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Protein Organization01:13

Protein Organization

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Protein and Protein Structure02:15

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.
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Protein Organization01:13

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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.
The primary structure of a protein is its amino acid sequence.
Protein Organization01:24

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.

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Analyzing and Building Nucleic Acid Structures with 3DNA
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Published on: April 26, 2013

Relating three-dimensional structures to protein networks provides evolutionary insights.

Philip M Kim1, Long J Lu, Yu Xia

  • 1Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06520, USA.

Science (New York, N.Y.)
|December 23, 2006
PubMed
Summary

Protein network studies often overlook structural details. This research uses atomic-resolution data to show that distinct binding interfaces, not just network position, explain protein importance and evolution, revealing new network growth mechanisms.

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Area of Science:

  • Structural biology
  • Systems biology
  • Bioinformatics

Background:

  • Protein-protein interaction (PPI) networks are typically studied at a high level of abstraction.
  • Existing network analyses often neglect the underlying structural and chemical properties of protein interactions.

Purpose of the Study:

  • To characterize protein network interactions using atomic-resolution structural information.
  • To investigate the relationship between network topology, genomic features, and structural properties of protein interactions.

Main Methods:

  • Utilizing atomic-resolution data from three-dimensional protein structures to define protein interactions.
  • Analyzing network topology and correlating it with structural quantities, such as the number of distinct binding interfaces.
  • Examining the evolutionary rates of proteins, particularly network hubs, based on their structural characteristics.

Main Results:

  • The tendency for network hubs to be essential proteins is strongly correlated with the number of distinct binding interfaces, a structural quantity.
  • Subdividing hubs based on the number of binding interfaces reveals insights into their evolutionary rates.
  • The findings suggest that mechanisms beyond preferential attachment through gene duplication contribute to protein network evolution.

Conclusions:

  • Atomic-resolution structural information is crucial for a deeper understanding of protein networks.
  • The number of distinct binding interfaces is a key factor influencing protein essentiality and evolutionary dynamics within networks.
  • Protein network evolution involves multiple mechanisms, including those related to structural interaction properties.