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Related Concept Videos

Protein Organization01:13

Protein Organization

Overview
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 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.
A protein's shape is critical to its function. For example, an enzyme can...
Protein Folding01:22

Protein Folding

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Protein Folding01:25

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...
Conserved Binding Sites01:49

Conserved Binding Sites

Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...

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Homepeptide repeats: implications for protein structure, function and evolution.

Muthukumarasamy Uthayakumar1, Bowdadu Benazir, Sanjeev Patra

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Homopeptide repeats in Mycobacterium tuberculosis proteins are crucial for cellular metabolism and protein interactions. These repeats show higher conservation in bacteria and archaea, influencing evolutionary rates and protein evolution.

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Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Bioinformatics

Background:

  • Homopeptide repeat-containing proteins (HRCPs) are found across various organisms.
  • The functional and evolutionary significance of these repeats, particularly in pathogenic bacteria like Mycobacterium tuberculosis, requires further investigation.

Purpose of the Study:

  • To identify and functionally annotate HRCPs in Mycobacterium tuberculosis H37Rv (Mtb H37Rv).
  • To investigate the evolutionary conservation and potential role of homopeptide repeats in protein evolution across different kingdoms.

Main Methods:

  • Bioinformatic analysis of Mtb H37Rv protein sequences to identify HRCPs.
  • Functional annotation of identified HRCPs.
  • Comparative analysis of homopeptide repeat lengths across Bacteria, Archaea, and Eukaryotes.

Main Results:

  • HRCPs in Mtb H37Rv are predominantly involved in cellular metabolism.
  • Homopeptide repeats may play specific roles in protein-protein interactions.
  • Homopeptide repeats exhibit higher conservation in Bacteria and Archaea compared to Eukaryotes.
  • A correlation exists between homopeptide repeat length variation and species divergence.
  • The presence of homopeptide repeats appears to influence the evolutionary rate of protein sequences.

Conclusions:

  • Homopeptide repeats have significant structural, functional, and evolutionary implications for proteins.
  • These repeats are important determinants of protein evolution and function, especially in prokaryotes.