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Protein Organization

Protein Organization

Protein Organization

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 Organization

Protein Organization

Protein Organization

Protein Organization

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...

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Related Experiment Video

Updated: Apr 3, 2026

Combining Wet and Dry Lab Techniques to Guide the Crystallization of Large Coiled-coil Containing Proteins

Combining Wet and Dry Lab Techniques to Guide the Crystallization of Large Coiled-coil Containing Proteins

Published on: January 6, 2017

Coiled-coil length: Size does matter.

Jaroslaw Surkont¹, Yoan Diekmann^1,2, Pearl V Ryder^2,3

¹Instituto Gulbenkian de Ciência, Oeiras, 2780-156, Portugal.

|September 22, 2015

Summary

This summary is machine-generated.

Protein coiled-coil domains, despite repetitive sequences, maintain a conserved length across species. This suggests functional constraints drive the conservation of their physical size, not just amino acid sequence.

Keywords:

indel protein domain protein evolution protein size sequence repeats

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Area of Science:

Evolutionary biology
Molecular biology
Structural biology

Background:

Protein length evolution involves insertions, deletions, and duplications, balancing stability, function, and metabolic cost.
Sequence variation is common, but length conservation varies across protein regions.
Repetitive peptide motifs often exhibit length heterogeneity.

Purpose of the Study:

To investigate the length conservation of coiled-coil domains, which are ubiquitous and structurally important.
To determine if the repetitive nature of coiled-coils leads to length variation or conservation.

Main Methods:

Analysis of coiled-coil domain length across diverse species.
Comparison of coiled-coil length conservation with other protein regions, including globular domains.

Main Results:

Coiled-coil domains demonstrate high length conservation throughout the tree of life.
This conservation persists even when adjacent protein regions, like globular domains, vary in length.
Length conservation is independent of primary amino acid sequence variation.

Conclusions:

The physical size of coiled-coil domains is functionally constrained.
Functional requirements, rather than just sequence, appear to dictate the conserved length of these structural domains.