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Protein Folding

Protein Folding

Protein Folding

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 Modifications in the RER

Protein Modifications in the RER

Modification of secretory and transmembrane proteins entering the rough ER begins in the ER lumen. These modifications aid in protein folding and stabilize the acquired tertiary structure. Protein modifications in the rough ER co-occur at different stages of protein folding.
Broadly, these modifications can be categorized into four main categories — glycosylation, formation of disulfide bonds, assembly of protein subunits, and specific proteolytic cleavages like removal of signal sequences.

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 can...

Sulfur Assimilation

Sulfur Assimilation

Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to become...

Amino acids

Amino acids

Amino acids are the monomers that comprise proteins. Each amino acid has the same fundamental structure, which consists of a central carbon atom, or the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom. Every amino acid also has another atom or group of atoms bonded to the central atom known as the R group. There are 20 common amino acids present in proteins, each with a different R group. Variation in the amino acid sequence is responsible for...

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Related Experiment Video

Updated: Jun 6, 2026

Synthesis and Structure Determination of µ-Conotoxin PIIIA Isomers with Different Disulfide Connectivities

Synthesis and Structure Determination of µ-Conotoxin PIIIA Isomers with Different Disulfide Connectivities

Published on: October 2, 2018

Amino acid patterns around disulfide bonds.

José R F Marques¹, Rute R da Fonseca, Brett Drury

¹REQUIMTE/Departamento de Química e Bioquímica, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal;

International Journal of Molecular Sciences

|December 15, 2010

Summary

Disulfide bonds in proteins reveal evolutionary and specificity insights. Analysis shows specific amino acid patterns around these bonds, aiding in protein superfamily classification and relationship assessment.

Keywords:

classification disulfide bond diversity frequency neighborhood

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Production of Disulfide-stabilized Transmembrane Peptide Complexes for Structural Studies

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Last Updated: Jun 6, 2026

Synthesis and Structure Determination of µ-Conotoxin PIIIA Isomers with Different Disulfide Connectivities

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Published on: October 2, 2018

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

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Production of Disulfide-stabilized Transmembrane Peptide Complexes for Structural Studies

Production of Disulfide-stabilized Transmembrane Peptide Complexes for Structural Studies

Published on: March 6, 2013

Area of Science:

Biochemistry
Molecular Biology
Bioinformatics

Background:

Disulfide bonds are crucial for protein structure, stability, and function.
They offer valuable insights into molecular evolution and biological specificity.
Understanding the amino acid microenvironment of disulfide bonds is key to deciphering protein relationships.

Purpose of the Study:

To analyze the amino acid composition surrounding disulfide bonds in disulfide-rich proteins.
To identify patterns and descriptors for these amino acid environments.
To explore the potential of this information for classifying protein superfamilies and assessing evolutionary relationships.

Main Methods:

Statistical analysis using ANOVA and Scheffé methods.
Examination of amino acid composition around disulfide bonds in various protein sets.
Clustering of proteins based on the identified amino acid environment descriptors.

Main Results:

Weakly hydrophilic and aromatic amino acids are enriched near disulfide bonds, while aliphatic and hydrophobic amino acids are less common.
Density distributions of amino acids around disulfide bonds exhibit a unimodal behavior with maxima at intermediate distances.
Distinct amino acid environments around disulfide bonds were observed for different protein superfamilies.

Conclusions:

The amino acid composition around disulfide bonds provides a unique chemical signature for protein superfamilies.
This information can be utilized to cluster disulfide-rich proteins in a biologically meaningful manner.
The study suggests a novel approach for assessing evolutionary relationships among divergent disulfide-rich protein sets.