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Related Experiment Videos

Computer-assisted dissection of rolling circle DNA replication

E V Koonin1, T V Ilyina

  • 1Institute of Microbiology, Academy of Sciences, Moscow, Russia.

Bio Systems
|January 1, 1993
PubMed
Summary
This summary is machine-generated.

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Computer analysis identified a conserved HUH motif in proteins driving rolling circle replication (RCR) and plasmid DNA mobilization. This motif is crucial for DNA cleavage and ligation, revealing evolutionary links across diverse viral and bacterial systems.

Area of Science:

  • Molecular Biology
  • Bioinformatics
  • Virology
  • Microbiology

Background:

  • Rolling circle replication (RCR) is a key process for replicating circular DNA molecules, including plasmids and viral genomes.
  • Proteins involved in RCR and plasmid DNA mobilization share functional similarities but exhibit diverse evolutionary origins.
  • Understanding conserved motifs is crucial for deciphering protein function and evolutionary relationships.

Purpose of the Study:

  • To comparatively analyze proteins involved in the initiation and termination of rolling circle replication (RCR).
  • To identify conserved amino acid motifs shared by RCR and plasmid mobilization proteins.
  • To elucidate the evolutionary relationships between different classes of RCR and mobilization proteins.

Main Methods:

Related Experiment Videos

  • Computer-assisted data screening and analysis.
  • Motif search algorithms applied to protein sequences.
  • Multiple amino acid sequence alignment to identify conserved regions.

Main Results:

  • Two distinct protein classes were identified: those for RCR and those for plasmid DNA mobilization.
  • A conserved 'HUH' motif (His-U-His-U-U-U) was found in both protein classes, potentially involved in metal ion coordination.
  • Replication (Rep) proteins were further classified into superfamilies, revealing evolutionary links between bacteriophages, plasmids, geminiviruses, and parvoviruses.
  • Plasmid mobilization (Mob) proteins showed a distinct arrangement of conserved motifs compared to Rep proteins.

Conclusions:

  • The conserved 'HUH' motif is a hallmark of proteins involved in RCR and DNA mobilization.
  • The study reveals significant evolutionary conservation and relationships between viral and plasmid replication/mobilization proteins.
  • The findings provide insights into the mechanisms of DNA cleavage and ligation mediated by these conserved protein motifs.