Cited by 39Heat shock proteins researchBacterial Genetics and BiotechnologyUbiquitin and proteasome pathways

Protein quality control and regulated proteolysis in the genome‐reduced organism Mycoplasma pneumoniae

Open access
Burgos, Raul, Weber, Marc, Martinez, Sira, Lluch‐Senar, Maria, Serrano, Luis·2020·Molecular Systems Biology

Abstract

Protein degradation is a crucial cellular process in all‐living systems. Here, using Mycoplasma pneumoniae as a model organism, we defined the minimal protein degradation machinery required to maintain proteome homeostasis. Then, we conditionally depleted the two essential ATP‐dependent proteases. Whereas depletion of Lon results in increased protein aggregation and decreased heat tolerance, FtsH depletion induces cell membrane damage, suggesting a role in quality control of membrane proteins. An integrative comparative study combining shotgun proteomics and RNA‐seq revealed 62 and 34 candidate substrates, respectively. Cellular localization of substrates and epistasis studies supports separate functions for Lon and FtsH. Protein half‐life measurements also suggest a role for Lon‐modulated protein decay. Lon plays a key role in protein quality control, degrading misfolded proteins and those not assembled into functional complexes. We propose that regulating complex assembly and degradation of isolated proteins is a mechanism that coordinates important cellular processes like cell division. Finally, by considering the entire set of proteases and chaperones, we provide a fully integrated view of how a minimal cell regulates protein folding and degradation.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.15252/msb.20209530

Cites

101 of 101 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • SynWiki interactomics data shows interactions of /0520 orthologues with the membrane protease lon/0394.

    “Experimentally determined interactomics data reported in SynWiki10 shows interactions of /0520 orthologues with the membrane protease lon/0394”

    From Toward the Complete Functional Characterization of a Minimal Bacterial Proteome (2022) · cites this paper as [71]

    The Results section on Lon and FtsH candidate substrates (page unavailable) discusses Lon substrates and describes Lon as cytoplasmic, but does not report SynWiki interactomics data or interactions involving /0520 orthologues and lon/0394. Searches for SynWiki, /0520 and /0394 found no passage addressing the claimed interaction. (LLM, conf=0.76)

    Experimental — accuracy not yet measured

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

1 of the 102 references couldn’t be matched to a known paper.

Research works printed but not linked: 1

  1. Perkins DN, Pappin DJ, Creasy DM, Cottrell JS (1999) Probability‐based protein identification by searching sequence databases using mass spectrometry data. Electrophoresis 20: 3551– 3567 10612281

Cited by

Sorted by citations

Authors
Burgos, R., Weber, M., Martinez, S., Lluch‐Senar, M., & Serrano, L.
Affiliations
  • Barcelona Institute of Science and Technology (ES)
  • Institució Catalana de Recerca i Estudis Avançats (ES)
Corresponding author
Serrano, Luis
Venue
Molecular Systems Biology
Published
2020-12-01
Volume
16
Issue
12
Pages
e9530-e9530
ISSN
1744-4292 (ISSN-L)
OpenAlex
W3112326989
Cited by
39
References
102
Citations by year
2026: 6 · 2025: 12 · 2024: 4 · 2023: 7 · 2022: 5 · 2021: 4 · 2020: 1
FWCI
1.38
Type
journal article
Language
en
Open access
Locations
  • Molecular Systems Biology (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Repositori digital de la UPF (Universitat Pompeu Fabra) (submittedVersion, cc-by)
Funders
  • H2020 European Research Council (670216)
  • Horizon 2020 Framework Programme (634942)
  • Institució Catalana de Recerca i Estudis Avançats
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heat shock proteins research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
Keywords
protein quality control, regulated proteolysis, Mycoplasma pneumoniae, Lon protease, FtsH protease, ATP-dependent protease, protein aggregation, heat tolerance, membrane protein degradation, protein half-life, protein folding, molecular chaperones, protease substrates, genome reduction
MeSH terms
Amino Acid Sequence, Bacterial Proteins, Models, Biological, Mutation, Mycoplasma pneumoniae, Peptide Hydrolases, Phenotype, Quality Control, Substrate Specificity, Transcription, Genetic, Reproducibility of Results, Gene Expression Regulation, Bacterial, Genome, Bacterial, Protein Folding, Proteolysis

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review