β-hairpins are crucial protein secondary structures.
  • Stabilizing β-hairpins can modulate protein function.
  • Copper(I)-assisted azide-alkyne cycloaddition (CuAAC) is a versatile click chemistry reaction.

Purpose of the Study:

  • To investigate CuAAC for β-hairpin stabilization at various positions.
  • To assess the impact of CuAAC on hairpin structure, stability, and function.
  • To explore the influence of turn sequence and azide chain length.

Main Methods:

  • Synthesis of cyclic β-hairpin peptides using CuAAC.
  • Structural analysis of modified peptides.
  • Thermal stability assays (e.g., melting temperature).
  • Proteolysis resistance assays.
  • Binding affinity studies (e.g., for ATP).

Main Results:

  • CuAAC successfully stabilized β-hairpin structures, particularly with type I' (VNGO) and type II' (VpGO) turns.
  • Cyclic peptides demonstrated improved thermal stability and resistance to proteolysis compared to linear counterparts.
  • Peptide function, assessed by ATP binding affinity, remained unaltered after cyclization.
  • Stabilization was effective regardless of the cyclization site within the peptide strand.

Conclusions:

  • CuAAC is a robust method for creating conformationally constrained β-hairpins.
  • Stabilized β-hairpins maintain their biological function.
  • This approach holds promise for developing inhibitors of protein-protein and protein-nucleic acid interactions.