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Conservation of Protein Domains Over Different Proteins02:26

Conservation of Protein Domains Over Different Proteins

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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.
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Optimization of Synthetic Proteins: Identification of Interpositional Dependencies Indicating Structurally and/or Functionally Linked Residues
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Why does the first protein repeat often become the only one?

Simona Manasra1, Andrey V Kajava2

  • 1Institute of Bioengineering, ITMO University, Kronverksky Pr. 49, 197101 Saint Petersburg, Russia.

Journal of Structural Biology
|August 11, 2023
PubMed
Summary
This summary is machine-generated.

The first repeat in tandem repeat proteins often becomes fixed due to its C2 symmetry, which limits further growth and creates new binding sites. This evolutionary stability explains why repeats stop multiplying.

Keywords:
3D structureClassificationEvolutionProtein repeatsSwappingSymmetry

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Area of Science:

  • Protein structure and evolution
  • Molecular biology
  • Biochemistry

Background:

  • Tandem repeat proteins are common, with two similar motifs often appearing consecutively.
  • The evolutionary fixation of the first repeat, despite opportunities for multiplication, remains an open question.

Purpose of the Study:

  • To investigate the structural and functional reasons behind the evolutionary fixation of the first repeat in tandem repeat proteins.
  • To understand the limitations on repeat number expansion in these proteins.

Main Methods:

  • Systematic analysis of protein structure and function.
  • Examination of internal symmetry and secondary structure element interactions.
  • Identification of binding sites within duplicated domains.

Main Results:

  • The majority of repetitive units exhibit two-fold (C2) internal symmetry, creating closed structures.
  • These C2 structures limit the potential for further repeat number increase.
  • Duplicated domains form small molecule binding sites around the C2 symmetry axis.

Conclusions:

  • The C2 symmetry and associated functional site emergence explain the evolutionary fixation of repeats.
  • These proteins are classified as Class IV or V based on repetitive unit size within a broader structural classification.