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Related Concept Videos

Conservation of Protein Domains Over Different Proteins02:26

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Demonstration of the Sequence Alignment to Predict Across Species Susceptibility Tool for Rapid Assessment of Protein Conservation
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Proteome-wide structural analysis quantifies structural conservation across distant species.

Shijie Zhang1, Teng Zhang1, Yuan Fu2

  • 1Department of Pharmacology and Tianjin Key Laboratory of Inflammation Biology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin 300070, China.

Genome Research
|November 22, 2023
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Summary
This summary is machine-generated.

Protein structure analysis reveals evolutionary links missed by sequence data. This study characterizes the "twilight zone" of protein evolution, showing structural similarities across species and domains.

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Area of Science:

  • Evolutionary biology
  • Structural biology
  • Genomics

Background:

  • Traditional evolutionary biology relies on sequence data.
  • Protein structure is more conserved and functionally linked than sequence.
  • Limited understanding of evolutionary relationships using structural information.

Purpose of the Study:

  • To perform a proteome-wide structural analysis across three domains of life.
  • To characterize the 'twilight zone' of protein evolution.
  • To investigate evolutionary origins of biological pathways from a structural perspective.

Main Methods:

  • Proteome-wide analysis of experimental and computed protein structures.
  • Comparison of structural similarity and sequence identity across species.
  • Analysis of homologous protein pairs in the twilight zone.

Main Results:

  • Structurally similar homologous protein pairs in the twilight zone represent a significant portion of genes (8-32%).
  • Human energy supply proteins show higher similarity to E. coli homologs.
  • Human central dogma proteins show higher similarity to M. jannaschii homologs.
  • A bacterial GPCR homolog with unique domain architecture was identified in E. coli.

Conclusions:

  • Protein structure provides insights into evolutionary relationships obscured by sequence data.
  • The twilight zone plays a role in protein evolution and homology detection.
  • Structural comparisons reveal distinct evolutionary origins for different cellular pathways.