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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 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

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Related Experiment Video

Updated: Mar 30, 2026

A Protocol for Computer-Based Protein Structure and Function Prediction

A Protocol for Computer-Based Protein Structure and Function Prediction

Published on: November 3, 2011

An amino acid code to define a protein's tertiary packing surface.

Keith J Fraga¹, Hyun Joo¹, Jerry Tsai¹

¹Department of Chemistry, University of the Pacific, Stockton, California, 95211.

|November 18, 2015

Summary

This study introduces a knob-socket model to analyze protein tertiary structure, simplifying the understanding of residue packing. It reveals geometric preferences in protein pockets and highlights the role of amino acids in packing specificity.

Keywords:

knob-socket analysis nonspecific protein interactions packing pocket protein packing protein tertiary structure

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Last Updated: Mar 30, 2026

A Protocol for Computer-Based Protein Structure and Function Prediction

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Published on: November 3, 2011

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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

Area of Science:

Structural biology
Computational biology
Biophysics

Background:

Protein tertiary structure is stabilized by specific packing interactions.
Characterizing nonspecific interactions in protein folding remains challenging.
The knob-socket model offers a framework for analyzing residue packing.

Purpose of the Study:

To extend the knob-socket model for classifying residue interactions within protein pockets.
To investigate the geometry and diversity of protein tertiary surfaces.
To develop a simplified vocabulary for protein tertiary packing analysis.

Main Methods:

Classifying knob residue interactions within contiguous sockets (pockets).
Developing a symbolic two-dimensional mapping of pockets.
Analyzing pocket geometry, amino acid composition, and side-chain rotamer preferences.

Main Results:

Pocket geometries can be grouped by shared core structures, indicating ancillary interactions.
A preference for right-handed configurations in alpha-helices and left-handed in beta-sheets was observed.
Nonpolar amino acids are crucial for packing, with hydrophobic knobs preferring to pack into pockets, though without strong selectivity.

Conclusions:

The knob-socket model provides a simplified vocabulary for describing protein tertiary packing.
This approach aids in the analysis, design, and prediction of protein structures.
Understanding pocket geometry and amino acid composition is key to deciphering packing interactions.