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Related Concept Videos

Protein Organization01:13

Protein Organization

Overview
Protein Organization01:24

Protein Organization

Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence.
Protein Folding01:22

Protein Folding

Overview
Protein Folding01:25

Protein Folding

Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
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...
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
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Published on: November 21, 2013

Effect of polypeptide sequence on polypeptide self-assembly.

Bushra Siddique1, Jean Duhamel

  • 1Institute for Polymer Research, Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada.

Langmuir : the ACS Journal of Surfaces and Colloids
|May 6, 2011
PubMed
Summary
This summary is machine-generated.

This study monitored polypeptide self-assembly based on hydrophilic-lipophilic balance (HLB). Higher HLB formed unimolecular micelles, while lower HLB created protective polymeric aggregates for hydrophobic cargo.

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Area of Science:

  • Polymer Chemistry
  • Supramolecular Chemistry
  • Biomaterials Science

Background:

  • Amphiphilic polypeptides are crucial in self-assembly for various applications.
  • Controlling the hydrophilic-lipophilic balance (HLB) is key to tuning self-assembly behavior.
  • Understanding polypeptide self-assembly is vital for designing advanced materials.

Purpose of the Study:

  • To investigate the self-assembly of amphiphilic polypeptides with tunable HLB.
  • To correlate polypeptide sequence and HLB with the resulting self-assembled structures.
  • To elucidate the formation of unimolecular micelles versus polymeric aggregates.

Main Methods:

  • Synthesized a series of (Asp(x)Phe(y))(n) polypeptides with varying HLB.
  • Utilized fluorescence quenching with pyrene to assess probe accessibility.
  • Employed nonradiative energy transfer (NRET) to probe interpolymeric association.
  • Applied dynamic light scattering (DLS) and static light scattering (SLS) to characterize aggregates.

Main Results:

  • Polypeptides with higher aspartic acid (hydrophilic) content formed unimolecular polymeric micelles.
  • Polypeptides with higher phenylalanine (hydrophobic) content formed larger polymeric aggregates (100-200 nm).
  • Fluorescence quenching and NRET confirmed reduced probe exposure in hydrophobic aggregates, indicating solvent protection.

Conclusions:

  • Polypeptide HLB dictates self-assembly into either unimolecular micelles or protective polymeric aggregates.
  • Hydrophilic sequences favor intramolecular self-assembly into micelles.
  • Hydrophobic sequences promote intermolecular aggregation, encapsulating hydrophobic moieties from the solvent.