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Related Concept Videos

Protein Organization01:24

Protein Organization

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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....
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Protein Organization01:13

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Protein and Protein Structure02:15

Protein and Protein Structure

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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 Folding01:22

Protein Folding

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Protein Folding01:25

Protein Folding

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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
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Protein Families02:47

Protein Families

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Protein families are groups of homologous proteins; that is, they have similarities in amino acid sequences and three-dimensional structures. Protein families usually occur because of gene duplication, where an additional copy of a gene is inserted into the genome of an organism.   Mutations that change the amino acids but still allow the protein to be properly synthesized, will lead to new protein family members.   If these new proteins contain similar amino acids in key...
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Updated: Oct 25, 2025

Creating and Applying a Reference to Facilitate the Discussion and Classification of Proteins in a Diverse Group
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Creating and Applying a Reference to Facilitate the Discussion and Classification of Proteins in a Diverse Group

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Hierarchical Structure of Protein Sequence.

Alexei N Nekrasov1, Yuri P Kozmin1, Sergey V Kozyrev2

  • 1Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, The Russian Academy of Sciences, Miklukho-Maklaya St. 16/10, 117997 Moscow, Russia.

International Journal of Molecular Sciences
|August 7, 2021
PubMed
Summary

This study introduces a novel mathematical method to uncover the hierarchical organization within protein sequences using pentapeptides. This approach reveals structural relationships crucial for understanding protein function and disease.

Keywords:
ANIS methodhierarchyprotein sequenceprotein structuresuper secondary structure

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Area of Science:

  • Biophysics
  • Computational Biology
  • Structural Biology

Background:

  • Non-communicable diseases often stem from protein or protein complex dysfunction.
  • Understanding the relationship between protein sequence, structure, domains, and motifs is a key research area.

Purpose of the Study:

  • To develop and present a novel mathematical method for identifying the hierarchical organization of protein sequences.
  • To analyze the relationship between protein sequence elements and their spatial structure.

Main Methods:

  • A mathematical method was developed utilizing pentapeptides as the fundamental unit of protein sequences.
  • The frequency of pentapeptide occurrences in natural protein sequences was analyzed.
  • The method was applied to a dataset of 24,647 non-homologous protein sequences (50-400 residues) from the NRDB90 database.

Main Results:

  • A hierarchical structure within protein sequences was revealed using the proposed method.
  • Statistical analysis identified 11 characteristic values related to the branching points of sequence graphs.
  • Examples demonstrated correspondence between protein spatial structure fragments and hierarchical sequence elements.

Conclusions:

  • The developed methodology offers a promising foundation for a mathematically-based classification of protein spatial organization.
  • The identified hierarchical elements have potential applications in biotechnology and medicine, aiding in solving complex problems.