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The path of the growing peptide chain through the 23S rRNA in the 50S ribosomal subunit; a comparative cross-linking study with three different peptide families.

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  • 1. Max-Planck-Institut für Molekulare Genetik, AG-Ribosomen, Ihnestrasse 73, 14195 Berlin, Germany.
      Authors
    • Choi KM 1
    (1 author)

Nucleic Acids Research, 01 Feb 1998, 26(4):887-895
https://doi.org/10.1093/nar/26.4.887 PMID: 9461444 PMCID: PMC147335

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Abstract 

As part of a programme to investigate the path of the nascent peptide through the large ribosomal subunit, peptides of different lengths (up to 30 amino acids), corresponding to the signal peptide sequence and N-terminal region of the Escherichia coli ompA protein, were synthesized in situ on E.coli ribosomes. The peptides each carried a diazirine moiety attached to their N-terminus which, after peptide synthesis, was photoactivated so as to induce cross-links to the 23S rRNA. The results showed that, with increasing length, the peptides became progressively cross-linked to sites in Domains V, II, III and I of the 23S rRNA, in a similar manner to that previously observed with a family of peptides derived from the tetracycline resistance gene. However, the cross-links to Domain III appeared at a shorter peptide length (12 aa) in the case of the ompA sequence, and an additional cross-link in Domain II (localized to nt 780-835) was also observed from this peptide. As with the tetracycline resistance sequence, peptides of all lengths were still able to form cross-links from their N-termini to the peptidyl transferase centre in Domain V. A further set of peptides (30 or 50 aa long), derived from mutants of the bacteriophage T4 gene 60 sequence, did not show the cross-links to Domain III, but their N-termini were nevertheless cross-linked to Domain I and to the sites in Domains II and V. The ability of relatively long peptides to fold back towards the peptidyl transferase centre thus appears to be a general phenomenon.

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Nucleic Acids Res. 1998 Feb 15; 26(4): 887–895.
PMCID: PMC147335
PMID: 9461444

The path of the growing peptide chain through the 23S rRNA in the 50S ribosomal subunit; a comparative cross-linking study with three different peptide families.

K M Choi and R Brimacombe
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Abstract

As part of a programme to investigate the path of the nascent peptide through the large ribosomal subunit, peptides of different lengths (up to 30 amino acids), corresponding to the signal peptide sequence and N-terminal region of the Escherichia coli ompA protein, were synthesized in situ on E.coli ribosomes. The peptides each carried a diazirine moiety attached to their N-terminus which, after peptide synthesis, was photoactivated so as to induce cross-links to the 23S rRNA. The results showed that, with increasing length, the peptides became progressively cross-linked to sites in Domains V, II, III and I of the 23S rRNA, in a similar manner to that previously observed with a family of peptides derived from the tetracycline resistance gene. However, the cross-links to Domain III appeared at a shorter peptide length (12 aa) in the case of the ompA sequence, and an additional cross-link in Domain II (localized to nt 780-835) was also observed from this peptide. As with the tetracycline resistance sequence, peptides of all lengths were still able to form cross-links from their N-termini to the peptidyl transferase centre in Domain V. A further set of peptides (30 or 50 aa long), derived from mutants of the bacteriophage T4 gene 60 sequence, did not show the cross-links to Domain III, but their N-termini were nevertheless cross-linked to Domain I and to the sites in Domains II and V. The ability of relatively long peptides to fold back towards the peptidyl transferase centre thus appears to be a general phenomenon.

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Selected References

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