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Table 1 Essentiality of ribosomal proteins.

From: The origin of a derived superkingdom: how a gram-positive bacterium crossed the desert to become an archaeon

Species Essential ribosomal proteins P (ribosome is essential) Essential but absent in Archaea P-value
Pseudomonas aeruginosa UCBPP-PA14 32 0.5818 8 0.3373
Escherichia coli MG1655 45 0.8182 10 0.055
Bacillus subtilis 168 51 0.9273 14 0.3263
Mycoplasma pulmonis UAB CTIP 47 0.8545 10 0.0204
Francisella novicida U112 49 0.8909 13 0.2505
Helicobacter pylori 26695 29 0.5273 10 0.8493
Mycoplasma genitalium G37 51 0.9273 14 0.3263
Acinetobacter baylyi ADP1 48 0.8727 11 0.0435
Mycobacterium tuberculosis H37Rv 34 0.6182 4 0.0031
Staphylococcus aureus N315 51 0.9273 14 0.3263
Haemophilus influenzae Rd KW20 39 0.7091 9 0.1546
  1. The essentiality of proteins that would need to be lost in the transition from an extant bacterial ribosome to an archaeal one varies from species to species. M. tuberculosis appears preadapted for the losses that would be necessary in the transition to an archaeon.