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On the statistical significance of homologous structures among the Escherichia coli ribosomal proteins

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Summary

Completion of the sequence determination of all 52 Escherichia coli ribosomal proteins enabled a final comparison of their sequences. Similarities in amino acid compositions were compared to the relatedness of the sequences, which was analyzed statistically with the aid of the computer programs RELATE and ALIGN.

Among the examined 52×52 possible protein pairs at least 40 pairs were found that can be regarded as distantly related (showing segment comparison score values slightly above 3.0 S.D. units). These protein pairs were further examined with the programs ALIGN and SEEK to locate homologous sequence stretches. In no case were two complete homologous sequences found (with the exception of the known identical pairs L7/L12 and S20/L26). However, short homologous sequence regions were observed. Beside those protein pairs that show significant although distant relatedness, other pairs were slightly below the threshold value of 3.0 S.D. units.

Those pairs observed to be distantly related consisted either of two proteins from the same subunit or of one protein from each of the different subunits. A further analysis of these pairs revealed a correlation between their relatedness and their time of incorporation into the ribosome during assembly.

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Correspondence to Brigitte Wittmann-Liebold.

Additional information

Communicated by A. Böck

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Wittmann-Liebold, B., Ashman, K. & Dzionara, M. On the statistical significance of homologous structures among the Escherichia coli ribosomal proteins. Molec. Gen. Genet. 196, 439–448 (1984). https://doi.org/10.1007/BF00436191

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Keywords

  • Escherichia Coli
  • Acid Composition
  • Computer Program
  • Homologous Sequence
  • Ribosomal Protein