Cited by 42RNA and protein synthesis mechanismsAntibiotic Resistance in BacteriaBacterial Genetics and Biotechnology

The tetracycline resistance protein Tet(○) perturbs the conformation of the ribosomal decoding centre

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Connell, Sean R., Trieber, Catharine A., Stelzl, Ulrich, Einfeldt, Edda, Taylor, Diane E., Nierhaus, Knud H.·2002·Molecular Microbiology

Abstract

Summary: Tet(○) is an elongation factor‐like protein found in clinical isolates of Campylobacter jejuni that confers resistance to the protein‐synthesis inhibitor tetracycline. Tet(○) interacts with the 70S ribosome and promotes the release of bound tetracycline, however, as shown here, it does not form the same functional interaction with the 30S subunit. Chemical probing demonstrates that Tet(○) changes the reactivity of the 16S rRNA to dimethyl sulphate (DMS). These changes cluster within the decoding site, where C1214 is protected and A1408 is enhanced to DMS reactivity. C1214 is close to, but does not overlap, the primary tetracycline‐binding site, whereas A1408 is in a region distinct from the Tet(○) binding site visualized by cryo‐EM, indicating that Tet(○) induces long‐range rearrangements that may mediate tetracycline resistance. Tetracycline enhances C1054 to DMS modification but this enhancement is inhibited in the presence of Tet(○) unlike the tetracycline‐dependent protection of A892 which is unaffected by Tet(○). C1054 is part of the primary binding site of tetracycline and A892 is part of the secondary binding site. Therefore, the results for the first time demonstrate that the primary tetracycline binding site is correlated with tetracycline's inhibitory effect on protein synthesis.

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Crossref · 10.1046/j.1365-2958.2002.03115.x

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  • The 438-loop is not involved in interactions with Tc and is located about 15 Å away from Tc, but residue 437 is located in the near vicinity of nucleotides 1492-1493 in the 16S rRNA.

    “Unlike the 507-loop, the 438-loop is not involved in the interactions with Tc, located about 15 Å away from Tc, but residue 437 is located in the near vicinity of nucleotides 1492–1493 in the 16S rRNA, where the decoding interaction network is observed in a normal translation ribosome 21.”
  • The bases of nucleotides 1492-1493 in the 16S rRNA flip out toward the Tet(O) 438-loop; this flipped-out conformation was also observed when codon-anticodon recognition takes place in a translating ribosome.

    “In addition, the bases of nts 1492–1493 in the 16S rRNA flip out toward the Tet(O)’s 438-loop (Fig. 3); the flipped-out conformation that was also observed when a codon-anticodon recognition takes place in a translating ribosome 21.”
  • Tet(O) chases tetracyclines from the primary binding site but not the secondary binding site.

    “(vi) Tet(O), an RPP which confers resistance to tetracycline, chases tetracyclines from the primary binding site but not the secondary binding site (12).”
  • Protection of C1214 from DMS modification indicates that this base is directly shielded by Tet(O), supported by cryo-EM.

    “The protection of C1214 from DMS modification would indicate that this base is directly shielded by Tet(O), and this conclusion is supported by the fact that the Tet(O) binding site observed by cryo-EM approaches C1214 (Fig. 4B).”
  • On the 30S subunit, DMS probing localized Tet(O) interaction sites to h34 (C1214) and h44 (A1408), near the decoding site and the primary tetracycline-binding site.

    “On the 30S subunit, sites of interaction were localized to h34 (C1214) and h44 (A1408), near the decoding site and the primary tetracycline-binding site (Fig. 4).”

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Authors
Connell, S. R., Trieber, C. A., Stelzl, U., Einfeldt, E., Taylor, D. E., & Nierhaus, K. H.
Affiliations
  • University of Alberta (CA)
  • Max Planck Institute for Molecular Genetics (DE)
Corresponding author
Connell, Sean R.
Venue
Molecular Microbiology
Publisher
Wiley
Published
2002-09
Volume
45
Issue
6
Pages
1463-1472
ISSN
  • 0950-382X (ISSN-L)
  • 1365-2958
OpenAlex
W1692011572
Cited by
42
References
46
Citations by year
2026: 1 · 2023: 1 · 2022: 1 · 2020: 1 · 2019: 1 · 2018: 2 · 2016: 1 · 2015: 4 · 2014: 4 · 2013: 1 · 2012: 2
FWCI
0.93
Type
journal article
Language
en
Open access
Locations
  • Molecular Microbiology (publishedVersion)
  • PubMed (publishedVersion)
  • Max Planck Institute for Plasma Physics (submittedVersion)
  • MPG.PuRe (Max Planck Society) (submittedVersion)
Funders
  • Deutsche Forschungsgemeinschaft
  • Alberta Heritage Foundation for Medical Research
  • Natural Sciences and Engineering Research Council of Canada
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Medicine › Antibiotic Resistance in Bacteria
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
Keywords
tetracycline resistance, Campylobacter jejuni, 16S rRNA, 30S ribosomal subunit, protein synthesis inhibition
MeSH terms
Bacterial Proteins, Binding Sites, Carrier Proteins, Models, Molecular, Molecular Conformation, Ribosomes, RNA, Ribosomal, 16S, Tetracycline Resistance, Protein Biosynthesis, Campylobacter jejuni

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