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The updated Clusters of Orthologous Genes (COG) database now includes over 2,200 prokaryotic genomes, expanding its coverage and enhancing functional annotations. This version improves the study of bacterial protein secretion systems and other key protein families.

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Area of Science:

  • Genomics
  • Bioinformatics
  • Microbiology

Background:

  • The Clusters of Orthologous Genes (COG) database, established in 1997, serves as a crucial resource for comparative genomics.
  • Continuous updates are necessary to incorporate the rapidly expanding number of completely sequenced prokaryotic genomes.

Purpose of the Study:

  • To update the COG database with the latest complete prokaryotic genomes.
  • To expand the COG functional categories, particularly focusing on bacterial protein secretion systems.
  • To improve annotations for various protein families and facilitate comparative genomic analyses.

Main Methods:

  • Inclusion of 2296 complete prokaryotic genomes (2103 bacteria, 193 archaea) from NCBI databases (November 2023).
  • Expansion of COG protein families from 4877 to 4981, with a focus on secretion systems.
  • Improved functional annotations for rRNA/tRNA modification proteins, signal transduction proteins, and uncharacterized families.

Main Results:

  • The COG database now covers 2296 prokaryotic species, representing all genera with complete genomes.
  • New COGs incorporate bacterial secretion systems (Types II-X, Flp/Tad, Type IV pili), enabling lineage-specific analysis.
  • Enhanced annotations provide better insights into prokaryotic functional diversity and evolution.

Conclusions:

  • The updated COG database offers a more comprehensive resource for prokaryotic genomics research.
  • The expanded functional categories, especially for secretion systems, facilitate detailed comparative studies.
  • This resource aids in understanding the distribution and evolution of essential prokaryotic systems.