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Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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Published on: January 19, 2016

Monomer-dimer control and crystal engineering in TASPs.

Jon O Freeman1, Michael E P Murphy, John C Sherman

  • 1Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC, V6T 1Z1 Canada.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|July 26, 2012
PubMed
Summary
This summary is machine-generated.

Synthetic proteins called caviteins can form dimers. Researchers found that specific glutamate interactions are key for stabilizing these protein crystals, while histidine interactions influence their solution behavior.

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Area of Science:

  • Protein engineering
  • Biocrystallography
  • Synthetic biology

Background:

  • Template-assembled synthetic proteins (caviteins) exhibit monomer-dimer equilibrium in solution.
  • Previous work demonstrated modulating this equilibrium through sequence design, including histidine metal chelation and disulfide bonds.
  • The forces governing dimeric cavitein crystal nucleation and stabilization remain largely uncharacterized.

Purpose of the Study:

  • To investigate the molecular interactions responsible for dimeric cavitein crystal formation and stabilization.
  • To probe the role of specific amino acid residues in cavitein crystallization.
  • To elucidate the structural basis for histidine-mediated bias towards dimeric forms.

Main Methods:

  • Design and synthesis of glutamine variants of cavitein.
  • Crystallization of cavitein variants.
  • X-ray crystallography to determine the structure of a histidine-modified cavitein.

Main Results:

  • A critical glutamate hydrogen-bonding interaction was identified as essential for crystal nucleation and stabilization.
  • A crystal structure of a cavitein variant (Q4-E3H), designed for dimeric stability via histidine metal coordination, was obtained.
  • The crystal structure revealed a histidine cluster interaction, providing a likely explanation for the observed dimeric preference in solution.

Conclusions:

  • Glutamate hydrogen bonding is a key determinant for dimeric cavitein crystal formation and stability.
  • Histidine-mediated metal coordination can bias caviteins towards a dimeric state, as evidenced by structural analysis.
  • Understanding these interactions advances the design principles for controlling protein self-assembly and stability.