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Protein and Protein Structure

Protein and Protein Structure

Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme...

Protein Folding

Protein Folding

Covalently Linked Protein Regulators

Covalently Linked Protein Regulators

Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein....

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Related Experiment Video

Updated: Jun 18, 2025

Combining Non-reducing SDS-PAGE Analysis and Chemical Crosslinking to Detect Multimeric Complexes Stabilized by Disulfide Linkages in Mammalian Cells in Culture

Combining Non-reducing SDS-PAGE Analysis and Chemical Crosslinking to Detect Multimeric Complexes Stabilized by Disulfide Linkages in Mammalian Cells in Culture

Published on: May 2, 2019

Structural Characterization of Disulfide-Linked p53-Derived Peptide Dimers.

Magdalena C DiGiorno¹, Nisansala Vithanage², Clara G Victorio¹

¹Fordham University.

Research Square

|July 29, 2024

Summary

Disulfide bonds drive peptide dimerization, forming stable antiparallel dimers. Amino acid substitutions reveal key residues like leucine and tryptophan that control higher-order structures, enabling tunable molecular architectures for protein targeting.

Keywords:

Dimerization Disulfide Folding Structure

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Area of Science:

Biochemistry and Molecular Biology
Structural Biology
Peptide Chemistry

Background:

Disulfide bonds are crucial for modifying peptide and protein structure and function.
Previous work showed mild oxidation of a p53-derived bisthiol peptide yields exclusive disulfide-linked dimers.

Purpose of the Study:

To investigate intrinsic factors governing peptide dimerization.
To elucidate the structural basis of disulfide-linked peptide oligomerization.
To explore the potential for tunable molecular architectures in peptide design.

Main Methods:

Peptide variant synthesis with amino acid substitutions.
Circular dichroism (CD) spectroscopy for structural analysis.
X-ray crystallography at 1.0 Å resolution for detailed structural determination.

Main Results:

Leucine residues at positions 6 and 10 are critical for stable disulfide-linked dimer formation.
Crystal structure reveals an LxxLL dimer interface with canonical knobs-into-holes packing.
Higher-order oligomers (dimer of dimers, tetramer of dimers) observed, mediated by specific residues (Phe3, Trp7, Leu10).

Conclusions:

Peptide dimerization is intrinsically controlled by specific amino acid residues.
A robust and tunable molecular architecture based on leucine-rich interfaces is demonstrated.
Findings support the development of novel peptide-based strategies for protein targeting and functional modulation.