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Related Concept Videos

Conservation of Protein Domains Over Different Proteins02:26

Conservation of Protein Domains Over Different Proteins

Protein domains are small structurally independent units that are part of a single amino acid chain.  Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to form...
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.
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.
Protein Organization01:13

Protein Organization

Overview
Protein Organization01:13

Protein Organization

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Structural Protein Function01:56

Structural Protein Function

Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity.  In bones and teeth, it mineralizes to form...

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Investigating Protein Sequence-structure-dynamics Relationships with Bio3D-web
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Identifying structural domains of proteins using clustering.

Howard J Feldman1

  • 1Chemical Computing Group, Inc., Montreal, Quebec, Canada. feldman@chemcomp.com

BMC Bioinformatics
|November 3, 2012
PubMed
Summary

This study introduces a fast, clustering-based method for identifying protein domains in single chains or complexes. The approach effectively segments protein structures, offering a competitive alternative to existing domain identification techniques.

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Area of Science:

  • Structural bioinformatics
  • Computational biology
  • Protein structure analysis

Background:

  • Protein structures are built from reusable functional units called domains.
  • Identifying these domains is crucial for tasks like similarity searching.
  • Existing computational methods often struggle with multi-chain domains.

Purpose of the Study:

  • To develop a novel, versatile method for protein domain identification.
  • To address limitations of current methods, particularly with multi-chain proteins.
  • To provide a fast and simple approach to domain segmentation.

Main Methods:

  • A clustering-based approach using average-linkage clustering.
  • Clustering vectors representing secondary structure elements or buried alpha-carbon positions.
  • Applicable to both individual protein chains and entire protein complexes.

Main Results:

  • The novel method accurately identifies protein domains in single chains and complexes.
  • Achieved 70% agreement with SCOP on a large dataset and 80% on multi-domain proteins.
  • Demonstrated competitive performance compared to more complex existing methods.

Conclusions:

  • Simple methods can be highly effective for protein domain identification.
  • Protein domains are characterized by compact regions with high internal contact density.
  • The point/vector representation liberates domain identification from artificial constraints.