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Table 3 Distribution of haloarchaeal protein clusters (HOGs) among functional categories†.

From: The core and unique proteins of haloarchaea

  No. of Genomes
  2 3 4 5 6 7 8 9
no COG 1276 650 375 215 164 140 168 89
Information Transfer and Storage 20 13 12 14 10 11 31 217
   Translation, ribosomal structure and biogenesis 2 4 2 2 1 4 10 108
   RNA processing and modification     1     
   Transcription 7 5 4 6 3 5 10 49
   Replication, recombination and repair 11 4 6 5 6 2 11 57
   Chromatin structure and dynamics         3
Cellular Processes and signaling 26 17 18 7 11 15 45 89
   Cell cycle control, cell division, chromosome partitioning 4 1   1   2 3 4
   Defense mechanisms 6 2 2 1   2 1 5
   Signal transduction mechanisms 7 2 7 2 2 2 8 8
   Cell wall/membrane/envelope biogenesis 5 7 3   2 1 11 13
   Cell motility 2 2 3   2 2 12 1
   Intracellular trafficking, secretion, and vesicular transport   1   1   1 6 14
   Posttranslational modification, protein turnover, assembly 2 2 3 2 5 5 4 44
Metabolism 26 28 25 26 57 74 94 283
   Energy production and conversion 3 4 9 6 7 12 20 51
   Carbohydrate transport and metabolism 7   2 5 3 3 12 17
   Amino acid transport and metabolism 7 10 8 5 13 13 12 66
   Nucleotide transport and metabolism 1 2 1 1   3 3 46
   Coenzyme transport and metabolism 2     4 10 24 51
   Lipid transport and metabolism 1 2   2 8 14 9 16
   Inorganic ion transport and metabolism 4 7 3 5 18 16 11 22
   Secondary metabolites biosynthesis, transport and catabolism 1 3 2 2 4 3 3 14
Poorly characterized 18 17 17 20 26 32 52 190
   General function prediction only 11 9 12 16 17 22 36 114
   Function unknown 7 8 5 4 9 10 16 76
  1. †- Several HOGs were associated with one or more COG and all functional categories were tabulated.