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Related Concept Videos

Protein Organization01:24

Protein Organization

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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.
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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.
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A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
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Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
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Related Experiment Video

Updated: Jan 10, 2026

Author Spotlight: In Silico Creation and Impact of Carbonylated Amino Acids on Protein Structure and Function
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Author Spotlight: In Silico Creation and Impact of Carbonylated Amino Acids on Protein Structure and Function

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Atom-level backbone engineering preserves peptide function while enhancing stability.

Mingzhu He1, Kai Fan Cheng1, Anh Vu2

  • 1The Feinstein Institutes for Medical Research, Northwell Health, Manhasset, NY, USA.

Biorxiv : the Preprint Server for Biology
|November 24, 2025
PubMed
Summary
This summary is machine-generated.

Backbone engineering enhances peptide stability, but strategies vary. Azapeptides offer a promising approach, maintaining function and improving stability for therapeutic peptide design.

Keywords:
BiochemistrySPPSazapeptidebackbone engineeringchemistrypeptide designpeptide therapeutics

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Area of Science:

  • Medicinal Chemistry
  • Pharmacology
  • Biochemistry

Background:

  • Peptide therapeutics demonstrate high potency and selectivity.
  • Rapid proteolysis and poor pharmacokinetics limit peptide drug development.
  • Backbone engineering is a strategy to improve peptide stability and function.

Purpose of the Study:

  • To systematically compare four backbone modification strategies for peptide enhancement.
  • To evaluate the impact of modifications on synthesis, conformation, stability, and pharmacology.
  • To identify optimal strategies for peptide therapeutic design.

Main Methods:

  • Systematic evaluation of four backbone modifications (D-amino acid, N-methylation, α-methylation, azapeptide) using bradykinin as a model.
  • Assessment of synthesis, conformational changes, proteolytic stability, and receptor pharmacology.
  • In vivo functional assays to determine therapeutic potential.

Main Results:

  • D-amino acid and N-methyl substitutions increased stability but reduced receptor binding and in vivo function.
  • α-methylation also impacted native peptide characteristics.
  • Azapeptide incorporation enhanced stability while preserving native-like receptor affinity and physiological activity.

Conclusions:

  • Balancing peptide stability and function is crucial for therapeutic development.
  • Azapeptides represent an underexplored class of peptide therapeutics with significant potential.
  • This study provides a framework for systematic peptide design and optimization.